About 550 men around the world were taking Viagra for over 1 year, and about 3700 men of different ages (19-87) were treated with it during its pre-marketing clinical trials.
When men took Viagra as recommended in flexible-dose, some of them reported changes in vision (predominantly color tinge to vision, and sensitivity to light); headache, dizziness, rash, urinary tract infection, dyspepsia, flushing and nasal congestion. Men who exceeded the recommended dose reported the identical side effects more frequently.
Fixed-dose studies showed that the most common side effects at 100 mg doses were abnormal vision and dyspepsia.
Post-Marketing Reports
Many of the patients preexisting cardiovascular risk factors reported the following side effects associated with taking Viagra: hypertension, myocardial infarction, pulmonary hemorrhage, etc. The most severe side effect reported was sudden cardiac death; however it wasn’t possible to conclude whether it was related directly to Viagra.
Among other serious side effects, that might be associated with Viagra, were sudden decrease or loss of hearing, anxiety, amnesia, long-lasting erection, decreased or loss of vision, bleeding, and seizure. Many, but no all, of men who reported these problems had diabetes, hypertension and other risk factors.
Loading ...