Comparative Pharmacology
Head-to-head clinical analysis: METHIMAZOLE versus TAPAZOLE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: METHIMAZOLE versus TAPAZOLE.
METHIMAZOLE vs TAPAZOLE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Inhibits thyroid peroxidase, thereby blocking the synthesis of thyroid hormones (T3 and T4). Also inhibits peripheral conversion of T4 to T3.
Inhibits thyroid peroxidase, thereby blocking the synthesis of thyroid hormones (T3 and T4) and reducing iodine organification and coupling of iodotyrosines.
Oral, initial dose 15-40 mg daily in 3 divided doses; maintenance dose 5-15 mg daily
15-40 mg per day orally in 3 divided doses; maintenance: 5-15 mg per day orally once daily.
None Documented
None Documented
4-6 hours in euthyroid patients; prolonged to 10-15 hours in hyperthyroid patients. Clinical context: steady-state achieved in 2-3 days, but therapeutic effect on thyroid hormone synthesis requires 3-8 weeks due to depletion of stored hormones.
Clinical Note
moderateMethimazole + Prednisolone
"The serum concentration of Prednisolone can be decreased when it is combined with Methimazole."
Clinical Note
moderateMethimazole + Artesunate
"The serum concentration of the active metabolites of Artesunate can be reduced when Artesunate is used in combination with Methimazole resulting in a loss in efficacy."
Clinical Note
moderateMethimazole + Fesoterodine
"The serum concentration of the active metabolites of Fesoterodine can be increased when Fesoterodine is used in combination with Methimazole."
Clinical Note
moderate3-6 hours; clinically, effects persist longer due to intrathyroidal accumulation.
Primarily renal (65-70% as unchanged drug and metabolites), with minor biliary/fecal elimination (<10%).
Primarily renal, approximately 65% excreted in urine as metabolites and unchanged drug; <10% eliminated in feces via biliary excretion.
Category D/X
Category C
Antithyroid Agent
Antithyroid Agent
Methimazole + Clozapine
"The risk or severity of adverse effects can be increased when Methimazole is combined with Clozapine."