TY - JOUR T1 - Thyroxine-induced periodic paralysis: a rare complication of nutritional supplements JF - BMJ Case Reports JO - BMJ Case Reports DO - 10.1136/bcr-2018-227946 VL - 11 IS - 1 SP - e227946 AU - Muhammad Arslan Cheema AU - Muhammad Abdullah Zain AU - Khadija Cheema AU - Waqas Ullah Y1 - 2018/11/01 UR - http://casereports.bmj.com/content/11/1/e227946.abstract N2 - The consumption of daily nutritional supplements has risen dramatically all over the world. Many people believe that dietary supplements, if not useful, are at least safe to fulfil small dietary gaps. Many nutritional supplements have not been approved by Federal Drug Administration due to their unregulated active ingredients, but they are available as over the counter. One of the active ingredients, exogenous triiodothyronine (T3), has been reported in dietary supplements. We present a case of sudden onset of tetraparesis. Laboratory workup showed hypokalaemia, low thyroid-stimulating hormone and thyroxine (T4) but normal T3 and thyroglobulin levels. The radioiodine uptake scan also showed reduced uptake. After aggressive serum potassium correction and stopping supplements, his condition got improved. So the suspicion of exogenous T3-induced thyrotoxic periodic paralysis was confirmed. ER -