Herb & supplement monograph

Cocoa Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Cocoa interacts with medications. The heart of this page is the interaction list — every drug Cocoa is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Cocoa is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Cocoa Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Cocoa drug interaction appears low for most people. None of the listed interactions are rated major, and nearly all trace back to cocoa's caffeine content, with much of the evidence theoretical or based on limited studies.

Interactions deserving the most attention

The best-documented concern is theophylline, because caffeine can noticeably slow how the body clears it and raise its levels. Cocoa should also be avoided before heart stress tests using dipyridamole or adenosine, since caffeine can blunt their effects. People on anticoagulant or antiplatelet drugs should know cocoa may add to blood-thinning effects and increase bleeding tendency. Stimulant medicines, quinolone antibiotics, and blood pressure drugs also deserve some awareness, mostly when large amounts of cocoa are consumed.

What the rest of the list means

A long list of interactions does not mean every combination is harmful. Most entries here are theoretical, predicted from caffeine's effects on the body or on enzymes the body uses to clear certain medications, and several apply only to large amounts. In some cases, such as adenosine, the predicted effect has not turned out to matter in people.

Check your medications against Cocoa

Based on HelloPharmacist’s Cocoa interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Cocoa

661 medications have a known interaction with Cocoa, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Cocoa using our pharmacist-reviewed interaction data.

AI summaries are generated from our Cocoa interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Cocoa combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Cocoa affects

Every type of medication (drug category) Cocoa is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 37 drug categories Cocoa interacts with

Ace Inhibitors (aceis)Adenosine (adenocard)Alcohol (ethanol)Anticoagulant/antiplatelet DrugsAntihypertensive DrugsBeta-adrenergic AgonistsCytochrome P450 1a2 (cyp1a2) InhibitorsDipyridamole (persantine)Disulfiram (antabuse)Diuretic DrugsEphedrineEstrogensFlutamide (eulexin)Fluvoxamine (luvox)LithiumMonoamine Oxidase Inhibitors (maois)NicotinePentobarbital (nembutal)Phenobarbital (luminal)PhenylpropanolaminePhenytoin (dilantin)Quinolone AntibioticsRiluzole (rilutek)Stimulant DrugsTheophyllineValproateVerapamil (calan, Others)Cimetidine (tagamet)Contraceptive DrugsFluconazole (diflucan)Methoxsalen (oxsoralen)Metmorphin (glucophage)Mexiletine (mexitil)PhenothiazinesTerbinafine (lamisil)Tiagabine (gabitril)Ticlopidine (ticlid)

Ace Inhibitors (Aceis)

Theoretically, taking cocoa with ACEIs might increase the risk of adverse effects.
Human research shows that dark chocolate can inhibit ACE. Additionally, prolonged angioedema in an elderly patient on an ACE inhibitor was precipitated with intake of diabetic chocolate.

Likelihood Possible Evidence D

Adenosine (Adenocard)

Theoretically, cocoa might decrease the vasodilatory effects of adenosine and interfere with its use prior to stress testing.
Cocoa contains caffeine. Caffeine is a competitive inhibitor of adenosine at the cellular level. However, caffeine does not seem to affect supplemental adenosine because high interstitial levels of adenosine overcome the antagonistic effects of caffeine. It is recommended that methylxanthines and methylxanthine-containing products be stopped 24 hours prior to pharmacological stress tests. However, methylxanthines appear more likely to interfere with dipyridamole than adenosine-induced stress testing.

Likelihood Possible Evidence B

Alcohol (Ethanol)

Theoretically, concomitant use might increase levels and adverse effects of caffeine.
Cocoa contains caffeine. Alcohol reduces caffeine metabolism. Concomitant use of alcohol can increase caffeine serum concentrations and the risk of caffeine adverse effects.

Likelihood Probable Evidence D

Anticoagulant/Antiplatelet Drugs

Theoretically, cocoa may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Clinical research shows that intake of cocoa can inhibit platelet adhesion, aggregation, and activity and increase aspirin-induced bleeding time. For patients on dual antiplatelet therapy, cocoa may enhance the inhibitory effect of clopidogrel, but not aspirin, on platelet aggregation.

Likelihood Possible Evidence D

Antihypertensive Drugs

Theoretically, taking cocoa with antihypertensive drugs might increase the risk of hypotension.
Clinical research shows that cocoa can modestly decrease blood pressure in hypertensive and normotensive patients.

Likelihood Possible Evidence D

Beta-Adrenergic Agonists

Theoretically, large amounts of cocoa might increase the cardiac inotropic effects of beta-agonists.
Cocoa contains caffeine. Theoretically, large amounts of caffeine might increase cardiac inotropic effects of beta-agonists. A case of atrial fibrillation associated with consumption of large quantities of chocolate in a patient with chronic albuterol inhalation abuse has also been reported.

Likelihood Probable Evidence D

Cytochrome P450 1A2 (Cyp1A2) Inhibitors

Theoretically, concomitant use might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Caffeine is metabolized by cytochrome P450 1A2 (CYP1A2),. Theoretically, drugs that inhibit CYP1A2 may decrease the clearance rate of caffeine from cocoa and increase caffeine levels.

