Interactions on record — worth a quick check against your medications. Based on 5 of 8 ingredients. Check your meds →
Dietary supplement

999 Gastro Instant Granules Ingredients & Drug Interactions

by Ron Teeguarden's Dragon Herbs

999 Gastro Instant Granules label
See full label image
Powder Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 30, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking 999 Gastro Instant Granules against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

999 Gastro Instant Granules is a dietary supplement by Ron Teeguarden's Dragon Herbs with 8 active ingredients. Its ingredients are commonly taken for kidney and adrenal support, anemia and blood building (traditional), inflammatory conditions.Based on those ingredients, 1,429 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Evodia lepta, Scutellaria baicalensis, White Peony. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against 999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs

Ask about any prescription or over-the-counter medication and we check it for interactions with 999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of 999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs

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

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 8 active ingredients.

999 Gastro Instant Granules contains 8 ingredients, of which we identify 5 active herbal components: Rehmannia, White Peony, Poria mushroom, Scutellaria baicalensis (Baikal skullcap), and Evodia lepta. The product also contains three other herbs — Murraya exotica, Zanthorplum nitidum, and Common Vladmiria — for which we lack detailed information.

These are mixed into a powder base of sucrose and other inactive ingredients.

Does it work?

Not established
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
Not established

The graded evidence we hold for these ingredients covers different conditions than the ones this product is marketed for, so there's no established rating for its stated use.

Why this rating?
  • The label markets this product for: soothe minor temporary digestive discomfort.
  • We looked for evidence on: Dyspepsia, Diarrhea, Hemorrhoids, gastritis, nausea, abdominal pain.
  • The closest evidence on file: Peony is rated "Insufficient Reliable Evidence To Rate" for Dyspepsia (Natural Medicines).
  • Also on file: Poria Mushroom is rated "Insufficient Reliable Evidence To Rate" for Diarrhea.
  • Also on file: Baikal Skullcap is rated "Insufficient Reliable Evidence To Rate" for Hemorrhoids.

The effectiveness evidence for most ingredients in this product is not established in the data we hold. Rehmannia is rated possibly effective for chronic kidney disease, but rated as having insufficient evidence for aplastic anemia, atopic disease, osteoporosis, diabetes, and diabetic nephropathy.

White Peony, Poria mushroom, Scutellaria baicalensis, and Evodia lepta all have insufficient evidence for the conditions we reviewed — meaning their benefits haven't been reliably demonstrated in the studies available to us. If you're considering this product for a specific digestive or health concern, talk with your pharmacist or doctor about whether the evidence supports its use for your situation.

The evidence, ingredient by ingredient Rehmannia Peony Poria Mushroom Baikal Skullcap Evodia

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 4 of the 5 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 5 of 5.
  • General safety write-ups exist for 5 of 5.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Human safety data for most ingredients in this formula are limited. White Peony seems generally well tolerated when used short-term, though it can cause gastrointestinal side effects including abdominal bloating, loss of appetite, diarrhea, nausea, and discomfort in some people — diarrhea was reported in 5% of study participants taking a related compound at high dose.

Baikal skullcap is also generally well tolerated but may cause abdominal pain, constipation, diarrhea, nausea, vomiting, or skin reactions. Poria mushroom has caused rare allergic reactions including allergic rhinitis and asthma.

Evodia has no reliable safety data from human trials; animal studies show it can prolong the QT interval (a heart rhythm measure) and cause dangerous arrhythmias at high doses, though it's unclear what dose matters in humans. Rehmannia, Poria, and Baikal skullcap are all advised against during pregnancy and breastfeeding due to insufficient safety information.

Evodia is rated possibly unsafe in pregnancy and lacks breastfeeding data. White Peony is rated possibly unsafe in pregnancy with no reliable breastfeeding data.

There is no safety data on file for Murraya exotica, Zanthorplum nitidum, or Common Vladmiria.

Side effects, ingredient by ingredient Rehmannia Peony Poria Mushroom Baikal Skullcap Evodia

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?
  • 5 of the 5 matched ingredients can interact with medications — Peony, Poria Mushroom, Baikal Skullcap, Rehmannia, Evodia.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; diabetes medications; heart-rhythm medications; lithium.
  • For scale: 1,430 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 999 Gastro Instant Granules, check with your pharmacist if you're on any of these: blood pressure medications (antihypertensives); diabetes medications; blood thinners or antiplatelet drugs like aspirin or warfarin; hormone-based contraceptives or estrogen replacement therapy; theophylline or other respiratory drugs; sedatives or sleep aids; antipsychotics like clozapine; seizure medications like phenytoin; lithium; antithyroid drugs; or any medication that prolongs the QT interval (a heart rhythm measure). Additionally, if you take drugs metabolized by liver enzymes (CYP1A2, CYP3A4, or CYP2C19), mention this product to your pharmacist.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.

This is a traditional herbal formula with multiple documented interactions, especially with blood pressure, diabetes, and heart medications, as well as blood thinners and hormonal contraceptives. If you take any prescription medications, use the checker on this page before starting.

Pregnant or breastfeeding individuals should talk with their doctor or pharmacist — the safety data don't support use. Anyone with a heart rhythm condition should be cautious and consult their healthcare provider first.

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

Assessment coverage: 5 of 8 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Sep 25, 2024.

