Taking carbimazole with other medicines and herbal supplements

Taking carbimazole can affect the way certain medicines work, while some medicines are affected by your thyroid hormone levels. These levels will change as carbimazole starts to work.

For this reason, your doctor will want to review the medicines you take and possibly change the dosage.

Tell your doctor before starting treatment with carbimazole if you take any other medicines, including:

• digoxin, a heart medicine
• erythromycin, an antibiotic
• theophylline, used to treat breathing problems
• bladder medicines for urinary incontinence and other bladder problems
• blood pressure medicines called beta blockers – these are often prescribed together with carbimazole and your doctor will tell you how much to take
• medicines that help prevent blood clots (anticoagulants) such as warfarin
• steroids such as prednisolone
• clozapine, an antipsychotic

These are not all the medicines that may cause problems if you take them with carbimazole. For a full list, see the leaflet inside your medicine packet.