The following are the reported adverse effects of the drug: Gastrointestinal disorders: Nausea and vomiting, gastric discomfort.
Skin disorders: Skin rashes, pruritus, hair loss.
Central Nervous System disorder: Headache.
Blood and Lymphatic System disorders: Aplastic anemia or isolated thrombocytopenia and agranulocytosis (most serious).
Nervous System disorder: Taste disturbance.
Musculoskeletal and connective tissue disorders: Arthralgia, myopathy.
Cardiovascular disorder: Vasculitis.
Genito-urinary disorder: Nephritis.
Immune System disorder: Lupus-like syndrome.
Treatment with Methimazole should be discontinued or withdrawn if any of the following occurs: Blood disorder: Neutropenia.
Hepatic disorder: Liver damage (usually cholestatic jaundice).
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