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Dietary supplement

Ginza-Plus Ingredients & Drug Interactions

by Irwin Naturals

Softgel Capsule Category: Other Combinations
Most serious interaction: Moderate
The interaction bottom line Most serious interaction: Moderate

Ginza-Plus is a dietary supplement by Irwin Naturals with 8 active ingredients. Its ingredients are commonly taken for flavoring and culinary use, digestive complaints like bloating and indigestion, boosting absorption of other supplements.Based on those ingredients, 1,458 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Rhodiola (Rhodiola rosea) powder, Asian Ginseng extract, Bioperine Black Pepper extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

HelloPharmacist Scorecard of Ginza-Plus by Irwin Naturals

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

What’s inside

Partial disclosure
Ingredient Transparency · database check
Partial

Most active ingredients list an amount, but at least one is hidden in a blend or missing.

Why this rating?
  • The label discloses an exact amount for 6 of its 8 active ingredients.
  • “BioPerine Complex” is a proprietary blend — the label gives one combined amount (6 mg) without saying how much of each component you get.

Ginza-Plus contains 8 active ingredients: Bioperine black pepper extract, Ginger extract, Fish Oil, Maca powder, Asian Ginseng extract, Rhodiola powder, Schisandra powder, and Cordyceps extract. The product also includes inactive ingredients (gelatin capsule, beeswax, glycerin, soy lecithin, annatto, titanium dioxide, St.

John's Bread, and turmeric) that serve as binders, thickeners, and colorants. The blend combines herbal adaptogens—ginseng, rhodiola, and schisandra—traditionally used for stress and energy, alongside fish oil for omega-3 support, ginger for digestion and inflammation, black pepper to enhance absorption of other compounds, maca for vitality, and cordyceps for stamina.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: stress support and energy with adaptogens.
  • We looked for evidence on: Anxiety, Chronic fatigue syndrome (CFS), Depression, Cognitive function, Athletic performance, stress resilience — and 3 related terms.
  • The strongest evidence on file: Panax Ginseng is rated "Possibly Effective" for Cognitive function (Natural Medicines).
  • Also on file: Panax Ginseng is rated "Possibly Effective" for Multiple sclerosis-related fatigue.
  • Also on file: Cordyceps is rated "Possibly Ineffective" for Athletic performance.

The data we hold shows mixed or limited evidence for most ingredients in Ginza-Plus. Ginger is rated Possibly Effective for pregnancy-related nausea, menstrual pain (dysmenorrhea), and osteoarthritis, but Possibly Ineffective for muscle soreness and chemotherapy nausea.

Fish oil is Effective for high triglycerides and Possibly Effective for heart failure and fatty liver disease. Asian ginseng is Possibly Effective for erectile dysfunction, sexual function, flu, and mental focus.

For black pepper, maca, rhodiola, schisandra, and cordyceps, the evidence is rated Insufficient or the conditions listed are rated Insufficient—meaning we don't yet have enough reliable data to say whether they work. If you're taking Ginza-Plus for a specific health goal, discuss with your doctor or pharmacist whether the research backs its use for your situation.

The evidence, ingredient by ingredient Black Pepper Ginger Fish Oil Maca Panax Ginseng Rhodiola Schisandra Cordyceps

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 8 of the 8 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 8 of 8.
  • General safety write-ups exist for 8 of 8.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Black pepper is generally well tolerated in food amounts, though concentrated supplements warrant caution; common side effects include a burning aftertaste, heartburn, and altered taste. Ginger is generally well tolerated at typical doses, though higher amounts (5 grams daily or more) raise the risk of abdominal discomfort, diarrhea, and heartburn—effects that may lessen with encapsulated forms.

Fish oil is generally well tolerated but can cause fishy aftertaste, loose stools, nausea, and rash; doses above 3 grams daily may increase bleeding risk. Asian ginseng's most common side effect is insomnia, and it carries rare risks of serious reactions.

Rhodiola and schisandra may cause dizziness, dry mouth, appetite changes, or heartburn. Cordyceps is generally well tolerated short-term, though abdominal discomfort and diarrhea have been reported.

For pregnancy and breastfeeding: black pepper and ginger are Likely Safe in typical amounts, though ginger in pregnancy should be discussed with your doctor first. Fish oil is Likely Safe.

Maca, Asian ginseng, rhodiola, schisandra, and cordyceps lack sufficient safety data in pregnancy and breastfeeding—talk with your doctor or pharmacist before use if you are pregnant or nursing.

Side effects, ingredient by ingredient Black Pepper Ginger Fish Oil Maca Panax Ginseng Rhodiola Schisandra Cordyceps

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 7 of the 8 matched ingredients can interact with medications — Schisandra, Cordyceps, Black Pepper, Rhodiola, Ginger, among others.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs; diabetes medications; heart-rhythm medications; lithium.
  • For scale: 1,459 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before taking Ginza-Plus, double-check with your doctor or pharmacist if you take any of these: anti-seizure drugs (phenytoin and others), heart and blood pressure medications (propranolol, nifedipine, losartan, antihypertensives, beta-blockers, ACE inhibitors), blood thinners (warfarin and other anticoagulants or antiplatelets), diabetes medications, psychiatric drugs (MAOIs, selegiline), immunosuppressants (cyclosporine, tacrolimus, sirolimus), and any sedatives or drugs processed by your liver. All carry Moderate interactions with one or more ingredients.

Fish oil and ginger together amplify bleeding risk with anticoagulants.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glancePartially disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Ginza-Plus combines popular herbal and nutritional ingredients, but its black pepper and ginseng content create substantial drug interactions—particularly with seizure, heart, blood pressure, blood-thinning, diabetes, and immune medications. If you take any prescription medications, review them against the interaction checker on this page first.

Generally well tolerated in the short term, though individual ingredients can cause mild digestive upset. Talk with your doctor or pharmacist before starting this product, especially if you're on regular medications or pregnant or breastfeeding.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 8 of 8 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Mar 24, 2016.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Ginza-Plus, straight from the product label.

Brand Irwin Naturals
Barcode (UPC) 710363262396
Net contents 75 Liquid Softgel(s)
Market status On market
Date entered into DSLD Mar 24, 2016
DSLD ID 57350
Product type Other Combinations
Supplement form Softgel Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Ginza-Plus by Irwin Naturals, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
3 Liquid Softgel(s)
Maximum serving Sizes:
3 Liquid Softgel(s)
Servings per container
25
UPC/BARCODE
710363262396
IngredientAmount% DV
Bioperine Black Pepper extract0 NP--
BioPerine Complex6 mg--
Ginger extract0 NP--
Fish Oil1500 mg--
Maca powder500 mg--
Asian Ginseng extract62 mg--
Rhodiola (Rhodiola rosea) powder250 mg--
Schisandra (Schisandra chinensis) powder250 mg--
Cordyceps (Cordyceps sinensis) extract50 mg--

Other ingredients: Gelatin, purified Water, Beeswax, Glycerin, Soy Lecithin, Annatto, Titanium Dioxide, St. John's Bread, Turmeric

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Brand IP Statement(s)

Ginza-Plus combines five of the most highly prized adaptogens in the world.*

Ginza-Plus is specially designed to promote general health and well-being, and is especially suited for individuals who feel depleted due to overwork, excess stress and inadequate rest.*

Quality Assurance - Irwin Naturals is committed to providing the highest quality products for your health.

