What is this medication?
Antithyroid Agent; Thioamide
Methimazole, Tapazole is indicated for management of hyperthyroidism.
How does this medication work?
Methimazole, Tapazole inhibits the synthesis of thyroid hormones and thus is effective in the treatment of hyperthyroidism. Methimazole, Tapazole does not inactivate stored and circulating thyroxine and triiodothyronine nor does it interfere with the effectiveness of thyroid hormones given by mouth or injection.
How should I take this medication?
Usual (Oral): Initial dosing is based on clinical status and gland size; free T4 levels may be used to guide initial therapy.
Free T4 levels 1 to 1.5 times ULN: 5 to 10 mg once daily.
Free T4 levels >1.5 to 2 times ULN (or iodine-induced thyrotoxicosis): 10 to 20 mg once daily.
Free T4 levels >2 times ULN: 20 to 40 mg/day.
Dose adjustment: Usual maintenance dose: 5 to 10 mg once daily. Assess free T4 and total T3 at 4- to 6-week intervals; when normal, reduce dose by 30% to 50% and repeat thyroid function tests in 4 to 6 weeks; continue to adjust dose to achieve euthyroidism.
How to Take: Take with or without food
What should I watch for while using this medication?
Before using Methimazole, Tapazole, make sure your physician is aware of any allergies, medications you currently take, pre-existing medical conditions and activities you perform. Methimazole, Tapazole use has been associated with rare but serious adverse events such as bone marrow suppression, bleeding, dermatologic effects, fever, hepatic effects, hypothyroidism, lupus-like syndrome, and vasculitis.
What if I miss a dose?
If you miss a dose of medication, try to take it as soon as possible. However, if it is almost time for your next dose, take only that scheduled dose. Do not take double or extra doses.
How should I store this medication?
Keep out of the reach of children at all times. Store at room temperature, 59 to 86° F (15 to 30° C). Protect from light. Keep the container tightly closed. Properly dispose of any unused medication after the expiration date.
What are the possible side effects of using this medication?
The frequency and incidence of side effects is not well defined but do include:
Edema, periarteritis, drowsiness, drug fever, headache, neuritis, paresthesia, vertigo, alopecia, pruritus, skin pigmentation, skin rash, urticaria, hypoglycemic coma, hypothyroidism, insulin autoimmune syndrome, ageusia, enlargement of salivary glands, epigastric distress, nausea, vomiting, agranulocytosis, aplastic anemia, granulocytopenia, hypoprothrombinemia, leukopenia, lymphadenopathy, thrombocytopenia, hepatitis, jaundice, arthralgia, lupus-like syndrome, myalgia, nephritis
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