Can I take Anastrozole and Simvastatin together?

Why this happens

Anastrozole is an aromatase inhibitor used for breast cancer, and simvastatin is a statin used for cholesterol. They are processed by different pathways in the liver and do not interfere with how the body absorbs or removes the other. While they do not interact directly, they share a similar side-effect profile regarding muscle and joint discomfort.

What you should do

You can safely take these two medicines together. If you experience any new or worsening muscle pain, tenderness, or weakness, you should contact your doctor. It is helpful to keep a record of when any symptoms started so your doctor can determine which medication might be responsible.

Important precautions

Pregnancy

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

Muscle pain or weakness

You must report any unexplained muscle pain, tenderness, or weakness to your doctor immediately. In rare cases, this can lead to serious kidney damage.

Osteoporosis (Bone thinning)

Anastrozole significantly lowers oestrogen levels, which can weaken your bones and increase the risk of fractures. Your doctor should monitor your bone density.

Food and drink warnings

Grapefruit juice

Grapefruit juice contains compounds that inhibit the enzyme (CYP3A4) responsible for breaking down simvastatin. This can significantly increase the levels of the medicine in your blood, raising the risk of serious side effects like muscle damage (rhabdomyolysis). You should avoid drinking grapefruit juice or eating grapefruit while taking this medicine.

Alcohol

While moderate alcohol consumption is generally acceptable, heavy drinking or binge drinking while taking simvastatin increases the risk of liver problems. Since both alcohol and statins affect the liver, it is best to keep your intake within the recommended low-risk limits.

Using other medicines

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.