Losartan: Dizziness, dose-related orthostatic hypotension; impaired renal function; hypokalaemia, myalgia; resp tract disorders, back pain, GI disturbances, fatigue, neutropenia. Hydrochlorothiazide: Metabolic disturbances especially at high doses; hyperglycemia, glycosuria in diabetic & other susceptible patients; hyperuricemia & may precipitate gout attacks.