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 999 Gastro Instant Granules, straight from the product label.

Brand Ron Teeguarden's Dragon Herbs
Barcode (UPC) 679372006165
Net contents 7.05 Ounce(s); 200 Gram(s)
Market status On market
Date entered into DSLD Sep 25, 2024
DSLD ID 316724
Product type Botanical
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Children (All)
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 999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs, 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:
20 Gram(s)
Maximum serving Sizes:
20 Gram(s)
UPC/BARCODE
679372006165
IngredientAmount% DV
Rehmannia0 NP--
White Peony0 NP--
Poria0 NP--
Scutellaria baicalensis0 NP--
Evodia lepta0 NP--
Murraya exotica0 NP--
Zanthorplum nitidum0 NP--
Common Vladmiria0 NP--

Other ingredients: Sucrose, Powder

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.
Formulation

999 Gastro instant granule is used to sooth minor temporary digestive discomfort.

Suggested/Recommended/Usage/Directions

Dosage: Dissolve 1.5 tbsp (20 g) in 8 oz. hot water. Consume twice a day.

Precautions

Precautions: For best results, avoid greasy, raw, cold, and hard-to-digest food.

Take only under a physicians guidance if pregnant and/or diabetic.

Children should take this product under adult supervision.

Keep away from children.

Consult with your physician if you are taking medicine.

Storage

Storage: Keep sealed.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs label

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

999 Gastro Instant Granules label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in 999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs

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

Serving size20 Gram(s) Dosage formPowder 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.

Rehmannia

Interacts with
258 drugs
0 NP per serving

Rehmannia is a root used for centuries in Traditional Chinese Medicine, often to 'tonify' the kidneys and support energy or blood health. Human eviden...

Rehmannia monograph & interactions

White Peony

Interacts with
813 drugs
0 NP per serving

Peony root is a traditional Chinese medicine herb often used for menstrual problems, cramps, and inflammation, frequently as part of combination formu...

White Peony monograph & interactions

Poria

Interacts with
417 drugs
0 NP per serving

Poria mushroom (Fu Ling) is a fungus long used in Traditional Chinese Medicine, mainly as a mild diuretic and digestive and calming aid. Modern scient...

Poria monograph & interactions

Scutellaria baicalensis

Interacts with
948 drugs
0 NP per serving

Baikal skullcap is a traditional Chinese herb (Huang Qin) used for inflammation, allergies, and infections, with active compounds like baicalin and ba...

Scutellaria baicalensis monograph & interactions

Evodia lepta

Interacts with
951 drugs
0 NP per serving

Evodia is a fruit used in traditional Chinese medicine, most often for digestive complaints, headaches, and menstrual pain. Human evidence for these u...

Evodia lepta monograph & interactions

Murraya exotica

0 NP per serving

Zanthorplum nitidum

0 NP per serving

Common Vladmiria

0 NP per serving

Other (inactive) ingredients: Sucrose, Powder. These complete the product’s ingredient list but are not active constituents.

Interaction report

999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs Drug Interactions

Want to check YOUR meds against 999 Gastro Instant Granules?

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
1,429Drugs
1,365 Moderate 64 Minor

Ingredients driving the most interactions

Evodia lepta 951
Scutellaria baicalensis 948
White Peony 813
Poria 417
Rehmannia 258

Individual Drug Interactions

The ingredients in 999 Gastro Instant Granules interact with 1,429 drugs. Click any drug to see the details.

5 of the 8 ingredients in 999 Gastro Instant Granules interact with drugs. Each result below shows which ingredient is responsible. Evodia lepta Scutellaria baicalensis White Peony Poria Rehmannia

Each ingredient & the kinds of drugs it affects

For each ingredient in 999 Gastro Instant Granules 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.

Evodia lepta11 drug types · 951 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, taking evodia with antiplatelet or anticoagulant drugs might increase the risk of bruising and bleeding.
In vitro and animal studies show that rutaecarpine, a constituent of evodia, inhibits platelet aggregation.

Likelihood Possible Evidence D
Caffeine

Theoretically, evodia might decrease the levels and clinical effects of caffeine.
In animal models, evodia extract decreases caffeine levels by up to 71%. Evodia extract induces hepatic cytochrome P450 1A2 (CYP1A2) enzyme, of which caffeine is a substrate.

Likelihood Probable Evidence D
Chlorzoxazone (Parafon Forte, Paraflex)

Theoretically, evodia might decrease the levels and clinical effects of chlorzoxazone.
Animal research shows that administration of rutaecarpine, a constituent of evodia, with chlorzoxazone reduces the area under the curve (AUC) of chlorzoxazone by 84% and increases its clearance by 646%. This interaction is likely due to induction of cytochrome P450 2E1 (CYP2E1) by rutaecarpine .

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

Theoretically, drugs that inhibit CYP1A2 might increase the levels and clinical effects of evodia.
The evodia constituent rutaecarpine is metabolized by CYP1A2.

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

Evodia might reduce the levels and clinical effects of CYP1A2 substrates through induction of CYP1A2.
Evodia extract and the evodia constituent rutaecarpine induce hepatic CYP1A2 enzyme activity. Evodia decreases levels of theophylline and caffeine, CYP1A2 substrates, by about 70% in animal models.

