[Effects of chronic administration of lithium on thyroxine (T4), triiodothyronine (T3), reverse T3 (rT3) free thyroxine ratio (FTR) and thyreostimuline (TSH) in thyrotoxicosis (author's transl)].

Fourteen hyperthyroid subjects were studied between 3 and 141 days. The reduction of thyrotoxicosis is rarely obtained (2 cases), mainly because on the one hand, correct plasma lithium level (0.7-1.2 mEq/L) is rarely obtained (3 cases only), on the other hand because a high dose of lithium is required, perhaps owing to high clearance of lithium in thyrotoxicosis. The indications of lithium use in thyrotoxicosis are reviewed.