Doxazosin is an alpha-adrenergic (AL-fa ad-ren-ER-jik) blockers. It 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, Doxadura, Cascor, Carduran
  • More common
    Dizziness or lightheadedness
    Less common
    Blurred vision
    confusion
    dizziness, faintness, or lightheadedness when getting up from a lying or sitting position
    fainting (sudden)
    fast and pounding heartbeat
    irregular heartbeat
    shortness of breath
    sweating
    swelling of feet or lower legs
    Rare
    Painful or prolonged erection of the penis (called priapism), although extremely rare, must have immediate medical attention. If painful or prolonged erection occurs, call your doctor or go to an emergency room as soon as possible
    Incidence not known
    Abdominal or stomach pain
    area rash
    black, tarry stools
    bleeding gums
    blood in urine or stools
    chest pain or discomfort
    chills
    clay-colored stools
    cough
    dark urine
    diarrhea
    difficulty breathing
    difficult, burning, or painful urination
    fever
    general tiredness and weakness
    headache, sudden and severe
    inability to speak
    itching
    lab results that show problems with liver
    light-colored stools
    loss of appetite
    noisy breathing
    pain or discomfort in arms, jaw, back or neck
    pinpoint red or purple spots on skin
    rash
    seizures
    slow or irregular heartbeat
    slurred speech
    sore throat
    sores, ulcers, or white spots on lips or in mouth
    swollen glands
    temporary blindness
    tightness in chest
    unpleasant breath odor
    unusual bleeding or bruising
    upper right abdominal pain
    vomiting
    vomiting of blood
    weakness in arm and/or leg on one side of the body, sudden and severe
    wheezing
    yellow eyes and skin
    Severity: Minor
    Some of the side effects that can occur with doxazosin may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

    More common
    Headache
    lack or loss of strength
    unusual tiredness or weakness
    Less common
    Acid or sour stomach
    back pain
    belching
    bladder pain
    cloudy urine
    difficulty in moving
    frequent urge to urinate
    heartburn
    indigestion
    joint pain
    lower back or side pain
    muscle aching, cramping, or weakness
    muscle pains or stiffness
    nausea
    nervousness, restlessness, unusual irritability
    runny nose
    sleepiness or drowsiness
    sneezing
    sore throat
    stomach discomfort, upset or pain
    swollen joints
    Incidence not known
    Anxiety
    burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feeling
    change in frequency or urination
    dry mouth
    feeling of warmth
    frequent urination
    general feeling of discomfort or illness
    hair loss
    hives or welts
    hyperventilation
    increased urge to urinate during the night
    increased volume of pale dilute urine
    loss of appetite
    painful urination
    redness of skin
    redness of the face, neck, arms and occasionally upper chest
    shaking
    swelling of the breasts or breast soreness in both females and males
    thinning of hair
    trouble in holding or releasing urine
    trouble sleeping
    waking to urinate at night
    weight loss
  • (oral tablet, extended release, oral tablet)