RT Journal Article SR Electronic T1 Periodic paralysis caused by abuse of thyroid hormone JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 949 OP 949 DO 10.1212/WNL.24.10.949 VO 24 IS 10 A1 ROBERT B. LAYZER A1 EDYTHE GOLDFIELD YR 1974 UL http://n.neurology.org/content/24/10/949.abstract AB Periodic paralysis developed in three patients while they were taking thyroid pills to lose weight. Two of them were taking quite large amounts (1 0 to 30 gr of thyroid extract per day), but one, a man of Japanese ancestry, took the equivalent of only 2 to 4 gr of thyroid extract daily and had no signs of thyrotoxicosis. During a clinical trial he had no attacks of paralysis for 10 months while off thyroid medication, but twice became paralyzed after taking the equivalent of 4 gr of thyroid extract daily for four or five weeks. We suggest that such patients have the same defect that is responsible for periodic paralysis in endogenous thyrotoxicosis, a trait that is most common in Oriental males.