Cranberry Ingredients & Drug Interactions
by Hawaii Pharm
What is this page for?
First and foremost: checking Cranberry 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
Cranberry is a dietary supplement by Hawaii Pharm with 1 active ingredient. Its ingredients are commonly taken for urinary tract infection prevention, bladder health, antioxidant support.Based on those ingredients, 712 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Cranberry Berry Extract, Dry. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Cranberry by Hawaii Pharm
Ask about any prescription or over-the-counter medication and we check it for interactions with Cranberry by Hawaii Pharm — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Cranberry by Hawaii Pharm
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.
What’s inside
Full disclosure
This product contains one active ingredient: Cranberry Berry Extract, Dry. It's a concentrated form of cranberry, the red berry often used in juices and supplements for urinary tract health.
Does it work?
Moderate evidence
Cranberry is possibly effective for preventing urinary tract infections (UTIs). For other uses — including age-related cognitive decline, benign prostate enlargement, cancer prevention, fatty liver disease, and chronic fatigue — the evidence in our data is insufficient to rate whether it works.
How safe is it?
Well-documented data
Cranberry from food sources is generally well tolerated. The most common side effects from oral use are diarrhea and stomach discomfort, especially in large doses — the data notes that 3 to 4 liters of juice per day can trigger significant gastrointestinal upset, particularly in young children.
Skin redness and itching have been reported rarely. Concentrated supplement doses haven't been as thoroughly studied as food amounts, so talk with your provider before starting, especially if you're using a supplement rather than eating cranberry or drinking juice.
Cranberry is likely safe in pregnancy and during breastfeeding, though concentrated supplements are less well studied than food amounts.
Meds to double-check
Moderate interaction found
Before taking this cranberry supplement, double-check with your doctor or pharmacist if you take blood thinners like warfarin (Moderate risk), cholesterol-lowering statins like atorvastatin (Moderate), or blood pressure medications like nifedipine (Moderate). Pain relievers like diclofenac and other drugs processed through CYP2C9 enzymes carry Minor documented interaction risk.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.
This product may help prevent urinary tract infections, but it interacts with blood thinners, cholesterol medications, and blood pressure drugs — sometimes significantly. If you take warfarin, atorvastatin, nifedipine, or any other prescription medication, check your exact drugs with the tool on this page before starting.
Talk with your doctor or pharmacist about whether cranberry is right for you.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Oct 24, 2023.
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
General information
Key facts about Cranberry, straight from the product label.
| Brand | Hawaii Pharm |
|---|---|
| Barcode (UPC) | 840253616692 |
| Net contents | 4 Fluid Ounce(s); 120 mL |
| Market status | On market |
| Date entered into DSLD | Oct 24, 2023 |
| DSLD ID | 301500 |
| Product type | Botanical |
| Supplement form | Liquid |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Gluten Free |
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 Cranberry by Hawaii Pharm, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Cranberry Berry Extract, Dry | 983 mg | -- |
Other ingredients: Alcohol, Water, Glycerin
Tap any ingredient to jump to its full detail below.
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)
Hawaii Pharm Herbal Extract Highest quality since 2008
Suggested/Recommended/Usage/Directions
Suggested use: Shake well before using. For adults add about 20-30 drops (0.7-1 mL, one full squeeze of the dropper bulb) to some juice or water, up to 4 times a day.
Precautions
Warning: We recommend to seek expert medical advice before taking.
Do not use if you are allergic to any ingredients.
Consult your physician before giving to children under 18, during pregnancy, if nursing or taking medications.
Consult your physician before giving to children under 18, during pregnancy, if nursing or taking medications.
May affect the ability to drive and operate machinery. May have contraindications, can cause side effects and adverse reactions. Do not use if seal is broken or missing.
Keep out of the reach of children!
Storage
Store in a cool dry place.
Seals/Symbols
cGMP Made in compliance with cGMP 21 CFR 111 in an FDA registered and inspected facility.
Organic Alcohol Based USA Made in United States of America
FDA Disclaimer Statement
This product has not been evaluated by the FDA and is not intended to diagnose, treat, cure or prevent any disease.
General Statements
Scan this QR-code to get 15% discount on your next purchase. Limited time deal.
Formula
Vaccinium macrocarpon
Organic Alcohol Based
Formulation
Only natural ingredients Purity is laboratory tested and verified
All the raw materials are gluten-free by their nature No artificial colors, flavors, or preservatives
Not tested on animals
Organic Alcohol Based
Made in USA, Hawaii
FDA Statement of Identity
Herbal Supplement
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Cranberry by Hawaii Pharm label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
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)The Ingredients in Cranberry by Hawaii Pharm
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size0.7 mL Dosage formLiquid Servings per container120 Amounts shown are per serving.
