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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 .
Thiamazole is a drug used to treat hyperthyroidism such as in Graves' disease, a condition that occurs when the thyroid gland begins to produce an excess of thyroid hormone. The drug may also be taken before thyroid surgery to lower thyroid hormone levels and minimize the effects of thyroid manipulation.
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.
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 ).
Drugs used to help manage the symptoms of hyperthyroidism are methimazole and carbimazole. Drug therapy is the least expensive option, even though the drug must be administered daily for the remainder of the cat's life. Carbimazole is only available as a once daily tablet.
Treatment of Graves disease includes antithyroid drugs that reduce the production of thyroid hormone, radioiodine (radioactive iodine I-131) and thyroidectomy (surgical excision of the gland). As operating on a hyperthyroid patient is dangerous, prior to thyroidectomy, preoperative treatment with antithyroid drugs is given to render the patient ...
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 ...
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.