Levothyroxine
Thyroxine T4
Liothyronine
Tri-iodothyronine or T3
Carbimazole
Block thyroid hormone synthesis; propylthiouracil also inhibits peripheral conversion of T4 to T3.
Propylthiouracil
Block thyroid hormone synthesis; propylthiouracil also inhibits peripheral conversion of T4 to T3.
Iodine
Transiently inhibits thyroid hormone release; reduces thyroid vascularity in Graves’ disease.