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In Graves' disease, treatment with antithyroid medications must be given for six months to two years, in order to be effective. Even then, upon cessation of the drugs, the hyperthyroid state may recur. Side effects of the antithyroid medications include a potentially fatal reduction in the level of white blood cells.
Thiamazole, also known as methimazole, is a medication used to treat hyperthyroidism. [2] This includes Graves disease, toxic multinodular goiter, and thyrotoxic crisis. [2] It is taken by mouth. [2] Full effects may take a few weeks to occur. [3] Common side effects include itchiness, hair loss, nausea, muscle pain, swelling, and abdominal ...
Common side effects include itchiness, hair loss, parotid swelling, vomiting, muscle pains, numbness, and headache. [3] Other severe side effects include liver problems and low blood cell counts. [3] Use during pregnancy may harm the baby. [3] Propylthiouracil is in the antithyroid family of medications. [4]
Carbimazole is a pro-drug as after absorption it is converted to the active form, methimazole. Methimazole prevents thyroid peroxidase enzyme from iodinating and coupling the tyrosine residues on thyroglobulin, hence reducing the production of the thyroid hormones T 3 and T 4 . It is on the World Health Organization's List of Essential Medicines.
Treatment with antithyroid medications must be administered for six months to two years to be effective. Even then, upon cessation of the drugs, the hyperthyroid state may recur. The risk of recurrence is about 40–50%, and lifelong treatment with antithyroid drugs carries some side effects such as agranulocytosis and liver disease. [27]
Thioamides or anti-thyroid drugs are also a class of drugs that are used to control thyrotoxicosis. Thioamides have been incorporated into peptides as isosteres for the amide bond. [ 10 ] Peptide modifications are analogues of the native peptide, which can reveal the structure-activity relationship ( SAR ).
Methylthiouracil is an organosulfur compound that is used antithyroid preparation. It is a thioamide , closely related to propylthiouracil . Methylthiouracil is not used clinically in the United States, it has a similar mechanism of action and side effect to that of propylthiouricil.
Certain medications can have the unintended side effect of affecting thyroid function. While some medications can lead to significant hypothyroidism or hyperthyroidism and those at risk will need to be carefully monitored, some medications may affect thyroid hormone lab tests without causing any symptoms or clinical changes, and may not require treatment.
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