Patented BioPerine - BioPerine enhances the bioavailability, absorption and potency of many nutrients.*

BioPERINE is a registered trademark of Sabinsa Corporation.

General Statements

Russian scientists coined the term “adaptogen” to describe a special group of botanicals that increase the body’s resistance to physical, mental and environmental stressors.* Adaptogens have a broad influence on the entire body and, among their many properties, have the capacity to balance body functions and support body systems affected by stress.*

Ginseng is traditionally used as a revitalizing tonic for the body and is one of the very best botanicals for increasing feelings of energy and improving mental and physical performance overall, especially under stressful conditions.*

What makes us different: Liquid Soft-Gels - The nutrients in these easy-to-swallow Liquid Soft-Gels are released fast. Other forms of delivery can contain binders and fillers that may cause stomach upset and offer no nutritional value. Advanced Liquid Soft-Gels provide an optimum delivery system.

We employ compliance testing to ensure purity and potency.

Global Responsibility - Over the years we have donated to organizations that support the environment and the health of our children.

QUESTIONS: Call Consumer Affairs 1-800-297-3273 Weekdays 8:00 AM to 5:00 PM (PST)

Endurance ~ Vitality ~ Balance

5 Powerful Adaptogens.

Full Disclosure Ingredient Panel

To join our Wellness Club and receive tips on how to improve your health, please visit us at www.IrwinNaturals.com/wellness1

Formula

The key ingredient in Ginza-Plus is a highly concentrated extract of ginseng root.

Potent Ginseng Extract

Contains: Fish (anchovy, sardine), Soy

Suggested/Recommended/Usage/Directions

It can be used daily for overall support or as needed during times of stress.*

DIRECTIONS: (Adult) Take three (3) Liquid Soft-Gels per day with meals. May be taken all at once or divided throughout the day.

FDA Disclaimer Statement

These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Seals/Symbols

QUALITY TESTED PASS GUARANTEED

Precautions

Usage Warnings: Do not use if safety seal is broken.

This product contains ingredients that may affect blood pressure and/or heart conditions.

Check with your doctor before using this product and engaging in activity, if you are using medication or have any medical conditions, including heart disease or high/low blood pressure.

Not intended for use by persons under 18. KEEP OUT OF REACH OF CHILDREN.

WARNING: (State of California Prop 65) This product contains a chemical known to the State of California to cause birth defects and other reproductive harm.

Contains: Fish (anchovy, sardine), Soy

Do not exceed 90 days of continuous use of this product without a two (2) week break.

Do not use if you may become pregnant, are pregnant or nursing.

Do not exceed recommended daily intake.

Storage

Store in a cool, dry place.

General

3059-LAB-06/15 IN036239 Ver. 13

Formulation

No preservatives added.

Enhanced Physical & Mental Well-Being without Caffeine

See for yourself

Ginza-Plus by Irwin Naturals label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

What’s inside

The Ingredients in Ginza-Plus by Irwin Naturals

These are the 8 active ingredients this product is made of. Select any to open its full monograph.

Serving size3 Liquid Softgel(s) Dosage formSoftgel Capsule Servings per container25 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

BioPerine Complex

6 mg per serving

Fish Oil

Interacts with
327 drugs
1500 mg per serving

Fish oil provides omega-3 fatty acids (EPA and DHA) that are best known for lowering high triglyceride levels. The evidence for other heart and health...

Fish Oil monograph & interactions

Maca powder

No known
interactions
500 mg per serving

Maca is a nutrient-rich Andean root often used for energy, libido, and menopause symptoms. Early studies suggest it may modestly help sexual desire an...

Maca powder monograph & interactions

Asian Ginseng extract

Interacts with
1,130 drugs
62 mg per serving Form: Ginsenosides

Panax ginseng is a popular traditional herb used to boost energy, ease stress, and support overall wellness, though scientific evidence is mixed and m...

Asian Ginseng extract monograph & interactions

Rhodiola (Rhodiola rosea) powder

Interacts with
1,271 drugs
250 mg per serving

Rhodiola is an herb traditionally used to fight fatigue and help the body cope with stress. Some small studies suggest it may modestly reduce fatigue...

Rhodiola (Rhodiola rosea) powder monograph & interactions
250 mg per serving

Schisandra is a traditional Chinese medicine berry used as an adaptogen for stress, fatigue, and liver support. Human evidence is limited and most cla...

Schisandra (Schisandra chinensis) powder monograph & interactions

Cordyceps (Cordyceps sinensis) extract

Interacts with
249 drugs
50 mg per serving

Cordyceps is a fungus used in traditional Chinese medicine for energy, exercise performance, and lung and immune support. Human research is limited an...

Cordyceps (Cordyceps sinensis) extract monograph & interactions

Other (inactive) ingredients: Gelatin, Purified Water, Beeswax, Glycerin, Soy Lecithin, Annatto, Titanium Dioxide, St. John's Bread, Turmeric. These complete the product’s ingredient list but are not active constituents.

Interaction report

Ginza-Plus by Irwin Naturals Drug Interactions

Want to check YOUR meds against Ginza-Plus?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

Go to the checker
1,458Drugs
1,333 Moderate 125 Minor

Each ingredient & the kinds of drugs it affects

For each ingredient in Ginza-Plus with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.

Rhodiola (Rhodiola rosea) powder10 drug types · 1,271 drugs

Antidiabetes Drugs

Theoretically, taking rhodiola with antidiabetes drugs might increase the risk of hypoglycemia.
In vitro and animal research shows that rhodiola extract can decrease blood glucose due to alpha-glucosidase activity.

Likelihood Possible Evidence D
Antihypertensive Drugs

Theoretically, taking rhodiola with antihypertensive drugs might increase the risk of hypotension.
In vitro and animal research shows that rhodiola extract inhibits angiotensin-converting enzyme (ACE) and might lower blood pressure.

Likelihood Possible Evidence D
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, rhodiola might increase levels of drugs metabolized by CYP2C9.
In vitro research shows that rhodiola inhibits CYP2C9. This effect is highly variable and appears to be dependent on the rhodiola product studied. Also, a clinical study in healthy young males found that taking rhodiola extract 290 mg daily for 14 days reduces the metabolism of losartan, a CYP2C9 substrate, by 21% after 4 hours.