Likelihood Possible Evidence D

Dipyridamole (Persantine)

Theoretically, cocoa might decrease the vasodilatory effects of dipyridamole and interfere with its use prior to stress testing.
Cocoa contains caffeine. Caffeine may inhibit dipyridamole-induced vasodilation. It is recommended that methylxanthines and methylxanthine-containing products be stopped 24 hours prior to pharmacological stress tests. Methylxanthines appear more likely to interfere with dipyridamole than adenosine-induced stress testing.

Likelihood Probable Evidence B

Disulfiram (Antabuse)

Theoretically, disulfiram might increase the risk of adverse effects from caffeine.
Cocoa contains caffeine. In human research, disulfiram decreases the rate of caffeine clearance.

Likelihood Probable Evidence B

Diuretic Drugs

Theoretically, using cocoa with diuretic drugs might increase the risk of hypokalemia.
Cocoa contains caffeine. In excessive amounts, caffeine can reduce potassium levels due to stimulation of the sodium-potassium pump. Diuretics can also cause lower potassium levels.

Likelihood Possible Evidence D

Ephedrine

Theoretically, concomitant use might increase the risk for stimulant adverse effects.
Cocoa contains caffeine. There is evidence that using ephedrine with caffeine might increase the risk of serious life-threatening or debilitating adverse effects such as hypertension, myocardial infarction, stroke, seizures, and death.

Likelihood Possible Evidence D

Estrogens

Theoretically, estrogens might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Estrogen inhibits caffeine metabolism.

Likelihood Probable Evidence B

Flutamide (Eulexin)

Theoretically, cocoa might increase the levels and adverse effects of flutamide.
Cocoa contains caffeine. In vitro evidence suggests that caffeine can inhibit the metabolism of flutamide.

Likelihood Possible Evidence D

Fluvoxamine (Luvox)

Theoretically, fluvoxamine might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Fluvoxamine reduces caffeine metabolism.

Likelihood Probable Evidence D

Lithium

Theoretically, abrupt cocoa withdrawal might increase the levels and adverse effects of lithium.
Cocoa contains caffeine. There are two case reports of lithium tremor that worsened upon abrupt coffee withdrawal.

Likelihood Possible Evidence D

Monoamine Oxidase Inhibitors (Maois)

Theoretically, concomitant use might increase the risk of a hypertensive crisis.
Cocoa contains caffeine. Large amounts of caffeine with MAOIs might precipitate a hypertensive crisis.

Likelihood Possible Evidence D

Nicotine

Theoretically, concomitant use might increase the risk of hypertension.
Cocoa contains caffeine. Concomitant use of caffeine and nicotine has been shown to have additive cardiovascular effects, including increased heart rate and blood pressure. Blood pressure was increased by 10.8/12.4 mmHg when the agents were used concomitantly.

Likelihood Probable Evidence B

Pentobarbital (Nembutal)

Theoretically, cocoa might decrease the effects of pentobarbital.
Cocoa contains caffeine. Caffeine might negate the hypnotic effects of pentobarbital.

Likelihood Possible Evidence B

Phenobarbital (Luminal)

Theoretically, cocoa might reduce the effects of phenobarbital and increase the risk for convulsions.
Cocoa contains caffeine. Animal research suggests that caffeine can decrease the anticonvulsant activity of phenobarbital. The exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D

Phenylpropanolamine

Theoretically, phenylpropanolamine might increase the risk of hypertension, as well as the levels and adverse effects of caffeine.
Cocoa contains caffeine. Concomitant use of phenylpropanolamine and caffeine might cause an additive increase in blood pressure. Phenylpropanolamine also seems to increase caffeine serum levels.

Likelihood Probable Evidence B

Phenytoin (Dilantin)

Theoretically, cocoa might reduce the effects of phenytoin and increase the risk for convulsions.
Cocoa contains caffeine. Animal research suggests that caffeine can decrease the anticonvulsant activity of phenytoin. The effect does not seem to be related to the seizure threshold-lowering effects of caffeine. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D

Quinolone Antibiotics

Theoretically, quinolone antibiotics might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Quinolones (also referred to as fluoroquinolones) decrease caffeine clearance.

Likelihood Probable Evidence B

Riluzole (Rilutek)

Theoretically, concomitant use might increase the levels and adverse effects of both caffeine and riluzole.
Cocoa contains caffeine. Caffeine and riluzole are both metabolized by cytochrome P450 1A2, and concomitant use might reduce metabolism of one or both agents.

Likelihood Possible Evidence D

Stimulant Drugs

Theoretically, concomitant use might increase stimulant adverse effects.
Cocoa contains caffeine. Concomitant use might increase the risk of stimulant adverse effects.

Likelihood Probable Evidence C

Theophylline

Theoretically, cocoa might increase the levels and adverse effects of theophylline.
Cocoa contains caffeine. Large amounts of caffeine might inhibit theophylline metabolism. Caffeine decreases theophylline clearance 23% to 29%.

