Side effects

Viagra (Sildenafil Citrate) Common Side effects

Tell your doctor or pharmacist if any of the following occurs: headache, flushing, stomach upset or nausea, heartburn, stuffy or runny nose, diarrhea, dizziness, or lightheadedness. An allergic reaction to this medicine is unlikely but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include rash, itching, unusual swelling, severe dizziness, or trouble breathing

A small number of men have lost eyesight in one eye some time after taking Viagra. This type of vision loss is called non-arteritic anterior ischemic optic neu-ropathy (NAION). NAION causes a sudden loss of eyesight because blood flow is blocked to the optic nerve.

We do not know at this time if Viagra causes NAION. NAION also happens in men who do not take these medicines. People who have a higher chance for NAION include those who:
- have heart disease
- are over 50 years old
- have diabetes
- have high blood pressure
- have high cholesterol
- smoke
- have certain eye problems

Stop using Viagra if you have a loss in your eyesight. Get medical help right away.