One of the few cases of thyrotoxic periodic paralysis in our country i
s reported. A twenty-one year old male patient with Graves disease for
more than three years had a Door compliance with the therapeutical re
gimen, with mainly nightly episodes of self-limited limb weakness asso
ciated with hypokalemia. The patient has no familiar antecedents of pe
riodic paralysis and the clinical manifestations resolved with treatme
nt of hyperthyroidism.