Likelihood Possible Evidence B
Immunosuppressants

Theoretically, rhodiola use might interfere with immunosuppressive therapy.
In vitro and animal research show that rhodiola has immunostimulatory effects.

Likelihood Possible Evidence D
Losartan (Cozaar)

Rhodiola might increase the levels and adverse effects of losartan.
A clinical study in healthy young males found that taking rhodiola extract 290 mg daily for 14 days reduces the metabolism of losartan, a CYP2C9 substrate, by 21% after 4 hours.

Likelihood Probable Evidence B
P-Glycoprotein Substrates

Theoretically, rhodiola might increase levels of P-glycoprotein substrates.
In vitro research shows that rhodiola inhibits P-glycoprotein. Theoretically, using rhodiola with P-glycoprotein substrates might increase drug levels and potentially increase the risk of adverse effects.

Likelihood Possible Evidence D
Antidepressant Drugs

Theoretically, rhodiola might increase the risk of adverse effects when taken with antidepressants.
A review of adverse event reports in Poland identified cases of tachyarrhythmias, myalgia, arthralgia, gum pain, restless leg syndrome, swallowing disorders, and changes in consciousness when rhodiola was taken in combination with paroxetine, escitalopram, fluoxetine, sertraline, trazodone, and/or duloxetine.

Likelihood Possible Evidence D
Cns Depressants

Theoretically, rhodiola might increase the risk of adverse effects when taken with CNS depressants.
A review of adverse event reports in Poland identified cases of excessive sedation, myoclonus, hypotension, and hallucinations when rhodiola was taken with haloperidol, diazepam, or alprazolam.

Likelihood Possible Evidence D
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, rhodiola might increase levels of drugs metabolized by CYP1A2.
In vitro research shows that rhodiola inhibits CYP1A2. This effect is highly variable and appears to be dependent on the rhodiola product studied. However, a clinical study in healthy young males found that taking rhodiola extract 290 mg daily for 14 days does not inhibit the metabolism of caffeine, a CYP1A2 substrate.

Likelihood Possible Evidence B
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, rhodiola might increase levels of drugs metabolized by CYP3A4.
In vitro research shows that rhodiola inhibits CYP3A4. This effect is highly variable and appears to be dependent on the rhodiola product studied. However, a clinical study in healthy young males found that taking rhodiola extract 290 mg daily for 14 days does not inhibit the metabolism of midazolam, a CYP3A4 substrate.

Likelihood Possible Evidence B

Asian Ginseng extract20 drug types · 1,130 drugs

Anticoagulant/Antiplatelet Drugs

Although Panax ginseng has shown antiplatelet effects in the laboratory, it is unlikely to increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
In vitro evidence suggests that ginsenoside constituents in Panax ginseng might decrease platelet aggregation. However, research in humans suggests that ginseng does not affect platelet aggregation. Animal research indicates low oral bioavailability of Rb1 and rapid elimination of Rg1, which might explain the discrepancy between in vitro and human research. Until more is known, use with caution in patients concurrently taking anticoagulant or antiplatelet drugs.

Likelihood Unlikely Evidence B
Antidiabetes Drugs

Theoretically, taking Panax ginseng with antidiabetes drugs might increase the risk of hypoglycemia.
Clinical research suggests that Panax ginseng might decrease blood glucose levels. Monitor blood glucose levels closely.

Likelihood Probable Evidence B
Caffeine

Theoretically, taking Panax ginseng with caffeine might increase the risk of adverse stimulant effects.
Panax ginseng has been shown to have stimulant effects. Theoretically, caffeine might have an additive effect on the stimulant effects of Panax ginseng.

Likelihood Probable Evidence B
Cytochrome P450 2D6 (Cyp2D6) Substrates

Theoretically, Panax ginseng might increase levels of drugs metabolized by CYP2D6. However, research is conflicting.
There is some evidence that Panax ginseng can inhibit the CYP2D6 enzyme by approximately 6%. In addition, in animal research, Panax ginseng inhibits the metabolism of dextromethorphan, a drug metabolized by CYP2D6, by a small amount. However, contradictory research suggests Panax ginseng might not inhibit CYP2D6. Until more is known, use Panax ginseng cautiously in patients taking drugs metabolized by these enzymes.

Likelihood Possible Evidence B
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, Panax ginseng might increase or decrease levels of drugs metabolized by CYP3A4.
Panax ginseng may affect the clearance of drugs metabolized by CYP3A4. One such drug is imatinib. Inhibition of CYP3A4 was believed to be responsible for a case of imatinib-induced hepatotoxicity. In contrast, Panax ginseng has been shown to increase the clearance of midazolam, another drug metabolized by CYP3A4. Clinical research shows that Panax ginseng can reduce midazolam area under the curve by 44%, maximum plasma concentration by 26%, and time to reach maximum plasma concentration by 29%. Midazolam metabolism was also increased in animals given Panax ginseng. Until more is known, use Panax ginseng cautiously in combination with CYP3A4 substrates.

Likelihood Possible Evidence B
Estrogens

Theoretically, concomitant use of large amounts of Panax ginseng might interfere with hormone replacement therapy.
Laboratory research and some case reports suggest that Panax ginseng can have estrogenic effects due to competition for estrogen receptors. The estrogenic activity is attributed to the ginsenoside constituents of Panax ginseng.

Likelihood Possible Evidence D
Furosemide (Lasix)

Theoretically, Panax ginseng might reduce the effects of furosemide.
There is some concern that Panax ginseng might contribute to furosemide resistance. There is one case of resistance to furosemide diuresis in a patient taking a germanium-containing ginseng product.

Likelihood Possible Evidence D
Imatinib (Gleevec)

Theoretically, Panax ginseng might increase the effects and adverse effects of imatinib.
A case of imatinib-induced hepatotoxicity has been reported for a 26-year-old male with chronic myelogenous leukemia stabilized on imatinib for 7 years. The patient took imatinib 400 mg along with a Panax ginseng-containing energy drink daily for 3 months. Since imatinib-associated hepatotoxicity typically occurs within 2 years of initiating therapy, it is believed that Panax ginseng affected imatinib toxicity though inhibition of cytochrome P450 3A4. CYP3A4 is the primary enzyme involved in imatinib metabolism.

Likelihood Possible Evidence D
Immunosuppressants

Theoretically, Panax ginseng use might interfere with immunosuppressive therapy.
Panax ginseng might have immune system stimulating properties.

Likelihood Possible Evidence B
Insulin

Theoretically, taking Panax ginseng with insulin might increase the risk of hypoglycemia.
Clinical research suggests that Panax ginseng might decrease blood glucose levels. Insulin dose adjustments might be necessary in patients taking Panax ginseng; use with caution.

Likelihood Probable Evidence B
Midazolam (Versed)

Theoretically, Panax ginseng may increase the clearance of midazolam.
Midazolam is metabolized by cytochrome P450 3A4 (CYP3A4). Clinical research suggests that Panax ginseng can reduce midazolam area under the curve by 44%, maximum plasma concentration by 26%, and time to reach maximum plasma concentration by 29%. Midazolam metabolism was also increased in animals given Panax ginseng.

