What are its side effects?

There are some side effects of using Viagra that you need to notice. It is possible to have dizziness, headache, flushing, or stomach trouble. Vision changes such as increased sensitivity to light, blurred vision, or difficulty distinguishing between blue and green colors may also happen. Inform your doctor or pharmacist right once if any of these effects continue or worsen.

Remember that your doctor has prescribed this medication as your doctor has judged that the benefit to you is greater than the risk of side effects. Many persons who use this drug have no serious side effects.

Sexual activity may put greater strain on your heart, particularly if you have heart problems. If you have a heart problem and develop any of the following dangerous side effects while having sex, stop immediately and seek medical assistance: extreme dizziness, fainting, chest/jaw/left arm pain, nausea.

Rarely, one or both eyes may experience sudden decreased vision, including irreversible blindness. If this significant condition develops, stop sildenafil immediately and seek medical care. Rarely, a sudden decrease or loss of hearing may occur, along with ringing in the ears and dizziness. If you have any of these side effects, stop taking sildenafil immediately and consult a doctor.

If you get a painful or lengthy erection that lasts 4 hours or more, stop using this drug immediately and seek medical help. It is uncommon for this drug to cause a severe allergic reaction. However, if you detect any symptoms of a major allergic response, such as a rash, itching/swelling (particularly of the face/tongue/throat), extreme dizziness, or difficulty breathing, get medical help right away.

This is not a complete list of potential negative effects of Viagra. Contact your doctor or pharmacist if you experience any other side effects not listed above.