VERAPAMIL-INDUCED PRIMARY POLYDIPSIA

An 11-month-old male infant with recurrent supraventricular tachycardi a (SVT) was treated with oral verapamil. Shortly thereafter he develop ed marked changes in behavior including lethargy, intensely increased thirst and urination, and irritability when denied fluids, ''Primary'' polydipsia was diagnosed following an evaluation which showed no evid ence of adrenal insufficiency, diabetes insipidus, diabetes mellitus, hypercalcemia, hyperosmolality, or renal disease, The symptoms resolve d 1 week after verapamil was discontinued.