Cranberry Berry Extract, Dry
Interacts with712 drugs
Cranberry is best known for helping to prevent repeated urinary tract infections (UTIs) in some people, and the evidence here is moderate but mixed. I...
Cranberry Berry Extract, Dry monograph & interactionsOther (inactive) ingredients: Alcohol, Water, Glycerin. These complete the product’s ingredient list but are not active constituents.
Cranberry by Hawaii Pharm Drug Interactions
HelloPharmacist Interaction Report
Hawaii Pharm Cranberry has documented interactions with several medication types.
The most serious concern is with blood thinners (anticoagulants) like warfarin — cranberry may increase how much warfarin stays in your body, which could raise your bleeding risk. The evidence here is mixed, but case reports have linked cranberry juice to higher INR levels (a measure of how thin your blood is) in people taking warfarin.
Read the full breakdown — every affected drug type, severity by severity
Cranberry also interacts with cholesterol-lowering statins like atorvastatin and with blood pressure medications like nifedipine. Both are Moderate-severity interactions — cranberry may slow how your liver breaks these drugs down, raising their levels and side effects.
A case report described one person on atorvastatin who developed muscle breakdown and liver problems after drinking cranberry juice daily for 2 weeks. With nifedipine, animal research shows cranberry can nearly double drug levels in the bloodstream.
Minor interactions are documented with pain relievers like diclofenac and with a broader class of drugs your liver metabolizes through CYP2C9 enzymes, though human research on these is mixed. Altogether, these interactions span 713 individual medications.
Use the medication checker on this page to look up your exact drugs before starting.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Cranberry?
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 checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Cranberry interact with 712 drugs. Click any drug to see the details.
1 of the 1 ingredient in Cranberry interact with drugs. Each result below shows which ingredient is responsible. Cranberry Berry Extract, Dry
ApremilastOtezla
How Apremilast interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Apremilast interactionAprepitantCinvanti, Emend
How Aprepitant interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aprepitant interactionAripiprazoleAbilify, Abilify Maintena, Abilify Mycite
How Aripiprazole interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aripiprazole interactionAripiprazole LauroxilAristada, Aristada Initio Kit
How Aripiprazole Lauroxil interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aripiprazole Lauroxil interactionArmodafinilNuvigil
How Armodafinil interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Armodafinil interactionAspirin, Butalbital, CaffeineFiorinal
How Aspirin, Butalbital, Caffeine interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Butalbital, Caffeine interactionAspirin, Butalbital, Caffeine, Codeine PhosphateFiorinal w/ Codeine
How Aspirin, Butalbital, Caffeine, Codeine Phosphate interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Butalbital, Caffeine, Codeine Phosphate interactionAspirin, Butalbital, Caffeine, PhenacetinMarnal
How Aspirin, Butalbital, Caffeine, Phenacetin interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Butalbital, Caffeine, Phenacetin interactionAspirin, CaffeineAnacin
How Aspirin, Caffeine interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine interactionAspirin, Caffeine, Codeine PhosphateAnacin w/ Codeine
How Aspirin, Caffeine, Codeine Phosphate interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine, Codeine Phosphate interactionAspirin, Caffeine, Dihydrocodeine BitartrateSynalgos DC
How Aspirin, Caffeine, Dihydrocodeine Bitartrate interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine, Dihydrocodeine Bitartrate interactionAspirin, Caffeine, Dover's PwdAcedoval, Dovacet
How Aspirin, Caffeine, Dover's Pwd interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine, Dover's Pwd interactionAspirin, Caffeine, HydrocodoneDamason-P
How Aspirin, Caffeine, Hydrocodone interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine, Hydrocodone interactionAspirin, Caffeine, Isobutylallylbarbituric Acid, PhenacetinLanorinal
How Aspirin, Caffeine, Isobutylallylbarbituric Acid, Phenacetin interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine, Isobutylallylbarbituric Acid, Phenacetin interactionAspirin, Caffeine, OrphenadrineInvagesic, Invagesic Forte, Norgesic, Norgesic Forte, Orphengesic, Orphengesic Forte
How Aspirin, Caffeine, Orphenadrine interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine, Orphenadrine interactionAspirin, Caffeine, Phenacetin, PropoxypheneMargesic Comp. 65
How Aspirin, Caffeine, Phenacetin, Propoxyphene interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Caffeine, Phenacetin, Propoxyphene interactionAspirin, Chlorpheniramine, PhenylpropanolamineAlka-Seltzer Plus Cold
How Aspirin, Chlorpheniramine, Phenylpropanolamine interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Chlorpheniramine, Phenylpropanolamine interactionAspirin, HydrocodoneAlor 5 500, Lortab ASA
How Aspirin, Hydrocodone interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Hydrocodone interactionAspirin, OmeprazoleYosprala
How Aspirin, Omeprazole interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 2c9 (cyp2c9) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP2C9 substrates.