Likelihood Probable Evidence B
Monoamine Oxidase Inhibitors (Maois)

Theoretically, Panax ginseng can interfere with MAOI therapy.
Concomitant use of Panax ginseng with phenelzine (Nardil) is associated with insomnia, headache, tremors, and hypomania.

Likelihood Probable Evidence D
Nifedipine (Procardia)

Theoretically, taking Panax ginseng with nifedipine might increase serum levels of nifedipine and the risk of hypotension.
Preliminary clinical research shows that concomitant use can increase serum levels of nifedipine in healthy volunteers. This might cause the blood pressure lowering effects of nifedipine to be increased when taken concomitantly with Panax ginseng.

Likelihood Possible Evidence B
Qt Interval-Prolonging Drugs

Theoretically, Panax ginseng has an additive effect with drugs that prolong the QT interval and potentially increase the risk of ventricular arrhythmias. However, research is conflicting.
Clinical research shows that short-term use of Panax ginseng can increase the QT interval. However, no changes in QT interval have been identified with prolonged use.

Likelihood Possible Evidence B
Raltegravir (Isentress)

Theoretically, taking Panax ginseng with raltegravir might increase the risk of liver toxicity.
A case report suggests that concomitant use of Panax ginseng with raltegravir can increase serum levels of raltegravir, resulting in elevated liver enzymes levels.

Likelihood Possible Evidence D
Selegiline (Eldepryl)

Theoretically, Panax ginseng might increase or decrease levels of selegiline, possibly altering the effects and side effects of selegiline.
Animal research shows that taking selegiline with a low dose of Panax ginseng extract (1 gram/kg) reduces selegiline bioavailability, while taking a high dose of Panax ginseng extract (3 grams/kg) increases selegiline bioavailability. More research is needed to confirm these effects.

Likelihood Possible Evidence D
Stimulant Drugs

Theoretically, taking Panax ginseng with stimulant drugs might increase the risk of adverse stimulant effects.
Panax ginseng has been shown to have stimulant effects.

Likelihood Possible Evidence D
Warfarin (Coumadin)

Panax ginseng might affect the clearance of warfarin. However, this interaction appears to be unlikely.
There has been a single case report of decreased effectiveness of warfarin in a patient who also took Panax ginseng. However, it is questionable whether Panax ginseng was the cause of this decrease in warfarin effectiveness. Some research in humans and animals suggests that Panax ginseng does not affect the pharmacokinetics of warfarin. However, other research in humans suggests that Panax ginseng might modestly increase the clearance of the S-warfarin isomer. More evidence is needed to determine whether Panax ginseng causes a significant interaction with warfarin.

Likelihood Unlikely Evidence B
Fexofenadine (Allegra)

Theoretically, Panax ginseng might decrease blood levels of oral or intravenous fexofenadine.
Animal research suggests that taking Panax ginseng in combination with oral or intravenous fexofenadine may reduce the bioavailability of fexofenadine. Some scientists have attributed this effect to the ability of Panax ginseng to increase the expression of P-glycoprotein.

Likelihood Possible Evidence D
Lopinavir/Ritonavir (Kaletra)

Although Panax ginseng has demonstrated variable effects on cytochrome P450 3A4 (CYP3A4), which metabolizes lopinavir, Panax ginseng is unlikely to alter levels of lopinavir/ritonavir.
Lopinavir is metabolized by CYP3A4 and is administered with the CYP3A4 inhibitor ritonavir to increase its plasma concentrations. Panax ginseng has shown variable effects on CYP3A4 activity in humans. However, taking Panax ginseng (Vitamer Laboratories) 500 mg twice daily for 14 days did not alter the pharmacokinetics of lopinavir/ritonavir in 12 healthy volunteers.

Likelihood Unlikely Evidence B

Bioperine Black Pepper extract17 drug types · 1,019 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, black pepper might increase the risk of bleeding when taken with antiplatelet or anticoagulant drugs.
In vitro research shows that piperine, a constituent of black pepper, seems to inhibit platelet aggregation. This has not been reported in humans.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, black pepper might increase the risk of hypoglycemia when taken with antidiabetes drugs.
Animal research shows that piperine, a constituent of black pepper, can reduce blood glucose levels. Monitor blood glucose levels closely. Dose adjustments might be necessary.

Likelihood Possible Evidence D
Atorvastatin (Lipitor)

Theoretically, black pepper might increase blood levels of atorvastatin.
Animal research shows that taking piperine, a constituent of black pepper, 35 mg/kg can increase the maximum serum concentration of atorvastatin three-fold. This has not been reported in humans.

Likelihood Possible Evidence D
Cyclosporine (Neoral, Sandimmune)

Theoretically, black pepper might increase the effects and side effects of cyclosporine.
In vitro research shows that piperine, a constituent of black pepper, increases the bioavailability of cyclosporine. This has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2D6 (Cyp2D6) Substrates

Theoretically, black pepper might increase levels of drugs metabolized by CYP2D6.
In vitro research suggests that some constituents of black pepper inhibit CYP2D6. This has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, black pepper might increase levels of drugs metabolized by CYP3A4.
In vitro research and pharmacokinetic simulation data suggest that piperine, a constituent of black pepper, as well as the pepper fruit seem to inhibit CYP3A4. This has not been reported in humans.

Likelihood Possible Evidence D
Lithium

Theoretically, black pepper might increase blood levels of lithium due to its diuretic effects. The dose of lithium might need to be reduced.
Black pepper is thought to have diuretic properties.

Likelihood Probable Evidence D
Nevirapine (Viramune)

Black pepper might increase blood levels of nevirapine.
Clinical research shows that piperine, a constituent of black pepper, increases the plasma concentration of nevirapine. However, no adverse effects were observed in this study.

Likelihood Probable Evidence D
P-Glycoprotein Substrates

Theoretically, black pepper might increase levels of P-glycoprotein substrates.
In vitro research shows that piperine, a constituent of black pepper, seems to inhibit P-glycoprotein.

Likelihood Possible Evidence D
Pentobarbital (Nembutal)

Theoretically, black pepper might increase the sedative effects of pentobarbital.
Animal research shows that piperine, a constituent of black pepper, increases pentobarbital-induced sleeping time.

Likelihood Possible Evidence D
Phenytoin (Dilantin)

Black pepper might increase blood levels of phenytoin.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption, slow elimination, and increase levels of phenytoin. Taking a single dose of black pepper 1 gram along with phenytoin seems to double the serum concentration of phenytoin. Consuming a soup with black pepper providing piperine 44 mg/200 mL of soup along with phenytoin also seems to increase phenytoin levels when compared with consuming the same soup without black pepper.

