Losartan K: Dizziness, dose-related orthostatic hypotension; hyperkalemia in renal disease; resp tract disorder, back pain, GI disturbances, fatigue, neutropenia. Hydrochlorothiazide: Hyperglycemia & glycosuria; hyperuricemia & gout attacks; electrolyte imbalances eg, hypochloremic alkalosis, hyponatremia, hypokalemia.