Methylthiouracil
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![Methylthiouracil synthesis:[1]](/Images/godic/202501/27/Methylthiouracil_synthesis.svg2926.png")
Methylthiouracil is an 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.
The drug acts to decrease the formation of stored thyroid hormone, as thyroglobulin in the thyroid gland.