Before beginning treatment, it's important to be aware of safety issues with methimazole. For example, the antithyroid medicine can cause severe liver damage, low white blood cell counts, and low blood platelets. In addition, alcohol should be avoided while taking it. Other warnings and precautions for methimazole apply to women who are pregnant or breastfeeding.
You should avoid alcohol while taking this medicine, as additive effects, such as increased drowsiness, confusion, or memory loss, could occur.
Methimazole can potentially interact with other medications (see Drug Interactions With Methimazole).
Methimazole is a pregnancy Category D medication, which means it presents clear risks during pregnancy. Check with your healthcare provider before taking this drug when pregnant (see Methimazole and Pregnancy).