Likelihood Possible Evidence B
Propranolol (Inderal)

Black pepper might increase blood levels of propranolol.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption and slow elimination of propranolol.

Likelihood Possible Evidence B
Rifampin (Rifadin)

Black pepper might increase blood levels of rifampin.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption and serum levels of rifampin.

Likelihood Possible Evidence B
Theophylline

Black pepper might increase blood levels of theophylline.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption and slow elimination of theophylline.

Likelihood Possible Evidence D
Amoxicillin (Amoxil, Trimox)

Theoretically, black pepper might increase the effects and side effects of amoxicillin.
Animal research shows that taking piperine, a constituent of black pepper, with amoxicillin increases plasma levels of amoxicillin. This has not been reported in humans.

Likelihood Possible Evidence D
Carbamazepine (Tegretol)

Theoretically, black pepper might increase blood levels of carbamazepine, potentially increasing the effects and side effects of carbamazepine.
One clinical study in patients taking carbamazepine 300 mg or 500 mg twice daily shows that taking a single 20 mg dose of purified piperine, a constituent of black pepper, increases carbamazepine levels. Piperine may increase carbamazepine absorption by increasing blood flow to the GI tract, increasing the surface area of the small intestine, or inhibiting cytochrome P450 3A4 (CYP3A4) in the gut wall. Absorption was significantly increased by 7-10 mcg/mL/hour. The time to eliminate carbamazepine was also increased by 4-8 hours. Although carbamazepine levels were increased, this did not appear to increase side effects. In vitro research also shows that piperine can increase carbamazepine levels by 11% in a time-dependent manner.

Likelihood Possible Evidence B
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, black pepper might decrease levels and clinical effects of drugs metabolized by CYP1A2.
In vitro research suggests that black pepper induces CYP1A2. This has not been reported in humans.

Likelihood Possible Evidence D

Ginger extract14 drug types · 1,007 drugs

Anticoagulant/Antiplatelet Drugs

Ginger may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs. However, research is conflicting.
Laboratory research suggests that ginger inhibits thromboxane synthetase and decreases platelet aggregation. However, this has not been demonstrated unequivocally in humans, with mixed results from clinical trials. Theoretically, excessive amounts of ginger might increase the risk of bleeding when used with anticoagulant/antiplatelet drugs.

Likelihood Possible Evidence B
Antidiabetes Drugs

Theoretically, taking ginger with antidiabetes drugs might increase the risk of hypoglycemia.
Animal and human research suggests that ginger might increase insulin levels and/or decrease blood glucose levels.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Ginger might increase or decrease the levels of CYP3A4 substrates.
In vitro research and some case reports suggest that ginger inhibits CYP3A4 activity. Three case reports from the World Health Organization (WHO) adverse drug reaction database describe increased toxicity in patients taking ginger and cancer medications that are CYP3A4 substrates (imatinib, dabrafenib, and crizotinib). However, the causality of this interaction is unclear due to the presence of multiple interacting drugs and routes of administration.
Conversely, other in vitro research suggests that ginger induces CYP3A4 activity, leading to reduced levels of CYP3A4 substrates. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Losartan (Cozaar)

Theoretically, ginger might increase levels of losartan and the risk of hypotension.
In animal research, ginger increased the levels and hypotensive effects of a single dose of losartan. It is not clear if ginger alters the concentration or effects of losartan when taken continuously. Additionally, this interaction has not been shown in humans.

Likelihood Possible Evidence D
Nifedipine (Procardia)

Ginger may have antiplatelet effects and increase the risk of bleeding if used with nifedipine.
Clinical research shows that combined treatment with ginger 1 gram plus nifedipine 10 mg significantly inhibits platelet aggregation when compared to nifedipine or ginger alone.

Likelihood Possible Evidence B
P-Glycoprotein Substrates

Ginger might increase the absorption and blood levels of P-glycoprotein (P-gp) substrates.
In vitro research and case reports suggest that ginger inhibits drug efflux by P-gp, potentially increasing absorption and serum levels of P-gp substrates. Two case reports from the World Health Organization (WHO) adverse drug reaction database describe increased toxicity in patients taking ginger and cancer medications that are P-gp substrates (trametinib, crizotinib). However, the causality of this interaction is unclear due to the presence of multiple interacting drugs and routes of administration.

Likelihood Possible Evidence D
Phenprocoumon (Marcoumar, Others)

Ginger might increase the risk of bleeding with phenprocoumon.
Phenprocoumon, a warfarin-related anticoagulant, might increase the international normalized ratio (INR) when taken with ginger. There is one case report of a 76-year-old woman with a stable INR on phenprocoumon that increased to greater than 10 when she began consuming dried ginger and ginger tea.

Likelihood Possible Evidence D
Warfarin (Coumadin)

Ginger might increase the risk of bleeding with warfarin.
Laboratory research suggests that ginger might inhibit thromboxane synthetase and decrease platelet aggregation. In one case report, ginger increased the INR when taken with phenprocoumon, which has similar pharmacological effects as warfarin. In another case report, ginger increased the INR when taken with a combination of warfarin, hydrochlorothiazide, and acetaminophen. A longitudinal analysis suggests that taking ginger increases the risk of bleeding in patients taking warfarin for at least 4 months. However, research in healthy people suggests that ginger has no effect on INR, or the pharmacokinetics or pharmacodynamics of warfarin. Until more is known, monitor INRs closely in patients taking large amounts of ginger.

Likelihood Possible Evidence B
Calcium Channel Blockers

Theoretically, taking ginger with calcium channel blockers might increase the risk of hypotension.
Some animal and in vitro research suggests that ginger has hypotensive and calcium channel-blocking effects. Another animal study shows that concomitant administration of ginger and the calcium channel blocker amlodipine leads to greater reductions in blood pressure when compared with amlodipine alone.

Likelihood Unlikely Evidence D
Cyclosporine (Neoral, Sandimmune)

Theoretically, when taken prior to cyclosporine, ginger might decrease cyclosporine levels.
In an animal model, ginger juice taken 2 hours prior to cyclosporine administration reduced the maximum concentration and area under the curve of cyclosporine by 51% and 40%, respectively. This effect was not observed when ginger juice and cyclosporine were administered at the same time.

Likelihood Possible Evidence D
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, ginger might increase the levels of CYP1A2 substrates.
In vitro research shows that ginger inhibits CYP1A2 activity. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2B6 (Cyp2B6) Substrates

Theoretically, ginger might increase the levels of CYP2B6 substrates.
In vitro research shows that ginger inhibits CYP2B6 activity. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, ginger might increase the levels of CYP2C9 substrates.
In vitro research shows that ginger inhibits CYP2C9 activity. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Metronidazole (Flagyl)

Theoretically, ginger might increase levels of metronidazole.
In an animal model, ginger increased the absorption and plasma half-life of metronidazole. In addition, the elimination rate and clearance of metronidazole was significantly reduced.