Read the full Cranberry Berry Extract, Dry + Aspirin, Omeprazole interactionAtazanavirReyataz
How Atazanavir interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Atazanavir interactionAtazanavir, CobicistatEvotaz
How Atazanavir, Cobicistat interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Atazanavir, Cobicistat interactionAtogepantQulipta
How Atogepant interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Atogepant interactionAtorvastatinAtorvaliq
How Atorvastatin interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryAtorvastatin (lipitor), Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase levels and adverse effects of atorvastatin.
Read the full Cranberry Berry Extract, Dry + Atorvastatin interactionAtorvastatin CalciumLipitor
How Atorvastatin Calcium interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryAtorvastatin (lipitor), Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase levels and adverse effects of atorvastatin.
Read the full Cranberry Berry Extract, Dry + Atorvastatin Calcium interactionAtropine, Chlorpheniramine, Hyoscyamine, Phenylephrine, Phenylpropanolamine, ScopolamineAtrohist Plus, Pro Tuss, Ru-tuss, Stahist
How Atropine, Chlorpheniramine, Hyoscyamine, Phenylephrine, Phenylpropanolamine, Scopolamine interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Atropine, Chlorpheniramine, Hyoscyamine, Phenylephrine, Phenylpropanolamine, Scopolamine interactionAvacopanTavneos
How Avacopan interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Avacopan interactionAvanafilStendra
How Avanafil interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Avanafil interactionAvapritinibAyvakit
How Avapritinib interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Avapritinib interactionAxitinibInlyta
How Axitinib interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Axitinib interactionAzelastine Hydrochloride, Fluticasone PropionateDymista
How Azelastine Hydrochloride, Fluticasone Propionate interacts with Cranberry — through 1 ingredient. Tap an ingredient for the detail:
Cranberry Berry Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
Read the full Cranberry Berry Extract, Dry + Azelastine Hydrochloride, Fluticasone Propionate interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Cranberry with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.
Cranberry Berry Extract, Dry
Atorvastatin (Lipitor)
Theoretically, cranberry might increase levels and adverse effects of atorvastatin.
In one case report, a patient taking atorvastatin experienced upper back pain, rhabdomyolysis, and abnormal liver function after drinking cranberry juice 16 ounces daily for 2 weeks. Theoretically, this may have been caused by inhibition of cytochrome P450 3A4 (CYP3A4) enzymes by cranberry juice, as atorvastatin is a CYP3A4 substrate. Creatinine kinase and liver enzymes normalized within 2 weeks of stopping cranberry juice. Patients taking atorvastatin should avoid large quantities of cranberry juice.
Cytochrome P450 3A4 (Cyp3A4) Substrates
Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.
A case of upper back pain, rhabdomyolysis, and abnormal liver function has been reported for a patient taking atorvastatin, a CYP3A4 substrate, in combination with cranberry juice 16 ounces daily for 2 weeks. Creatinine kinase and liver enzymes normalized within 2 weeks of stopping cranberry juice. Also, animal research suggests that cranberry juice, administered intraduodenally 30 minutes prior to nifedipine, a CYP3A4 substrate, inhibits nifedipine metabolism and increases the area under the concentration-time curve by 1.6-fold compared to control.
Nifedipine (Procardia)
Theoretically, cranberry might increase the levels and adverse effects of nifedipine.
Animal research suggests that cranberry juice, administered intraduodenally 30 minutes prior to nifedipine treatment, inhibits nifedipine metabolism and increases the area under the concentration-time curve by 1.6-fold compared to control. This interaction has not been reported in humans.
Warfarin (Coumadin)
Theoretically, cranberry might increase the levels and adverse effects of warfarin. However, research is conflicting.