Likelihood Probable Evidence D
Cytochrome P450 2E1 (Cyp2E1) Substrates

Theoretically, evodia might reduce the levels and clinical effects of CYP2E1 substrates through induction of CYP2E1.
Animal research suggests that rutaecarpine, a constituent of evodia, induces CYP2E1 activity. In rats, rutaecarpine increases markers of CYP2E1 activity, and administration of rutaecarpine with chlorzoxazone, a known CYP2E1 substrate, reduces the area under the curve (AUC) of chlorzoxazone by 84% and increases its clearance by 646%.

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

Theoretically, taking CYP3A4 inducers might decrease the levels and clinical effects of evodia.
Animal research shows that concomitant administration of dexamethasone, a known CYP3A4 inducer, with the alkaloid constituents of evodia significantly reduces the area under the curve (AUC), maximum concentration (Cmax), and half-life of these constituents.

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

Theoretically, CYP3A4 inhibitors might increase the levels and clinical effects of evodia.
Animal research shows that concomitant administration of ketoconazole, a known CYP3A4 inhibitor, with the alkaloid constituents of evodia significantly increases the area under the curve (AUC), maximum concentration (Cmax), and half-life of these constituents.

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

Theoretically, evodia might increase the levels and clinical effects of CYP3A4 substrates.
In vitro research shows that evodia extract inhibits hepatic CYP3A4. This effect has not been reported in humans.

Likelihood Possible Evidence D
Qt Interval-Prolonging Drugs

Theoretically, evodia might have an additive effect with drugs that prolong the QT interval, potentially increasing the risk of ventricular arrhythmias.
Evodia has demonstrated dose-dependent activity as a proarrhythmic agent in animal and in vitro studies. Evodia infusion in animals extends the action duration potential and induces prolongation of the QT interval and Torsade de pointes.

Likelihood Possible Evidence D
Theophylline

Theoretically, evodia might decrease the levels and clinical effects of theophylline.
The evodia constituent rutaecarpine decreases theophylline levels and half-life by about 70% in animal models. This constituent appears to induce hepatic cytochrome P450 1A2 (CYP1A2) enzyme activity, of which theophylline is a substrate. Rutaecarpine is the primary active constituent of evodia; however, it is not known if the whole crude extract of evodia also causes this interaction.

Likelihood Probable Evidence D
Evodia lepta full monograph & interactions

Scutellaria baicalensis12 drug types · 948 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, Baikal skullcap might increase the risk of bleeding when used concomitantly with anticoagulant and antiplatelet drugs.
Preliminary clinical research suggests that taking capsules containing a combination of astragalus, goldthread, and Baikal skullcap daily for 4 weeks inhibits platelet aggregation; the effect seems to be similar to that of aspirin 50 mg daily. It is unclear if this effect is due to Baikal skullcap, other ingredients, or the combination.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, concomitant use of Baikal skullcap with antidiabetes drugs might enhance blood glucose lowering effects.
Baicalein, a constituent of Baikal skullcap, has alpha-glucosidase inhibitory activity in vitro. Animal research also suggests that Baikal skullcap enhances the antidiabetic effects of metformin. However, in a small human study, taking Baikal skullcap extract did not enhance the antidiabetic effects of metformin, although it did modestly lower glucose levels during an oral glucose tolerance test (OGTT). Until more is known, use cautiously.

Likelihood Possible Evidence B
Antihypertensive Drugs

Theoretically, concomitant use of Baikal skullcap with antihypertensive drugs might have additive effects and increase the risk of hypotension.
Animal research suggests that baicalein, a constituent of Baikal skullcap, might lower blood pressure.

Likelihood Possible Evidence D
Antithyroid Drugs

Theoretically, concomitant use of Baikal skullcap and antithyroid drugs may result in additive activity and increase the risk of hypothyroidism.
In an animal hyperthyroid model, Baikal skullcap improved levels of triiodothyronine (T3), thyroxine (T4), and thyroid stimulating hormone (TSH). The clinical significance of this effect is unclear.

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

Theoretically, Baikal skullcap may increase levels of drugs metabolized by CYP1A2 enzymes.
In vitro evidence suggests that constituents of Baikal skullcap inhibit the activity of CYP1A2. This effect has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2C19 (Cyp2C19) Substrates

Theoretically, Baikal skullcap might increase levels of drugs metabolized by CYP2C19 enzymes.
In vitro evidence suggest that wogonin, a constituent of Baikal skullcap, modestly inhibits the activity of CYP2C19 enzymes. This effect has not been reported in humans.

Likelihood Possible Evidence D
Estrogens

Theoretically, concomitant use of large amounts of Baikal skullcap might interfere with hormone replacement therapy, due to competition for estrogen receptors.
In vitro evidence suggests that Baikal skullcap has estrogenic activity.

Likelihood Possible Evidence D
Lithium

Theoretically, Baikal skullcap might reduce lithium excretion and increase serum levels of lithium.
Baikal skullcap is thought to have diuretic properties, which may reduce lithium excretion. The dose of lithium might need to be decreased.

Likelihood Possible Evidence D
Alcohol (Ethanol)

Theoretically, Baikal skullcap might potentiate the sedative effects of alcohol.
In vitro and animal research suggests that Baikal skullcap binds to GABA-A receptors and causes sedation. Theoretically, Baikal skullcap might potentiate the sedative effects of alcohol. Preliminary clinical research has not identified clinically relevant sedation after use of Baikal skullcap; however, a thorough evaluation of safety outcomes has not been conducted.

