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An antithyroid agent is a hormone inhibitor acting upon thyroid hormones. The main antithyroid drugs are carbimazole (in the UK), methimazole (in the US), and propylthiouracil (PTU). A less common antithyroid agent is potassium perchlorate .
The primary treatment of thyroid storm is with inorganic iodine and antithyroid drugs (propylthiouracil or methimazole) to reduce synthesis and release of thyroid hormone. Temperature control and intravenous fluids are also mainstays of management.
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.
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.
Propylthiouracil is in the antithyroid family of medications. [4] It works by decreasing the amount of thyroid hormone produced by the thyroid gland and blocking the conversion of thyroxine (T4) to triiodothyronine (T3). [3] Propylthiouracil came into medical use in the 1940s. [5] It is on the World Health Organization's List of Essential ...
Antithyroid autoantibodies (or simply antithyroid antibodies) are autoantibodies targeted against one or more components on the thyroid. The most clinically relevant anti-thyroid autoantibodies are anti- thyroid peroxidase antibodies (anti-TPO antibodies, TPOAb), thyrotropin receptor antibodies (TRAb) and thyroglobulin antibodies (TgAb).
Amiodarone inhibits peripheral conversion of thyroxine to triiodothyronine; also interferes with thyroid hormone action. [citation needed] Lithium inhibits thyroid hormone release. [citation needed] Phenobarbitone, phenytoin, carbamazepine, rifampin induce metabolic degradation of triiodothyronine (T 3) and thyroxine (T 4). [citation needed]
The substance is a historically relevant anti-thyroid preparation. Edwin Astwood used it in 1943 as therapy for Graves' disease for the first time. [1] [2] [3] Thiouracil inhibits thyroid activity by blocking the enzyme thyroid peroxidase. [4] Its use in recent times has been replaced by advent of more potent and safer antithyroid drugs.
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