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:: Overview :: Precautions :: Side Effects :: Further Reading Search results last updated: 5/9/2009

Generic & Brand Name : Source: (RXList)

Brand Name : Tapazole
Generic Name : Methimazole

Overview (Source: MedicineNet)
Methimazole is used to treat an overactive thyroid gland ( hyperthyroidism ). Grave's disease is the most common cause of hyperthyroidism. It is an autoimmune disease resulting from antibodies that attach to receptors on thyroid hormone-producing cells in the thyroid gland and trigger overproduction of thyroid hormone . An enzyme (peroxidase) produces thyroid hormones, i.e., thyroxine (T4) and triiodothyronine (T3), by combining iodine with a protein called thyroglobulin . Methimazole prevents iodine and peroxidase from their normal interactions with thyroglobulin to form T4 and T3. This action decreases thyroid hormone production. Methimazole also interferes with the conversion of T4 to T3. Since T3 is more potent than T4, this also reduces the activity of thyroid hormones. The FDA approved methimazole in March 1999. ...
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Precautions (Source: RXList)
Agranulocytosis is potentially a serious side effect. Patients should be instructed to report to their physicians any symptoms of agranulocytosis, such as fever or sore throat . Leukopenia , thrombocytopenia, and aplastic anemia ( pancytopenia ) may also occur. The drug should be discontinued in the presence of agranulocytosis, aplastic anemia (pancytopenia), hepatitis , or exfoliative dermatitis . The patient's bone marrow function should be monitored. Due to the similar hepatic toxicity profiles of Tapazole and propylthiouracil , attention is drawn to the severe hepatic reactions which have occurred with both drugs. There have been rare reports of fulminant hepatitis, hepatic necrosis , encephalopathy, and death. Symptoms suggestive of hepatic dysfunction ( anorexia , pruritis, right upper quadrant pain , etc) should prompt evaluation of liver function. Drug treatment should be discontinued promptly in the event of clinically significant evidence of liver abnormality including hepatic transaminase values exceeding 3 times the upper limit of normal. Tapazole can cause fetal harm when administered to a pregnant woman. Tapazole readily crosses the placental membranes and can induce goiter and even cretinism in the developing fetus . In addition, rare instances of congenital defects: aplasia cutis , as manifested by scalp defects; esophageal atresia with tracheoesophageal fistula ; and choanal atresia with absent/hypoplastic nipples, have occurred in infants born to mothers who ...
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Side Effects (Source: RXList)
Major adverse reactions (which occur with much less frequency than the minor adverse reactions) include inhibition of myelopoieses ( agranulocytosis , granulocy-topenia, and thrombocytopenia), aplastic anemia , drug fever , a lupuslike syndrome , insulin autoimmune syndrome (which can result in hypoglycemic coma ), hepatitis ( jaundice may persist for several weeks after discontinuation of the drug), periar-teritis, and hypoprothrombinemia. Nephritis occurs very rarely. Minor adverse reactions include skin rash , urticaria , nausea , vomiting, epigastric distress, arthralgia , paresthesia , loss of taste , abnormal loss of hair, myalgia , headache , pruritus , drowsiness, neuritis , edema , vertigo , skin pigmentation , jaundice, sialadenopathy, and lymphadenopathy . It should be noted that about 10% of patients with untreated hyperthyroidism have leukopenia (white-blood-cell count of less than 4,000/mm 3 ), often with relative granulopenia. ...
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Further Reading on tapazole
  • Thyroid-Stimulating Hormone (TSH) ( WebMD )
    A thyroid - stimulating hormone ( TSH ) blood test is used to detect problems affecting the thyroid ...heparin, dopamine, lithium (such as Carbolith or Duralith), methimazole ( Tapazole ), and...

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