Likelihood Possible Evidence D

Schisandra (Schisandra chinensis) powder12 drug types · 803 drugs

Cyclophosphamide

Theoretically, schisandra might increase the levels and clinical effects of cyclophosphamide.
In vitro research shows that schisandra increases the concentration of cyclophosphamide, likely through inhibition of cytochrome P450 3A4. After multiple doses of the schisandra constituents schisandrin A and schisantherin A, the maximum concentration of cyclophosphamide was increased by 7% and 75%, respectively, while the overall exposure to cyclophosphamide was increased by 29% and 301%, respectively.

Likelihood Probable Evidence D
Cyclosporine (Neoral, Sandimmune)

Schisandra can increase the levels and clinical effects of cyclosporine.
A small observational study in children with aplastic anemia found that taking schisandra with cyclosporine increased cyclosporine trough levels by 93% without increasing the risk of adverse events. However, the dose of cyclosporine was reduced in 9% of children to maintain appropriate cyclosporine blood concentrations.

Likelihood Probable Evidence B
Cytochrome P450 2C19 (Cyp2C19) Substrates

Theoretically, schisandra might increase the levels and clinical effects of CYP2C19 substrates.
In vitro research shows that schisandra inhibits CYP2C19, and animal research shows that schisandra increases the concentration of voriconazole, a CYP2C19 substrate. Theoretically, schisandra may also inhibit the metabolism of other CYP2C19 substrates. This effect has not been reported in humans.

Likelihood Probable Evidence D
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, schisandra might decrease the levels and clinical effects of CYP2C9 substrates.
In vitro and animal research suggests that schisandra induces CYP2C9 enzymes. This effect has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Schisandra can increase the levels and clinical effects of drugs metabolized by CYP3A4.
Most clinical and laboratory research shows that schisandra, administered either as a single dose or up to twice daily for 14 days, inhibits CYP3A4 and increases the concentration of CYP3A4 substrates such as cyclophosphamide, midazolam, tacrolimus, and talinolol. Although one in vitro and animal study shows that schisandra may induce CYP3A4 metabolism, this effect appears to be overpowered by schisandra's CYP3A4 inhibitory activity and has not been reported in humans.

Likelihood Probable Evidence D
Midazolam (Versed)

Schisandra can increase the levels and clinical effects of midazolam.
A small pharmacokinetic study in healthy adults shows that taking schisandra extract (Hezheng Pharmaceutical Co.) containing deoxyschizandrin 33.75 mg twice daily for 8 days and a single dose of midazolam 15 mg on day 8 increases the overall exposure to midazolam by about 119%, increases the peak plasma level of midazolam by 86%, and decreases midazolam clearance by about 52%. This effect has been attributed to inhibition of CYP3A4 by schisandra.

Likelihood Probable Evidence B
P-Glycoprotein Substrates

Schisandra might increase the levels and clinical effects of P-glycoprotein substrates.
In vitro research shows that schisandra extracts and constituents such as schisandrin B inhibit P-glycoprotein mediated efflux in intestinal cells and in P-glycoprotein over-expressing cell lines. Additionally, a small clinical study shows that schisandra increases the peak concentration and overall exposure to talinolol, a P-glycoprotein probe substrate. Theoretically, schisandra might inhibit the efflux of other P-glycoprotein substrates.

Likelihood Possible Evidence D
Sirolimus (Rapamune)

Schisandra can increase the levels and clinical effects of sirolimus.
A small pharmacokinetic study in healthy volunteers shows that taking 3 capsules of schisandra (Hezheng Pharmaceutical Company) containing a total of 33.75 mg deoxyschizandrin twice daily for 13 days and then taking a single dose of sirolimus 2 mg increases the overall exposure and peak level of sirolimus by two-fold. This effect is thought to be due to inhibition of cytochrome P450 3A4 by schisandra, as well as possible inhibition of the P-glycoprotein drug transporter.

Likelihood Probable Evidence B
Tacrolimus (Prograf)

Schisandra can increase the levels and clinical effects of tacrolimus.
Clinical research in healthy children and adults, transplant patients, and patients with nephrotic syndrome and various rheumatic immunologic disorders shows that taking schisandra with tacrolimus increases tacrolimus peak levels by 183% to 268%, prolongs or delays time to peak tacrolimus concentrations, increases overall exposure to tacrolimus by 126% to 343%, and decreases tacrolimus clearance by 19% to 73%. This effect is thought to be due to inhibition of P-glycoprotein drug transporter and CYP3A4 and CYP3A5 by schisandra. Some clinical and observational studies suggest that schisandra increases tacrolimus levels similarly in both expressors and non-expressors of CYP3A5, while other studies suggest it does so to a greater degree in CYP3A5 expressors than non-expressors. Animal research suggests that the greatest increase in tacrolimus levels occurs when schisandra is taken either concomitantly or up to 2 hours before tacrolimus, and clinical and observational research in humans suggests that schisandra may increase whole blood levels of tacrolimus and decrease clearance of tacrolimus in a dose-dependent manner.

Likelihood Probable Evidence B
Talinolol

Schisandra can increase the levels and clinical effects of talinolol.
A small pharmacokinetic study in healthy volunteers shows that taking schisandra extract 300 mg twice daily for 14 days with a single dose of talinolol 100 mg on day 14 increases the peak talinolol level by 51% and the overall exposure to talinolol by 47%. This effect is thought to be due to the possible inhibition of cytochrome P450 3A4 and P-glycoprotein by schisandra. tly.

Likelihood Probable Evidence B
Voriconazole (Vfend)

Theoretically, schisandra might increase the levels and clinical effects of voriconazole.
Animal research shows that oral schisandra given daily for 1 or 14 days increases levels of intravenously administered voriconazole, a cytochrome P450 (CYP) 2C19 substrate. This effect is thought to be due to inhibition of CYP2C19 by schisandra. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Warfarin (Coumadin)

Theoretically, schisandra might decrease the levels and clinical effects of warfarin.
Animal research suggests that oral schisandra extract, given daily for 6 days, reduces levels of intravenously administered warfarin. This effect might be due to the induction of cytochrome P450 (CYP) 2C9 metabolism by schisandra. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D

Fish Oil9 drug types · 327 drugs

Antihypertensive Drugs

Theoretically, taking fish oil with antihypertensive drugs might increase the risk of hypotension.
Clinical evidence indicates that fish oils can modestly lower blood pressure and might have additive effects in patients treated with antihypertensives.

Likelihood Probable Evidence B
Contraceptive Drugs

Theoretically, taking fish oil with contraceptive drugs might decrease the triglyceride-lowering effects of fish oil.
There is some evidence that contraceptive drugs might interfere with the triglyceride lowering effects of fish oils.

