Can I take Carbimazole and Omeprazole together?

Why this happens

Carbimazole (used for overactive thyroid) and omeprazole (used for acid reflux) are processed by different pathways in the body. They do not interfere with each other's absorption, metabolism, or effectiveness.

What you should do

You can continue taking both medications as prescribed by your doctor. You do not need to change the timing of your doses or take any special precautions. Always inform your doctor or pharmacist if you start any new supplements or over-the-counter medicines.

Important precautions

Infection (Agranulocytosis)

Stop taking carbimazole and see a doctor immediately if you develop a sore throat, mouth ulcers, high temperature, or unexplained bruising. This can be a sign of a serious bone marrow disorder where your white blood cell count drops dangerously low.

Acute Pancreatitis

Stop treatment immediately and seek urgent medical help if you develop severe, persistent abdominal pain. You must never take carbimazole again if you have previously suffered from pancreatitis caused by this medication.

Pregnancy

Carbimazole can cause serious harm to an unborn baby. Effective contraception must be used during treatment. If you become pregnant or plan to have a baby, you must notify your doctor immediately to discuss switching to a safer alternative.

Severe diarrhoea

Contact your doctor if you develop severe or persistent watery diarrhoea, as omeprazole can increase the risk of a serious bowel infection called C. difficile.

Lupus-like skin reactions - omeprazole

Seek medical advice if you develop a skin rash, especially in areas exposed to the sun, as this may be a sign of subacute cutaneous lupus erythematosus (SCLE).

Food and drink warnings

Alcohol

While alcohol does not directly interact with omeprazole, it can increase stomach acid production and irritate the stomach lining, which may worsen the symptoms you are taking omeprazole to treat. It is best to limit alcohol intake.

While there is no direct interaction between carbimazole and alcohol, carbimazole can rarely cause liver problems. Excessive alcohol consumption can also strain the liver, so it is advisable to drink in moderation while taking this medication.

Caffeine

Caffeine (found in coffee, tea, and energy drinks) can increase stomach acid and may reduce the effectiveness of omeprazole in managing symptoms like acid reflux or heartburn.

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.