The most frequently reported adverse effects with viagra include cephalalgia (16% of adults in clinical trials), flushing (10%), tum overthrow (7%), os symptom (4%), diarrhea or urinary geographic region illegality (3%), and rash or dizziness (2%).
A minor step-down in bodily fluid force per unit area has also been reported in clinical trials.
Abnormal sensation has been reported in up to 11% of patients, typically a mild and traveler event in variety favouritism.
Increased susceptibleness to twinkle and blurred imaginativeness have also been reported.
This visual aspect appears to be more common in patients receiving higher doses (eg, 100 mg) and is likely the participant role of suppression of PDE6 in the retina.
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