Likelihood Probable Evidence B
Cyclosporine (Neoral, Sandimmune)

Taking fish oil with cyclosporine might increase levels and adverse effects of cyclosporine.
In kidney transplant recipients on a general immunosuppressive regimen, taking omega-3 fatty acids daily seems to increase peak blood levels of cyclosporine when compared with placebo. This increase was as much as 20% after one month. However, the area under the curve was not significantly affected.

Likelihood Probable Evidence B
Orlistat (Xenical, Alli)

Theoretically, taking fish oil with orlistat might decrease the absorption of fish oil fatty acids.
Orlistat binds lipase in the gastrointestinal tract and reduces fat absorption. Theoretically, taking fish oil with orlistat might decrease absorption of fish oil fatty acids. To avoid this potential interaction, recommend separating administration of orlistat and fish oil by at least 2 hours.

Likelihood Probable Evidence D
Sirolimus (Rapamune)

Taking fish oil with sirolimus might increase levels and adverse effects of sirolimus.
Pharmacokinetic research shows that omega-3 fatty acids increase exposure to sirolimus in kidney transplant patients on a calcineurin inhibitor-free immunosuppressive regimen. A 25% dose reduction in sirolimus was required to keep patients within the expected trough-concentration window. Researchers hypothesize that this may be due to inhibition of cytochrome P450 3A4 (CYP3A4) by fish oil, although this has not been confirmed in clinical research.

Likelihood Probable Evidence B
Tacrolimus (Prograf)

Taking fish oil with tacrolimus might increase levels and adverse effects of tacrolimus.
In a small group of patients, taking fish oil 2.6 grams (Omacor) daily for 4 weeks increased the 8-hour area under the curve of tacrolimus by 25% when compared with baseline. Peak levels were increased by approximately 22%. Researchers hypothesize that this may be due either to an increase in bioavailability or to inhibition of cytochrome P450 3A4 (CYP3A4) by fish oil, although this has not been confirmed in clinical research.

Likelihood Probable Evidence B
Anticoagulant/Antiplatelet Drugs

Fish oil may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs. However, evidence is conflicting.
While fish oil may not be a potent inhibitor of platelet function, high doses of fish oil might have antiplatelet effects. Theoretically, concomitant use of fish oil with anticoagulant or antiplatelet drugs may increase the risk of bleeding. However, the most rigorous research shows that short-term doses of fish oil 10 grams daily or long-term doses of 1.5 grams daily for up to 52 weeks does not increase the risk of bleeding or affect coagulation parameters in chronically ill and vulnerable patients. Other controlled research shows that fish oil does not affect platelet function or increase the risk of bleeding. Some research even suggests that perioperative fish oil use decreases bleeding risk. Some research suggests fish oil does not have additive antiplatelet effects when combined with aspirin, but other clinical evidence suggests that adding fish oil to low-dose aspirin treatment increases antiplatelet effects in patients who are aspirin-resistant. Also, some clinical research seems to show that fish oil has additive antiplatelet effects when used with aspirin and clopidogrel compared to aspirin and clopidogrel alone.

Likelihood Unlikely Evidence B
Platinum Agents

Theoretically, taking fish oil with platinum agents can cause resistance to platinum agents, potentially decreasing their effectiveness.
Platinum-induced fatty acids (PIFAs) are fatty acids secreted from human and mouse stem cells when exposed to platinum-based chemotherapy. Animal research suggests that PIFAs cause resistance to chemotherapy by stimulating lysophospholipid production in the spleen, which interferes with the DNA damage caused by certain chemotherapy drugs. One PIFA, known as 16:4(n-3), has been found in both raw fish and some commercially available fish oil products. Mackerel and herring have high PIFA concentrations, while salmon and tuna have low PIFA concentrations. Levels of PIFA in commercial fish oil products ranged from 0.2- 5.7 microMol. Animal research shows that PIFA-containing fish oil products cause resistance to cisplatin, fluorouracil, irinotecan, and oxaliplatin. It is unclear if all commercially available fish oil products contain PIFAs. Additionally, it is argued that levels of PIFA found in some fish oil products are too low to be of clinical concern. Furthermore, a lack of chemotherapy resistance in countries with high fish intake, such as Greenland, Japan, and Norway, suggest that this interaction may not be clinically significant.

Likelihood Unlikely Evidence D
Warfarin (Coumadin)

Fish oil may have antiplatelet effects and might increase the risk of bleeding if used with warfarin.
Fish oil has antiplatelet effects at high doses. Case reports show elevated INR in patients taking warfarin and fish oil 1-2 grams daily. However, some clinical research shows that taking fish oil 3-6 grams daily does not significantly increase INR in patients taking warfarin.

Likelihood Unlikely Evidence B

Cordyceps (Cordyceps sinensis) extract3 drug types · 249 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, cordyceps may increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
In vitro and animal research suggests that cordyceps extract inhibits platelet aggregation and function. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Immunosuppressants

Theoretically, concurrent use of cordyceps might interfere with immunosuppressive therapy.
Animal and in vitro research suggests that cordyceps stimulates the immune system. However, limited clinical research suggests that taking cordyceps may lower the necessary therapeutic dose of the immunosuppressant cyclosporine, which suggests that cordyceps may have an immunosuppressive effect.

Likelihood Possible Evidence B
Testosterone

Theoretically, concurrent use of cordyceps and testosterone might have additive effects.
Animal research suggests that cordyceps can increase testosterone levels. The clinical significance of this finding is unclear.

Likelihood Possible Evidence D
The maker

Brand information

Manufacturer and brand details for Ginza-Plus, from the product label.

Irwin Naturals

See all Irwin Naturals products
Name
Irwin Naturals
Street Address
5310 Beethoven Street
City
Los Angeles
State
CA
ZipCode
90066
Web Address
www.IrwinNaturals.com
Pharmacist Counseling Corner

Ginza-Plus by Irwin Naturals: Common Questions

Does Ginza-Plus by Irwin Naturals interact with any medications?
Yes. Based on its ingredients, Ginza-Plus has a known interaction with 1,458 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Ginza-Plus contains 8 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I take Ginza-Plus if I'm on blood thinners like warfarin?
Not without checking first. Ginger, fish oil, and possibly cordyceps in this product may increase bleeding risk with warfarin and other blood thinners. Talk with your doctor or pharmacist before taking this product alongside any blood-thinning medication.
What's black pepper extract doing in this supplement?
Black pepper (Bioperine) is included to enhance absorption of the other ingredients. However, it also raises blood levels of certain medications—including seizure drugs, heart medications, and antibiotics—so it's important to check for interactions if you're on prescription medications.
Is ginger in Ginza-Plus safe for pregnancy nausea?
Ginger is rated Likely Safe or Possibly Safe in pregnancy and is Possibly Effective for pregnancy-related nausea, but the full product also contains other ingredients with insufficient safety data in pregnancy. Talk with your doctor or midwife before using Ginza-Plus while pregnant.
Will Ginza-Plus help me with my energy or athletic performance?
The product contains ginseng and cordyceps, which are traditionally used for energy and stamina. However, the evidence in our data is rated Insufficient or Possibly Ineffective for most of those claims—meaning we don't yet have solid proof they work. Discuss with your healthcare provider whether it's likely to help your specific goal.
What are the most common side effects I might notice?
The most likely mild side effects are from ginger and black pepper—heartburn, burning mouth sensation, or digestive upset—especially at higher doses or on an empty stomach. Fish oil may cause a fishy aftertaste or loose stools. These are usually manageable, but talk with your pharmacist if they persist.
Is it safe to take Ginza-Plus while I'm breastfeeding?
Black pepper and fish oil are Likely Safe while breastfeeding, but maca, Asian ginseng, rhodiola, schisandra, and cordyceps lack enough safety data. Talk with your doctor or pharmacist before using this product while breastfeeding to weigh the risks and benefits for your situation.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Go deeper

