Viagra is extremely safe and offers very few side effects. As with any drug product, there are side effects of the product in some people. The most commonly reported are: headache, flushing, stomach ache, urinary tract infection, diarrhea, dizziness, rash, and mild and temporary visual changes (color perception changes, light perception changes, and blurred vision). Stomach ache and abnormal vision were more common at 100 mg than at lower doses.
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