Likelihood Unlikely Evidence D
Cns Depressants

Theoretically, Baikal skullcap might cause additive therapeutic and adverse effects when used concomitantly with drugs with sedative properties.
In vitro and animal research suggests that Baikal skullcap binds to GABA-A receptors and causes sedation. Theoretically, Baikal skullcap might cause additive therapeutic and adverse effects when used concomitantly with drugs with sedative properties. Preliminary clinical research has not identified clinically relevant sedation after use of Baikal skullcap; however, a thorough evaluation of safety outcomes has not been conducted.

Likelihood Unlikely Evidence D
Organic Anion-Transporting Polypeptide Substrates (Oatp)

Theoretically, Baikal skullcap might alter the levels and clinical effects of OATP substrates.
Some pharmacokinetic research shows that baicalin, a constituent of Baikal skullcap, can decrease plasma levels of rosuvastatin. The mechanism is thought to involve stimulation of the activity of the organic anion-transporting polypeptide 1B1 (OATP1B1), which transports rosuvastatin into the liver. This decreases plasma levels of the drug, but increases levels at the site of action in the liver. The degree to which rosuvastatin levels are affected depends on the OATP1B1 haplotype of the individual. Baikal skullcap might also affect other OATP1B1 substrates.

Likelihood Possible Evidence B
P-Glycoprotein Substrates

Theoretically, Baikal skullcap might increase levels of drugs transported by P-glycoprotein.
In vitro and animal research suggests that baicalein, oroxylin A, and wogonin, constituents of Baikal skullcap, can inhibit P-glycoprotein. This effect has not been reported in humans.

Likelihood Possible Evidence D
Scutellaria baicalensis full monograph & interactions

White Peony7 drug types · 813 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, combining peony with anticoagulant or antiplatelet drugs might increase the risk of bleeding.
In vitro research suggests that peony might have antiplatelet, anticoagulant, and antithrombotic effects.

Likelihood Possible Evidence D
Clozapine (Clozaril)

Theoretically, peony might increase the levels and clinical effects of clozapine.
In vitro research shows that peony suppresses the metabolism of clozapine via weak-to-moderate inhibitory effects on cytochromes P450 (CYP) 1A2 and CYP3A4. This effect has not been reported in humans.

Likelihood Possible Evidence D
Contraceptive Drugs

Theoretically, peony might interfere with contraceptive drugs due to competition for estrogen receptors.
In vitro and animal research shows that peony extract has estrogenic activity. Concomitant use might also increase the risk for estrogen-related adverse effects.

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

Theoretically, use of peony may increase the levels and clinical effects of drugs metabolized by CYP1A2.
In vitro research shows that peony suppresses the metabolism of clozapine via weak-to-moderate inhibitory effects on CYP1A2 and CYP3A4. This effect has not been reported in humans.

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

Theoretically, use of peony may increase the levels and clinical effects of drugs metabolized by CYP3A4.
In vitro research shows that peony suppresses the metabolism of clozapine via weak-to-moderate inhibitory effects on CYP1A2 and CYP3A4. This effect has not been reported in humans.

Likelihood Possible Evidence D
Estrogens

Theoretically, concomitant use of large amounts of peony might interfere with hormone replacement therapy and/or increase the risk for estrogen-related adverse effects.
In vitro and animal research shows that peony extract has estrogenic activity. Theoretically, peony might compete for estrogen receptors and/or cause additive estrogenic effects.

Likelihood Possible Evidence D
Phenytoin (Dilantin)

Theoretically, peony might reduce the levels and clinical effects of phenytoin.
Animal research shows that taking peony root reduces levels of phenytoin. Some researchers suggest that peony root might affect cytochrome P450 (CYP) 2C9, which metabolizes phenytoin. However, preliminary research in humans shows that peony root does not alter levels of losartan (Cozaar), which is also metabolized by CYP2C9.

Likelihood Probable Evidence D
White Peony full monograph & interactions

Poria3 drug types · 417 drugs

Anticholinergic Drugs

Theoretically, poria mushroom might decrease the clinical effects of anticholinergic drugs.
In animal research, poria mushroom essential oil reduces acetylcholinesterase activity. This interaction has not been shown in humans.

Likelihood Possible Evidence D
Cholinergic Drugs

Theoretically, poria mushroom might have additive effects when used with cholinergic drugs.
In animal research, poria mushroom essential oil reduces acetylcholinesterase activity. This interaction has not been shown in humans.

Likelihood Possible Evidence D
Cns Depressants

Theoretically, taking poria mushroom extract may enhance the therapeutic and adverse effects of sedatives.
Animal research shows that poria mushroom extract has sedative properties. This interaction has not been shown in humans.

Likelihood Possible Evidence D
Poria full monograph & interactions

Rehmannia2 drug types · 258 drugs

Antidiabetes Drugs

Theoretically, rehmannia might increase the risk of hypoglycemia when taken with antidiabetes drugs.
Animal research shows that rehmannia may have hypoglycemic effects.

Likelihood Possible Evidence D
Antihypertensive Drugs

Theoretically, rehmannia might increase the risk of hypotension when taken with antihypertensive drugs.
Animal research shows that rehmannia may have hypotensive effects. Laboratory research shows that formulations of dried and processed rehmannia root inhibit angiotensin-converting enzyme (ACE).

