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.
Abdominal pain or tenderness
blurred or double vision
change in ability to see colors, especially blue or yellow
deep, slow breathing
loss of appetite
nausea and vomiting
painful or prolonged erection of the penis
swelling of the feet or lower legs
trouble with breathing
unusual tiredness or 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:
dizziness or lightheadedness
fast, pounding, or irregular heartbeat or pulse
feeling of constant movement of self or surroundings
pounding in the ears
sensation of spinning
sleepiness or unusual drowsiness
slow or fast heartbeat