Viagra Side Effects

Common side effects in this group include diarrhea and upset stomach.
Less common cases include vomiting, gastritis, dry mouth, bleeding in the rectum, abdominal pain, difficulty in swallowing, irritation, or swelling of the esophagus (happens mostly to men who have idiopathic achalasia), atypical liver function tests, viral infection of the mouth, inflammation of the colon, periodontal disease, and infection of the tongue.