Likelihood Possible Evidence D
Rehmannia full monograph & interactions
The maker

Brand information

Manufacturer and brand details for 999 Gastro Instant Granules, from the product label.

Ron Teeguarden's Dragon Herbs

See all Ron Teeguarden's Dragon Herbs products
Name
Ron Teeguarden's Dragon Herbs
Street Address
PO Box 361459
City
Los Angeles
State
CA
ZipCode
90036
Web Address
www.dragonherbs.com
Pharmacist Counseling Corner

999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs: Common Questions

Does 999 Gastro Instant Granules by Ron Teeguarden's Dragon Herbs interact with any medications?
Yes. Based on its ingredients, 999 Gastro Instant Granules has a known interaction with 1,429 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
999 Gastro Instant Granules 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.
What is Rehmannia used for in this product?
Rehmannia is a traditional herbal ingredient used in digestive formulas. In our data, it's rated possibly effective for chronic kidney disease, but evidence for other uses — including diabetes support — is insufficient. Talk with your pharmacist about whether it fits your health goals.
Can I take this if I'm on blood pressure medication?
Both Rehmannia and Baikal skullcap may theoretically lower blood pressure further when combined with blood pressure drugs, increasing the risk of dizziness, fainting, or other problems. Check with your pharmacist or doctor before starting — they may need to monitor you or adjust your medication dose.
Is this safe during pregnancy or breastfeeding?
No. Multiple ingredients in this product — Rehmannia, White Peony, Poria, Baikal skullcap, and Evodia — lack enough safety data during pregnancy or breastfeeding, and some are advised against. Talk with your doctor or pharmacist if you're pregnant, planning pregnancy, or nursing.
Does White Peony interfere with birth control?
Yes, theoretically. White Peony has estrogenic activity and may compete with hormone-based contraceptives, potentially reducing their effectiveness or increasing unwanted hormonal effects. Mention this product to your doctor if you're on birth control.
What are the most common side effects?
White Peony and Baikal skullcap can cause gastrointestinal side effects like abdominal bloating, diarrhea, nausea, and constipation. Poria mushroom has rarely caused allergic reactions. Stop and contact your pharmacist if you experience unexpected symptoms.
Can this slow down or speed up how my medications work?
Yes. Evodia can reduce the effectiveness of certain respiratory and other drugs by speeding up how your liver breaks them down. White Peony, Baikal skullcap, and Evodia can affect liver enzymes that metabolize many medications, potentially raising or lowering drug levels. Your pharmacist can check your specific prescriptions.

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

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

999 Gastro Instant Granules label
Go deeper

The Full Monographs Behind 999 Gastro Instant Granules’s Ingredients

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

Herb & supplement monograph

Rehmannia

Interacts with 258 drugs

Rehmannia is a root used for centuries in Traditional Chinese Medicine, often to 'tonify' the kidneys and support energy or blood health. Human evidence for most modern uses is limited, so i...

Read the full Rehmannia monograph → Herb & supplement monograph

Peony

Interacts with 813 drugs

Peony root is a traditional Chinese medicine herb often used for menstrual problems, cramps, and inflammation, frequently as part of combination formulas. Human evidence for most uses is lim...

Read the full Peony monograph → Herb & supplement monograph

Poria Mushroom

Interacts with 417 drugs

Poria mushroom (Fu Ling) is a fungus long used in Traditional Chinese Medicine, mainly as a mild diuretic and digestive and calming aid. Modern scientific evidence in humans is very limited,...

Read the full Poria Mushroom monograph → Herb & supplement monograph

Baikal Skullcap

Interacts with 948 drugs

Baikal skullcap is a traditional Chinese herb (Huang Qin) used for inflammation, allergies, and infections, with active compounds like baicalin and baicalein studied mostly in the lab. Human...

Read the full Baikal Skullcap monograph → Herb & supplement monograph

Evodia

Interacts with 951 drugs

Evodia is a fruit used in traditional Chinese medicine, most often for digestive complaints, headaches, and menstrual pain. Human evidence for these uses is very limited, and it is mostly st...

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Sources

Sources & How We Checked

999 Gastro Instant Granules'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 68 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.

Rehmannia 3 references
  1. Zhang R, Zhou J, Jia Z, et al. Hypoglycemic effect of Rehmannia glutinosa oligosaccharide in hyperglycemic and alloxan-induced diabetic rats and its mechanism. J Ethnopharmacol 2004;90:39-43. PubMed
  2. Zhang RX, Li MX, Jia ZP. Rehmannia glutinosa: review of botany, chemistry and pharmacology. J Ethnopharmacol 2008;117(2):199-214. PubMed
  3. Chao CH, Hsu JL, Chen MF, et al. Anti-hypertensive effects of Radix Rehmanniae and its active ingredients. Nat Prod Res. 2020;34(11):1547-1552.

