What are the side effects of Viagra?
Viagra® (sildenafil) is a medication used to treat men who have trouble getting an erection. It is generally used without any side effects.
Potential side effects
The most commonly reported side effects of Viagra® include headache, nasal congestion, upset stomach, and redness in the face or chest. These side effects tend to be mild and go away within a few hours after Viagra® use. Less common side effects include temporary changes in vision, such as trouble telling the difference between blue and green, seeing a bluish tint to objects, being more sensitive to bright light, and blurred vision. Be sure you talk to your doctor immediately if you experience side effects like sudden vision loss while taking Viagra® or similar medicines such as Cialis® (tadalafil) or Levitra® (vardenafil). Make sure you call your doctor if you experience an erection that lasts longer than four hours.
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