The Full Monographs Behind Ginza-Plus’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Black Pepper

Interacts with 1,019 drugs

Black pepper is a common kitchen spice that is generally safe in the amounts used in food. Its extract, piperine, is mostly added to supplements to help the body absorb other ingredients (li...

Read the full Black Pepper monograph →
Herb & supplement monograph

Ginger

Interacts with 1,007 drugs

Ginger is a widely used culinary spice with a long history in traditional medicine, and it has the strongest evidence for helping with nausea and vomiting, including from motion sickness, pr...

Read the full Ginger monograph →
Herb & supplement monograph

Fish Oil

Interacts with 327 drugs

Fish oil provides omega-3 fatty acids (EPA and DHA) that are best known for lowering high triglyceride levels. The evidence for other heart and health benefits is mixed, and it is generally...

Read the full Fish Oil monograph →
Herb & supplement monograph

Maca

Maca is a nutrient-rich Andean root often used for energy, libido, and menopause symptoms. Early studies suggest it may modestly help sexual desire and some menopause symptoms, but the evide...

Read the full Maca monograph →
Herb & supplement monograph

Panax Ginseng

Interacts with 1,130 drugs

Panax ginseng is a popular traditional herb used to boost energy, ease stress, and support overall wellness, though scientific evidence is mixed and mostly preliminary. It is generally well...

Read the full Panax Ginseng monograph →
Herb & supplement monograph

Rhodiola

Interacts with 1,271 drugs

Rhodiola is an herb traditionally used to fight fatigue and help the body cope with stress. Some small studies suggest it may modestly reduce fatigue and improve mood, but the evidence is li...

Read the full Rhodiola monograph →
Herb & supplement monograph

Schisandra

Interacts with 803 drugs

Schisandra is a traditional Chinese medicine berry used as an adaptogen for stress, fatigue, and liver support. Human evidence is limited and most claims are not well proven, but it appears...

Read the full Schisandra monograph →
Herb & supplement monograph

Cordyceps

Interacts with 249 drugs

Cordyceps is a fungus used in traditional Chinese medicine for energy, exercise performance, and lung and immune support. Human research is limited and mostly low quality, so its benefits ar...

Read the full Cordyceps monograph →
Sources

Sources & How We Checked

Ginza-Plus's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 370 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Black Pepper 29 references
  1. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  2. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  3. Bano G, Amla V, Raina RK, et al. The effect of piperine on pharmacokinetics of phenytoin in healthy volunteers. Planta Med 1987;53:568-9. PubMed
  4. Bano G, et al. Effect of piperine on bioavailability and pharmacokinetics of propranolol and theophylline in healthy volunteers. Eur J Clin Pharmacol 1991;41;615-7. PubMed
  5. Cohle SD, Trestrail JD III, Graham MA, et al. Fatal pepper aspiration. Am J Dis Child 1988;142:633-6. PubMed
  6. Bhardwaj RK, Glaeser H, Becquemont L, et al. Piperine, a major constituent of black pepper, inhibits human P-glycoprotein and CYP3A4. J Pharmacol Exp Ther 2002;302:645-50. PubMed
  7. Velpandian T, Jasuja R, Bhardwaj RK, et al. Piperine in food: interference in the pharmacokinetics of phenytoin. Eur J Drug Metab Pharmacokinet 2001;26:241-7. PubMed
  8. Pattanaik S, Hota D, Prabhakar S, et al. Pharmacokinetic interaction of a single dose of piperine with steady-state carbamazepine in epilepsy patients. Phytother Res 2009;23:1281-6.
  9. Munakata, M., Kobayashi, K., Niisato-Nezu, J., Tanaka, S., Kakisaka, Y., Ebihara, T., Ebihara, S., Haginoya, K., Tsuchiya, S., and Onuma, A. Olfactory stimulation using black pepper oil facilitates oral feeding in pediatric patients receiving long-term en
  10. Myers, B. M., Smith, J. L., and Graham, D. Y. Effect of red pepper and black pepper on the stomach. Am J Gastroenterol 1987;82(3):211-214.
  11. Raghavendra, R. H. and Naidu, K. A. Spice active principles as the inhibitors of human platelet aggregation and thromboxane biosynthesis. Prostaglandins Leukot.Essent.Fatty Acids 2009;81(1):73-78. PubMed
  12. Subehan, Usia, T., Kadota, S., and Tezuka, Y. Mechanism-based inhibition of human liver microsomal cytochrome P450 2D6 (CYP2D6) by alkamides of Piper nigrum. Planta Med 2006;72(6):527-532.
  13. Kasibhatta, R. and Naidu, M. U. Influence of piperine on the pharmacokinetics of nevirapine under fasting conditions: a randomised, crossover, placebo-controlled study. Drugs R.D. 2007;8(6):383-391. PubMed
  14. Usia, T., Iwata, H., Hiratsuka, A., Watabe, T., Kadota, S., and Tezuka, Y. CYP3A4 and CYP2D6 inhibitory activities of Indonesian medicinal plants. Phytomedicine. 2006;13(1-2):67-73. PubMed
  15. Mujumdar, A. M., Dhuley, J. N., Deshmukh, V. K., Raman, P. H., Thorat, S. L., and Naik, S. R. Effect of piperine on pentobarbitone induced hypnosis in rats. Indian J Exp.Biol. 1990;28(5):486-487.
  16. Panda, S. and Kar, A. Piperine lowers the serum concentrations of thyroid hormones, glucose and hepatic 5'D activity in adult male mice. Horm.Metab Res. 2003;35(9):523-526. PubMed
  17. Lawless, H. and Stevens, D. A. Effects of oral chemical irritation on taste. Physiol Behav. 1984;32(6):995-998. PubMed
  18. Hiwale, A. R., Dhuley, J. N., and Naik, S. R. Effect of co-administration of piperine on pharmacokinetics of beta-lactam antibiotics in rats. Indian J Exp.Biol. 2002;40(3):277-281.
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Maca 1 reference
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Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

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