MSFinals-1011

A 36-year-old man visits his doctor’s office accompanied by his wife, who expresses concern that her husband has been acting strangely and not like himself lately. Upon questioning, the patient appears confused and complains of a persistent headache. The doctor conducts an examination but finds no additional signs. To investigate further, the doctor orders a full blood count with electrolytes and renal function, as well as a urinary analysis. The results reveal hyponatremia with reduced plasma osmolality and high urinary osmolality and sodium. Which medication is most commonly associated with the syndrome of inappropriate antidiuretic hormone secretion (SIADH)?