See these in context on the Rehmannia monograph →

Peony 15 references
  1. Chen LC, Chou MH, Lin MF, Yang LL. Effects of Paeoniae Radix, a traditional Chinese medicine, on the pharmacokinetics of phenytoin. J Clin Pharm Ther 2001;26:271-8. PubMed
  2. Guo TL, Zhou XW. [Clinical observations on the treatment of the gestational hypertension syndrome with Angelica and Paeonia powder]. Zhong Xi Yi Jie He Za Zhi 1986;6:714-6, 707.
  3. Xie HJ, Yasar U, Sandberg M, Rane A. Paeoniae Radix, a traditional Chinese medicine, and CYP2C9 activity. J Clin Pharm Ther 2002;27:229-30. . PubMed
  4. Harada M, Suzuki M, Ozaki Y. Effect of Japanese Angelica root and peony root on uterine contraction in the rabbit in situ. J Pharmacobiodyn 1984;7:304-11. PubMed
  5. Anon. Monograph. Peony (Paeonia spp). Alt Med Rev 2001;6:495-9.
  6. Bruynzeel DP. Contact Dermatitis Due to Paeonia (Peony). Contact Dermatitis 1989; 20:152-3..
  7. Bian, X., Xu, Y., Zhu, L., Gao, P., Liu, X., Liu, S., Qian, M., Gai, M., Yang, J., and Wu, Y. Prevention of maternal-fetal blood group incompatibility with traditional Chinese herbal medicine. Chin Med J (Engl.) 1998;111(7):585-587.
  8. Wong, A. L. and Chan, T. Y. Interaction between warfarin and the herbal product quilinggao. Ann Pharmacother 2003;37(6):836-838.
  9. Cai Y, Yuan Q, Xu K, et al. Assessment of the therapeutic effect of total glycosides of peony for juvenile idiopathic arthritis: a systematic review and meta-analysis. Evid Based Complement Alternat Med 2016;2016:8292486.
  10. Koo YK, Kim JM, Koo JY, et al. Platelet anti-aggregatory and blood anti-coagulant effects of compounds isolated from Paeonia lactiflora and Paeonia suffruticosa. Pharmazie 2010;65(8):624-8.
  11. Wang W, Tian DD, Zheng B, et al. Peony-glycyrrhiza decoction, an herbal preparation, inhibits clozapine metabolism via cytochrome P450s, but not flavin-containing monooxygenase in in vitro models. Drug Metab Dispos 2015;43(7):1147-53. PubMed
  12. Zhou Y, Jin L, Kong F, et al. Clinical and immunological consequences of total glucosides of paeony treatment in Sjögren's syndrome: A randomized controlled pilot trial. Int Immunopharmacol. 2016 Oct;39:314-319. doi: 10.1016/j.intimp.2016.08.006. PubMed
  13. Zhu Q, Qi X, Wu Y, Wang K. Clinical study of total glucosides of paeony for the treatment of diabetic kidney disease in patients with diabetes mellitus. Int Urol Nephrol. 2016 Nov;48(11):1873-1880. doi: 10.1007/s11255-016-1345-5. PubMed
  14. Xu Y, Li X, Chen T, et al. Radix Paeoniae Alba increases serum estrogen level and up-regulates estrogen receptor expression in uterus and vagina of immature/ovariectomized mice. Phytother Res. 2019;33(1):117-29. [RETRACTED].
  15. Liu X, Li X, Li X, et al. The efficacy and safety of total glucosides of peony in the treatment of primary Sjögren's syndrome: a multi-center, randomized, double-blinded, placebo-controlled clinical trial. Clin Rheumatol. 2019;38(3):657-64. Erratum i

See these in context on the Peony monograph →

Poria Mushroom 3 references
  1. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  2. Kim H, Park I, Park K, Park S, Kim YI, Park BG. The positive effects of Poria cocos extract on quality of sleep in insomnia rat models. Int J Environ Res Public Health 2022;19(11):6629. PubMed
  3. Lv Q, Di X, Bian B, Li K, Guo J. Neuroprotective effects of Poria cocos (Agaricomycetes) essential oil on Aß1-40-induced learning and memory deficit in rats. Int J Med Mushrooms 2022;24(10):73-82.

