Prazosin is in a group of drugs called alpha-adrenergic (AL-fa ad-ren-ER-jik) blockers. Prazosin relaxes your veins and arteries so that blood can more easily pass through them.

Prazosin is used to treat hypertension (high blood pressure).

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  • Minipress
  • More common
    Dizziness or lightheadedness, especially when getting up from a lying or sitting position
    fainting (sudden)
    Less common
    Loss of bladder control
    pounding heartbeat
    swelling of the feet or lower legs
    Rare
    Chest pain
    trouble breathing
    Incidence not known
    Painful or prolonged erection of the penis
  • (prazosin hydrochloride) capsule