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The antihypertensive effect of oral propranolol was studied in 9 children with hypertension. After treatment with propranolol, systolic blood pressure fell by an average of 26 mmHg (P less than 0.01). Diastolic pressure decreased by 20 mmHg on average (P less than 0.01). The mean propranolol dose was 2.5 mg/kg per day. Side effects included bradycardia and anorexia. There was no correlation between pretreatment plasma renin activity and fall in blood pressure. Propranolol is an effective and well tolerated antihypertensive agent in children.