Doxazosin is an alpha-adrenergic (AL-fa ad-ren-ER-jik) blockers. Doxazosin relaxes your veins and arteries so that blood can more easily pass through them. It also relaxes the muscles in the prostate and bladder neck, making it easier to urinate.

Doxazosin is used to treat hypertension (high blood pressure), or to improve urination in men with benign prostatic hyperplasia (enlarged prostate).

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  • Cardura, Cardura XL
  • Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

    Call your doctor at once if you have:

    a light-headed feeling, like you might pass out;
    severe ongoing stomach pain or bloating;
    new or worsening chest pain;
    trouble breathing; or
    a penis erection that is painful or lasts 4 hours or longer.
    Common side effects may include:

    low blood pressure, dizziness;
    drowsiness;
    headache; or
    feeling tired.
  • The initial dose of CARDURA XL, 4 mg given once daily, should be administered with breakfast. Depending on the patient's symptomatic response and tolerability, the dose may be increased to 8 mg, the maximum recommended dose. The recommended titration interval is 3–4 weeks. If CARDURA XL administration is discontinued for several days, therapy should be restarted using the 4 mg once daily dose. Tablets should be swallowed whole, and must not be chewed, divided, cut, or crushed.