See these in context on the Poria Mushroom monograph →

Baikal Skullcap 34 references
  1. Huang KC. The pharmacology of Chinese herbs. 2nd ed. New York, NY: CRC Press LLC. 1999;385-6, 400-1.
  2. Hui KM, Wang XH, Xue H. Interaction of flavones from the roots of Scutellaria baicalensis with the benzodiazepine site. Planta Med 2000;66:91-3.
  3. Liao JF, Wang HH, Chen MC, et al. Benzodiazepine binding site-interactive flavones from Scutellaria baicalensis root. Planta Med 1998;64:571-2.
  4. Nishioka T, Kawabata J, Aoyama Y. Baicalein, an alpha-glucosidase inhibitor from Scutellaria baicalensis. J Nat Prod 1998;61:1413-5.
  5. Zhang CZ, Wang SX, Zhang Y, et al. In vitro estrogenic activities of Chinese medicinal plants traditionally used for the management of menopausal symptoms. J Ethnopharmacol 2005;98:295-300. PubMed
  6. Fan L, Zhang W, Guo D, et al. The effect of herbal medicine baicalin on pharmacokinetics of rosuvastatin, substrate of organic anion-transporting polypeptide 1B1. Clin Pharmacol Ther 2007;83:471-6. PubMed
  7. Chen C, Mireles RJ, Campbell SD, et al. Differential interaction of 3-hydroxy-3-methylglutaryl-CoA reductase inhibitors with ABCB1, ABCC2, and OATP1B1. Drug Metab Dispos 2005;33:537-46. PubMed
  8. Pasanen MK, Fredrikson H, Neuvonen PJ, Niemi M. Different effects of SLCO1B1 polymorphism on the pharmacokinetics of atorvastatin and rosuvastatin. Clin Pharmacol Ther 2007;82:726-33. PubMed
  9. Konig J, Seithel A, Gradhand U, Fromm MF. Pharmacogenomics of human OATP transporters. Naunyn-Schmiedeberg Arch Pharmacol 2006;372:432-43. PubMed
  10. Chalasani N, Vuppalanchi R, Navarro V, et al. Acute liver injury due to flavocoxid (Limbrel), a medical food for osteoarthritis: a case series. Ann Intern Med 2012;156:857-60. PubMed
  11. Reichenbach S, Juni P. Medical food and food supplements: not always as safe as generally assumed. Ann Intern Med 2012;156:894-5. PubMed
  12. Huang, W. M., Yan, J., and Xu, J. [Clinical and experimental study on inhibitory effect of sanhuang mixture on platelet aggregation]. Zhongguo Zhong.Xi.Yi.Jie.He.Za Zhi. 1995;15(8):465-467.
  13. Kim, B. R., Kim, D. H., Park, R., Kwon, K. B., Ryu, D. G., Kim, Y. C., Kim, N. Y., Jeong, S., Kang, B. K., and Kim, K. S. Effect of an extract of the root of Scutellaria baicalensis and its flavonoids on aflatoxin B1 oxidizing cytochrome P450 enzymes. Pl PubMed
  14. Lee, Y., Yeo, H., Liu, S. H., Jiang, Z., Savizky, R. M., Austin, D. J., and Cheng, Y. C. Increased anti-P-glycoprotein activity of baicalein by alkylation on the A ring. J Med Chem 10-21-2004;47(22):5555-5566. PubMed
  15. Huang, Y., Tsang, S. Y., Yao, X., and Chen, Z. Y. Biological properties of baicalein in cardiovascular system. Curr Drug Targets.Cardiovasc.Haematol.Disord 2005;5(2):177-184. PubMed
  16. Lee, E., Enomoto, R., Suzuki, C., Ohno, M., Ohashi, T., Miyauchi, A., Tanimoto, E., Maeda, K., Hirano, H., Yokoi, T., and Sugahara, C. Wogonin, a plant flavone, potentiates etoposide-induced apoptosis in cancer cells. Ann N Y Acad Sci 2007;1095:521-526. PubMed
  17. Waisundara, V. Y., Hsu, A., Huang, D., and Tan, B. K. Scutellaria baicalensis enhances the anti-diabetic activity of metformin in streptozotocin-induced diabetic Wistar rats. Am J Chin Med 2008;36(3):517-540.
  18. Go, W. J., Ryu, J. H., Qiang, F., and Han, H. K. Evaluation of the flavonoid oroxylin A as an inhibitor of P-glycoprotein-mediated cellular efflux. J Nat Prod 2009;72(9):1616-1619. PubMed
  19. Linnebur, S. A., Rapacchietta, O. C., and Vejar, M. Hepatotoxicity associated with chinese skullcap contained in Move Free Advanced dietary supplement: two case reports and review of the literature. Pharmacotherapy 2010;30(7):750, 258e-750, 262e. PubMed
  20. Enomoto, R., Koshiba, C., Suzuki, C., and Lee, E. Wogonin potentiates the antitumor action of etoposide and ameliorates its adverse effects. Cancer Chemother.Pharmacol 2011;67(5):1063-1072. PubMed
  21. Chang, H. H., Yi, P. L., Cheng, C. H., Lu, C. Y., Hsiao, Y. T., Tsai, Y. F., Li, C. L., and Chang, F. C. Biphasic effects of baicalin, an active constituent of Scutellaria baicalensis Georgi, in the spontaneous sleep-wake regulation. J Ethnopharmacol. 5- PubMed
  22. Li, T., Li, N., Guo, Q., Ji, H., Zhao, D., Xie, S., Li, X., Qiu, Z., Han, D., Chen, X., and You, Q. Inhibitory effects of wogonin on catalytic activity of cytochrome P450 enzyme in human liver microsomes. Eur J Drug Metab Pharmacokinet. 6-29-2011; PubMed
  23. Lin H, Zhou J, Lin K, et al. Efficacy of Scutellaria baicalensis for the treatment of hand, foot, and mouth disease associated with encephalitis in patients infected with EV71: a multicenter, retrospective analysis. Biomed Res Int 2016;2016:5697571.
  24. Papafragkakis C, Ona MA, Reddy M, Anand S. Acute hepatitis after ingestion of a preparation of Chinese skullcap and black catechu for joint pain. Case Reports Heptal 2016;2016:4356749. PubMed
  25. Kim M, Lee BC. Therapeutic effect of Scutellaria baicalensis on L-thyroxine-induced hyperthyroidism rats. Evid Based Complement Alternat Med. 2019;2019:3239649.
  26. Braude MR, Bassily R. Drug-induced liver injury secondary to Scutellaria baicalensis (Chinese skullcap). Intern Med J. 2019;49(4):544-546. PubMed
  27. Shin NR, Gu N, Choi HS, Kim H. Combined effects of Scutellaria baicalensis with metformin on glucose tolerance of patients with type 2 diabetes via gut microbiota modulation. Am J Physiol Endocrinol Metab. 2020;318(1):E52-E61.
  28. Li WJ, Bao J, Zheng DC, et al. Treatments of Peyronie's disease with Scutellaria baicalensis and surgery according to the disease course: a single-center retrospective study of 261 patients. Ann Palliat Med. 2021 Mar;10(3):2979-2989. PubMed
  29. Adam T, Bursztejn AC, Schmutz JL. Facial eczema from a sunscreen: Scutellaria baicalensis, a novel allergen beginning to attract attention. Contact Dermatitis. 2020 Apr;82(4):253-254.
  30. Luna-Bastante L, Gatica-Ortega ME, Pastor-Nieto MA, et al. Allergic contact dermatitis to Tinosorb S, Scutellaria baicalensis, and other emerging allergens in cosmetics. Contact Dermatitis. 2020 May;82(5):307-309.
  31. US Food and Drug Administration (FDA). FDA Alerts Consumers About Potentially Life-Threatening Health Problems Linked to Limbrel. December 19, 2017. Available at: https://www.fda.gov/food/alerts-advisories-safety-information/fda-alerts-consumers-about-pot
  32. Li L, Gao H, Lou K, et al. Safety, tolerability, and pharmacokinetics of oral baicalein tablets in healthy Chinese subjects: A single-center, randomized, double-blind, placebo-controlled multiple-ascending-dose study. Clin Transl Sci 2021;14(5):2017-2024. PubMed
  33. Badaoui A. Allergic contact dermatitis to resveratrol and Scutellaria baicalensis root extract in a cosmetic product. Contact Dermatitis 2022.
  34. Nogami T, Arai M. Incidence of Herb-induced Liver Injury Caused by Kampo Formulae Containing Scutellariae Radix. Tokai J Exp Clin Med 2022;47(3):94-98.

