[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Pharmacology](https://durgical.com/en/pharmacology/) › [Prescription omega-3 fatty acids](https://durgical.com/en/pharmacology/classes/prescription-omega-3-fatty-acids/) › Icosapent ethyl

# Icosapent ethyl

## Prescription omega-3 fatty acids?

Prescription omega-3 fatty acids

A purified EPA (fish-oil) ethyl ester that lowers triglycerides and, with a statin, reduces heart attack and stroke in high-risk adults.

Updated Nov 1, 2026

Also called: ethyl eicosapentaenoate, EPA ethyl ester

## Quick facts

**Group**
[Prescription omega-3 fatty acids](https://durgical.com/en/pharmacology/classes/prescription-omega-3-fatty-acids/)

**Target**
Hepatic triglyceride and VLDL synthesis (no single protein target)

**Used for**
Severe hypertriglyceridaemia · To reduce heart attack

**Key effects**
Muscle or joint pain · Constipation

**Monitor**
Triglycerides and lipid profile · Signs of bleeding

No doses: the clinician sets them by the current guideline.

On this page

- The basics Mechanism of action
- Indications
- Adverse effects
- Pharmacokinetics
- Memory aid

- Safety Contraindications
- Key interactions
- What is monitored
- Administration and safety
- Pregnancy and breastfeeding
- Nursing care

- Study Test yourself

- Connections Connections

## Mechanism of action

Icosapent ethyl is the ethyl ester of eicosapentaenoic acid (EPA), an omega-3 fatty acid; it contains no DHA. It lowers the liver's synthesis and secretion of triglyceride-rich VLDL and increases triglyceride clearance. Its effect on cardiovascular events seems larger than the triglyceride fall alone would predict; membrane, anti-inflammatory and antiplatelet effects are proposed.

- Absorbed and incorporated as EPA into cell membranes and lipids
- Liver makes and releases less VLDL
- Triglycerides fall without a rise in LDL
- Fewer cardiovascular events added to a statin

## Indications

- Severe hypertriglyceridaemia, as an adjunct to diet
- To reduce heart attack, stroke and related hospitalizations in adults on a statin with raised triglycerides and heart disease or diabetes with other risk factors [Atherosclerosis and dyslipidaemia →](https://durgical.com/en/conditions/atherosclerosis-and-dyslipidaemia/)

## Adverse effects

### Common

- Muscle or joint pain
- Constipation
- Swelling of legs or ankles

### Serious (rare, important)

- Atrial fibrillation or flutter needing hospital care
- Bleeding, more with anticoagulants or antiplatelets
- Allergic reactions

## Contraindications

- Hypersensitivity to icosapent ethyl or the capsule ingredients

## Key interactions

**Anticoagulants and antiplatelet drugs**
Bleeding risk adds up; patients are watched for bleeding.

## What is monitored

- Triglycerides and lipid profile
- Heart rhythm symptoms (palpitations, irregular pulse)
- Signs of bleeding
- Liver tests in liver disease

## Administration and safety

- Oral capsules, twice a day with food.
- Swallowed whole: not broken, chewed, crushed or dissolved.
- Not interchangeable with over-the-counter fish oil supplements.

## Pregnancy and breastfeeding

Data in pregnancy are limited; it is used only if the benefit is judged to outweigh the risk.

## Nursing care

- Before: fish or shellfish allergy, anticoagulant or antiplatelet use, history of atrial fibrillation.
- During: ask about palpitations, dizziness, breathlessness and bleeding.
- Teach that diet and exercise remain part of treatment.
- Teach that store-bought fish oil is not a substitute.

## Pharmacokinetics

**Absorption**
Oral, taken with food; the ester is converted to EPA during absorption.

**Metabolism**
EPA is broken down in the liver by beta-oxidation, like dietary fatty acids.

**Half-life**
Long: several days for EPA (label).

## Memory aid

ICOSApent = EPA 'pure fish oil' (no DHA): lowers triglycerides without raising LDL. Two warnings ride along: a fluttering atrium and easy bleeding.

## Test yourself

Think of the answer, then tap the question to see it.

## What does icosapent ethyl contain, and how does it differ from mixed omega-3 products?

Only EPA ethyl ester, without DHA; mixtures with DHA can raise LDL, EPA alone seems not to.

## Which heart rhythm problem is a warning with icosapent ethyl?

Atrial fibrillation or flutter.

## Why is a patient on warfarin and icosapent ethyl watched closely?

Icosapent ethyl increases bleeding risk, which adds to the anticoagulant.

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[More Pharmacology questions →](https://durgical.com/en/practice/?f=pharmacology)

## Connections

## Related drugs 2

- [Fenofibrate](https://durgical.com/en/pharmacology/fenofibrate/)
- [Atorvastatin](https://durgical.com/en/pharmacology/atorvastatin/)

## Related conditions 1

- [Atherosclerosis and dyslipidaemia](https://durgical.com/en/conditions/atherosclerosis-and-dyslipidaemia/)

[← Back to the class: Prescription omega-3 fatty acids](https://durgical.com/en/pharmacology/classes/prescription-omega-3-fatty-acids/)

Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.

Sources: [Icosapent Ethyl: MedlinePlus Drug Information](https://medlineplus.gov/druginfo/meds/a613024.html) (MedlinePlus (U.S. National Library of Medicine), 2026); [DailyMed - ICOSAPENT ETHYL capsule](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=886aa8d8-b293-258f-b16d-be40418787a8) (DailyMed (U.S. National Library of Medicine), 2026).

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Representative model, for educational purposes only.

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Source: https://durgical.com/en/pharmacology/icosapent-ethyl/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/pharmacology/icosapent-ethyl/