Viagra is a medicine to relax muscles and increase the flow of blood to certain body areas.
Viagra treats men with impotence (erectile dysfunction). Your physician may use the medicine to treat certain other conditions not listed here.
You should not take Viagra together with nitrate drugs. This may cause a serious blood pressure reduce, heart attack, stroke. If you have nausea, fainting, dizziness, chest, neck, or arms pain, vision or hearing loss (sudden), ringing in the ears, sweating, nausea, irregular heartbeat, body swelling, breath shortness, painful or prolonged penis erection (4 hours or more) contact your physician straightway. It may lead to serious side effects.
Also consult your physician in case of allergy signs, including breathing difficulty, hives, face swelling. You may also experience less serious side effects like chest, neck, face warmth/redness, headache, stuffy nose, problems with memory, upset stomach, pain in your back.
Take Viagra not more than one time a day (allow 24 hour break before taking another doze).