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Can I take Atorvastatin and Cod liver oil together?

Drug interaction guide

There is no known harmful interaction between atorvastatin and cod liver oil. In fact, they are often used together to help manage heart health and cholesterol levels. However, both substances can have a very mild thinning effect on the blood.

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Why this happens

Atorvastatin works by reducing the amount of cholesterol made by the liver. Cod liver oil contains omega-3 fatty acids, which help lower triglycerides (another type of blood fat). While both can slightly influence how blood cells stick together, this effect is generally not strong enough to cause clinical problems for most people.

It is generally safe to take these together. If you are also taking prescribed blood-thinning medication (like warfarin or aspirin), or if you have a planned surgery, you should inform your doctor or pharmacist before starting cod liver oil. Always stick to the recommended dose on the supplement packaging.

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Pregnancy

You must not take atorvastatin if you are pregnant or planning to become pregnant, as it can cause serious harm to an unborn baby. Use effective contraception while taking this medicine.

Muscle disorders - atorvastatin

Seek immediate medical advice if you experience unexplained muscle pain, tenderness, or weakness. In rare cases, this can lead to a serious condition called rhabdomyolysis which causes kidney damage.

Blood-thinning medication (e.g., warfarin)

Cod liver oil can increase the risk of bleeding if taken with blood-thinning medicines. Consult your pharmacist or doctor before combining them.

Grapefruit juice

Grapefruit juice can increase the level of atorvastatin in your blood, which may increase the risk of side effects like muscle pain or damage. Avoid drinking large amounts (more than 1.2 litres daily), though a small glass is usually safe.

Alcohol

Drinking large amounts of alcohol while taking atorvastatin can increase the risk of liver problems. It is best to keep your alcohol intake within the recommended limits. It may also increase the risk of muscle side effects.

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Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.

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Article history

The information on this page is written and peer reviewed by qualified clinicians.

  • 25 Jan 2026 | Originally published
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