PrazosinAlpha Receptor Blocker (Cardiovascular Preparations) Indication: Hypertension (Primary and Secondary Hypertension). Dosage & Administration: Prazosin Extended Release (ER) Tablet administration in Hypertension: Prazosin extended release tablet therapy must be initiated at 2.5 mg once daily. The 5 mg dosage form is not for initial dosing. Dosage should be increased slowly, in general over a 7 […]