Herb & supplement monograph

Eicosapentaenoic Acid (epa) Drug Interactions, Uses, Effectiveness, Safety & More

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

What is this page for?

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

But these pages have grown well beyond that into a full monograph — what Eicosapentaenoic Acid (epa) 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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Eicosapentaenoic Acid (epa) Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, Eicosapentaenoic Acid (epa) drug interactions carry a moderate but manageable level of risk for most people, centered on blood pressure medicines and blood thinners. None of the listed interactions are rated major, and every one falls into just two moderate categories rather than many separate concerns.

Interactions deserving the most attention

The best-documented concern is with antihypertensive drugs, since fish oils containing EPA can lower blood pressure on their own and may add to the effect of these medicines, so blood pressure could drop more than expected. There is also a theoretical bleeding concern with anticoagulant and antiplatelet drugs, because human research shows EPA can make platelets less sticky. Anyone on a blood thinner or closely managed blood pressure treatment should watch for signs like unusual bruising or lightheadedness.

What the rest of the list means

Although hundreds of medications appear on the interaction list, they all trace back to these two shared effects, not to hundreds of separate problems. Much of the bleeding concern remains theoretical and has not been shown to cause meaningful harm in most people, while the blood pressure effect is simply additive rather than dangerous on its own.

Check your medications against Eicosapentaenoic Acid (epa)

Based on HelloPharmacist’s Eicosapentaenoic Acid (epa) interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Eicosapentaenoic Acid (epa)

289 medications have a known interaction with Eicosapentaenoic Acid (epa), 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 Eicosapentaenoic Acid (epa) using our pharmacist-reviewed interaction data.

AI summaries are generated from our Eicosapentaenoic Acid (epa) 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 Eicosapentaenoic Acid (epa) 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 Eicosapentaenoic Acid (epa) affects

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

All 2 drug categories Eicosapentaenoic Acid (epa) interacts with

Anticoagulant/antiplatelet DrugsAntihypertensive Drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, EPA may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
In human research, taking EPA has been shown to inhibit platelet aggregation.

Likelihood Possible Evidence B

Antihypertensive Drugs

Theoretically, taking EPA with antihypertensive drugs might increase the risk of hypotension.
Fish oils containing EPA can lower blood pressure and might have additive effects in patients treated with antihypertensives; use with caution.

Likelihood Probable Evidence B

Monograph

Eicosapentaenoic Acid (epa): Uses, Safety & Side Effects

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

The bottom line

EPA is an omega-3 fatty acid found mostly in fatty fish and fish oil, and it is best known for lowering high triglycerides. It may also help with inflammation and mood in some people, but evidence varies by condition. Talk with your pharmacist or doctor before starting, especially if you take blood thinners or have a fish allergy.

Part used: Omega-3 fatty acid derived mainly from fatty fish and fish oil; also from algae
Common forms: Softgel capsules, liquid fish oil, prescription-strength capsules, algae-based supplements

People commonly use it for

Heart and triglyceride health
Inflammation
Mood and depression support
Joint comfort
General omega-3 supplementation

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

Safety at a glance

OverallLikely safe

EPA is generally well tolerated for most adults at typical supplement doses.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

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

Eicosapentaenoic acid (EPA) is a type of omega-3 fatty acid. The body cannot make enough of it on its own, so we get it mainly from foods like salmon, sardines, mackerel, and anchovies. It is also made by certain types of marine algae, which is the original source that fish get it from.

EPA is one of the two main long-chain omega-3 fats in fish oil. The other is DHA (docosahexaenoic acid). Many supplements contain both EPA and DHA, but some products are made to contain mostly EPA.

People take EPA supplements for heart health, high triglycerides, inflammation, and mood. It comes in fish oil capsules, liquid oils, prescription products, and algae-based options for people who prefer to avoid fish.

How it works

EPA is a building block your body uses to make signaling molecules that help control inflammation. Unlike some other fats that can promote inflammation, EPA helps make compounds that tend to calm it down.

EPA can also lower the amount of triglycerides your liver makes and releases into the blood. It may have mild effects on blood clotting and blood vessel function as well.

Many of these effects come from laboratory and clinical research, but scientists are still learning exactly how EPA produces its benefits in different conditions.

Effectiveness

Does Eicosapentaenoic Acid (epa) work?

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

Evidence overview · 46 uses evaluated

1 Effective 3 Possibly effective 42 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.

Effective Hypertriglyceridemia