There is contradictory evidence about the effect of cranberry juice on warfarin. Case reports have linked cranberry juice consumption to increases in the international normalized ratio (INR) in patients taking warfarin, resulting in severe spontaneous bleeding and excessive postoperative bleeding. Daily consumption of cranberry sauce for one week has also been linked to an increase in INR in one case report. In a small study in healthy young males, taking a high dose of 3 grams of cranberry juice concentrate capsules, equivalent to 57 grams of fruit daily, for 2 weeks produced a 30% increase in the area under the INR-time curve after a single 25-mg dose of warfarin. However, 3 very small clinical studies in patients stabilized on warfarin reported that cranberry juice 250 mL once or twice daily for 7 days (27% cranberry juice or pure cranberry juice) or 240 mL once daily for 14 days does not significantly increase INR or affect plasma warfarin levels. The reasons for these discrepant findings are unclear. It is possible that the form and dose of cranberry may play a role, as cranberry extracts and juices contain different constituents. Additionally, an in vitro study evaluating 5 different cranberry juices found varying effects, with only a cranberry concentrate, and not diluted cranberry juices, inhibiting CYP2C9. However, this concentrate did not inhibit CYP2C9 activity in humans.
Cytochrome P450 2C9 (Cyp2C9) Substrates
Theoretically, cranberry might increase the levels and adverse effects of CYP2C9 substrates. However, research is conflicting.
There is contradictory evidence about the effect of cranberry on CYP2C9 enzymes. In vitro evidence suggests that flavonoids in cranberry inhibit CYP2C9 enzymes. However, clinical research shows that cranberry juice does not significantly affect the levels, metabolism, or elimination of the CYP2C9 substrates flurbiprofen or diclofenac. Also, in patients stabilized on warfarin, drinking cranberry juice 250 mL daily for 7 days does not significantly increase the anticoagulant activity of warfarin, a CYP2C9 substrate. Additional pharmacokinetic research shows that cranberry juice does not increase peak plasma concentrations or area under the concentration-time curve of warfarin.
Diclofenac (Voltaren, Others)
Theoretically, cranberry might modestly increase the levels and adverse effects of diclofenac.
In vitro evidence suggests that cranberry juice inhibits diclofenac metabolism by human liver microsomes. However, drinking cranberry juice does not seem to affect diclofenac metabolism in humans.
Brand information
Manufacturer and brand details for Cranberry, from the product label.
Hawaii Pharm
See all Hawaii Pharm products- Name
- Hawaii Pharm LLC
- Street Address
- 510 Sumner St. Ste. 613
- City
- Honolulu
- State
- HI
- ZipCode
- 96817
- Phone Number
- 888-854-2924
- Web Address
- www.hawaiipharm.com
Cranberry by Hawaii Pharm: Common Questions
Does Cranberry by Hawaii Pharm interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Will this actually prevent a UTI?
What are the side effects?
Is this safe during pregnancy or breastfeeding?
Why does this interact with so many medications?
Does this product have fillers?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Cranberry is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
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.
The Full Monographs Behind Cranberry’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
Cranberry'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.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
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 33 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.
Cranberry 33 references
- Anon. Possible interaction between warfarin and cranberry juice. Current Problems in Pharmacovigilance 2003;29:8. PubMed
- Greenblatt DJ, von Moltke LL, Perloff ES, et al. Interaction of flurbiprofen with cranberry juice, grape juice, tea, and fluconazole: in vitro and clinical studies. Clin Pharmacol Ther 2006;79:125-33. PubMed
- Hodek P, Trefil P, Stiborova M. Flavonoids-potent and versatile biologically active compounds interacting with cytochromes P450. Chem Biol Interact 2002;139:1-21.. PubMed
- Grant P. Warfarin and cranberry juice: An interaction? J Heart Valve Dis 2004;13:25-6.
- Suvarna R, Pirmohamed M, Henderson L. Possible interaction between warfarin and cranberry juice. BMJ 2003;327:1454. PubMed
- Li Z, Seeram NP, Carpenter CL, et al. Cranberry does not affect prothrombin time in male subjects on warfarin. J Am Diet Assoc 2006;106:2057-61. PubMed
- Lilja JJ, Backman JT, Neuvonen PJ. Effects of daily ingestion of cranberry juice on the pharmacokinetics of warfarin, tizanidine, and midazolam - probes of CYP2C9, CYP1A2 and CYP3A4. Clin Pharmacol The 2007:81:833-9. PubMed
- Wing DA, Rumney PJ, Preslicka CW, Chung JH. Daily cranberry juice for the prevention of asymptomatic bacteriuria in pregnancy: a randomized, controlled pilot study. J Urol 2008;180:1367-72. PubMed
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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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