See these in context on the Baikal Skullcap monograph →

Evodia 13 references
  1. Sheu JR, Kan YC, Hung WC, et al. The antiplatelet activity of rutaecarpine, an alkaloid isolated from Evodia rutaecarpa, is mediated through inhibition of phospholipase C. Thromb Res 1998;92:53-64. PubMed
  2. Sheu JR, Hung WC, Lee YM, Yen MH. Mechanism of inhibition of platelet aggregation by rutaecarpine, an alkaloid isolated from Evodia rutaecarpa. Eur J Pharmacol 1996;318:469-75. PubMed
  3. Ueng YF, Tsai TH, Don MJ, et al. Alteration of the pharmacokinetics of theophylline by rutaecarpine, an alkaloid of the medicinal herb Evodia rutaecarpa, in rats. J Pharm Pharmacol 2005;57:227-32.
  4. King CL, Kong YC, Wong NS, et al. Uterotonic effect of Evodia rutaecarpa alkaloids. J Nat Prod 1980;43:577-82. PubMed
  5. Ueng YF, Jan WC, Lin LC, et al. The alkaloid rutaecarpine is a selective inhibitor of cytochrome P450 1A in mouse and human liver microsomes. Drug Metab Dispos 2002;30:349-53. PubMed
  6. Iwata H, Tezuka Y, Kadota S, et al. Mechanism-based inactivation of human liver microsomal CYP3A4 by rutaecarpine and limonin from Evodia fruit extract. Drug Metab Pharmacokinet 2005;20:34-45. PubMed
  7. Sheu JR, Hung WC, Wu CH, et al. Antithrombotic effect of rutaecarpine, an alkaloid isolated from Evodia rutaecarpa, on platelet plug formation in in vivo experiments. Br J Haematol 2000;110:110-5.
  8. Tsai TH, Chang CH, Lin LC. Effects of Evodia rutaecarpa and rutaecarpine on the pharmacokinetics of caffeine in rats. Planta Med 2005;71:640-5.
  9. Lee SK, Kim NH, Lee J, et al. Induction of cytochrome P450s by rutaecarpine and metabolism of rutaecarpine by cytochrome P450s. Planta Med 2004;70:753-7. PubMed
  10. Baburin I, Varkvisser R, Schramm A, et al. Dehydroevodiamine and hortiamine, alkaloids from the traditional Chinese herbal drug Evodia rutaecarpa, are IKr blockers with proarrhythmic effects in vitro and in vivo. Pharmacol Res. 2018 May;131:150-163. DOI
  11. Zhang W, Guo J, Wang D, et al. Effect of CYP3A inducer/inhibitor on pharmacokinetics of five alkaloids in Evodiae Fructus. Chem Biol Interact 2020;327:109146. PubMed
  12. Huang CJ, Huang WC, Lin WT, et al. Rutaecarpine, an alkaloid from Evodia rutaecarpa, can prevent platelet activation in humans and reduce microvascular thrombosis in mice: crucial role of the PI3K/Akt/GSK3ß signal axis through a cyclic nucleotides/VASP-in
  13. Bista SR, Lee SK, Thapa D, et al. Effects of oral rutaecarpine on the pharmacokinetics of intravenous chlorzoxazone in rats. Toxicol Res 2008;24(3):195-9. PubMed

See these in context on the Evodia monograph →

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.

© 2021 Therapeutic Research Center, LLC

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