Headache, dizziness, diarrhea, nausea, vomiting. Valsartan: Vertigo, fatigue, abdominal pain, muscle cramps, dry cough, hypotension, pruritus, rash, impotence. Hydrochlorothiazide: Electrolyte imbalance; anorexia, gastric irritation, sialadenitis, photosensitivity reactions, orthostatic hypotension, paraesthesia & yellow vision.