Papaverine is a vasodilator that relaxes smooth muscles in your blood vessels to help them dilate (widen). This lowers blood pressure and allows blood to flow more easily through your veins and arteries.

Papaverine is used to treat many conditions that cause spasm of smooth muscle. This includes chest pain, circulation problems, heart attack, or disorders of the stomach or gallbladder.

Papaverine is not for use in treating erectile dysfunction (impotence) and should not be injected into the penis. This practice has resulted in painful or prolonged erection that may require surgery to correct.

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  • papaverine
  • Rare
    Abdominal pain or tenderness
    blurred or double vision
    change in ability to see colors, especially blue or yellow
    clay-colored stools
    dark urine
    decreased appetite
    deep, slow breathing
    drowsiness
    fatigue
    fever
    headache
    insomnia
    itching
    loss of appetite
    nausea and vomiting
    painful or prolonged erection of the penis
    skin rash
    swelling of the feet or lower legs
    trouble with breathing
    unusual tiredness or weakness
    vomiting
    weakness
    yellow eyes or skin
    Some papaverine side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

    Less common
    Constipation
    diarrhea
    dizziness or lightheadedness
    fainting
    fast, pounding, or irregular heartbeat or pulse
    feeling of constant movement of self or surroundings
    flushed face
    itching skin
    nervousness
    palpitations
    pounding in the ears
    sensation of spinning
    sleepiness or unusual drowsiness
    slow or fast heartbeat
  • Tablet