Likelihood Probable Evidence B

Valproate

Theoretically, cocoa might reduce the effects of valproate and increase the risk for convulsions.
Cocoa contains caffeine. Animal research suggests that caffeine can decrease the anticonvulsant activity of valproate. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D

Verapamil (Calan, Others)

Theoretically, verapamil might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Verapamil increases plasma caffeine concentrations by 25%.

Likelihood Possible Evidence D

Cimetidine (Tagamet)

Theoretically, concomitant use might increase the effects and adverse effects of caffeine in cocoa.
Cocoa contains caffeine. Cimetidine decreases caffeine clearance by 30% to 50%.

Likelihood Possible Evidence B

Contraceptive Drugs

Theoretically, concomitant use might increase the effects and adverse effects of caffeine found in cocoa.
Cocoa contains caffeine. Oral contraceptives decrease the rate of caffeine clearance by 40% to 65%.

Likelihood Possible Evidence B

Fluconazole (Diflucan)

Theoretically, fluconazole might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Fluconazole decreases caffeine clearance by approximately 25%.

Likelihood Possible Evidence B

Methoxsalen (Oxsoralen)

Theoretically, methoxsalen might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Methoxsalen can reduce caffeine metabolism.

Likelihood Possible Evidence B

Metmorphin (Glucophage)

Theoretically, metformin might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Animal research suggests that metformin can reduce caffeine metabolism.

Likelihood Possible Evidence D

Mexiletine (Mexitil)

Theoretically, mexiletine might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Mexiletine can decrease caffeine elimination by 50%. Concomitant use might increase the effects and adverse effects of caffeine in cocoa.

Likelihood Possible Evidence B

Phenothiazines

Theoretically, phenothiazines might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Phenothiazines can reduce the metabolism of caffeine by inhibiting cytochrome P450 1A2 (CYP1A2).

Likelihood Possible Evidence D

Terbinafine (Lamisil)

Theoretically, terbinafine might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. Terbinafine decreases the rate of caffeine clearance.

Likelihood Possible Evidence B

Tiagabine (Gabitril)

Theoretically, cocoa tea might increase the levels and adverse effects of tiagabine.
Cocoa contains caffeine. Animal research suggests that chronic caffeine administration can increase the serum concentrations of tiagabine. However, concomitant use does not seem to reduce the antiepileptic effects of tiagabine.

Likelihood Possible Evidence D

Ticlopidine (Ticlid)

Theoretically, ticlopidine might increase the levels and adverse effects of caffeine.
Cocoa contains caffeine. In vitro evidence suggests that ticlopidine can inhibit caffeine metabolism. However, this effect has not been reported in humans.

Likelihood Possible Evidence D

Monograph

Cocoa: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Cocoa is rich in plant compounds called flavanols that may modestly support blood vessel function and blood pressure, but most chocolate products are high in sugar, fat, and calories, which can offset any benefit. Enjoy cocoa as part of a balanced diet, and talk to your pharmacist before using concentrated cocoa supplements, especially if you have heart or blood pressure conditions.

Scientific name: Theobroma cacao
Family: Malvaceae
Part used: Seeds (cocoa beans), and the butter (fat) and powder made from them
Common forms: Cocoa powder, dark chocolate, cocoa extract capsules, flavanol-standardized supplements, cocoa butter (topical)

People commonly use it for

Heart and blood vessel health
High blood pressure
High cholesterol
Mental focus and mood
Skin moisturizing (cocoa butter)

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Cocoa in food amounts is generally safe, but it contains caffeine and related stimulants, and chocolate products are often high in sugar and calories.

PregnancyPossibly Safe

When used orally in moderate amounts. However, due to the caffeine content of cocoa preparations, intake should be closely monitored during pregnancy...

Read the full pregnancy detail

BreastfeedingPossibly Safe

When used in moderate amounts or in amounts commonly found in foods. Due to the caffeine content of cocoa preparations, intake should be closely monit...

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Cocoa comes from the seeds (beans) of the Theobroma cacao tree, which grows in warm, tropical parts of South America, Africa, and Asia. The beans are dried, roasted, and processed to make cocoa powder, cocoa butter, and chocolate.

People have used cocoa for hundreds of years, both as a food and as a folk remedy. Today it is enjoyed mostly as chocolate and cocoa drinks, but it is also sold as supplements made from cocoa extract or standardized cocoa flavanols. Cocoa butter is widely used in skin creams and lip balms.

Cocoa is naturally rich in plant compounds called flavanols and other antioxidants, which is why it has gained attention for possible heart-related benefits.

How it works

Cocoa contains flavanols (a type of flavonoid) and other polyphenols that act as antioxidants. In laboratory and some human studies, these compounds appear to help the lining of blood vessels make more nitric oxide, a substance that helps blood vessels widen and may support healthy blood flow.

Cocoa also contains caffeine and a related stimulant called theobromine, which can mildly affect alertness, heart rate, and urine output.

Much of the science behind cocoa's proposed benefits comes from laboratory, animal, and short-term human studies. These help explain how cocoa might work, but they do not prove it will improve health outcomes over the long term.

Effectiveness

Does Cocoa work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 32 uses evaluated

1 Possibly effective 2 Leans ineffective 29 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Possibly Effective Cardiovascular disease (CVD)