Brief-time period administration of large doses of glucocorticoids may minimize serum T3 concentrations by 30% with minimum adjust in serum T4 levels. Even so, extensive-time period glucocorticoid therapy may lead to a bit lessened T3 and T4 concentrations as a result of reduced TBG creation (see above). Phenytoin and carbamazepine http://www.t3tiromel.com