Viagra

Viagra is currently one of the most famous and popular drugs used for the treatment of erectile dysfunction (ED). The authentic Viagra is produced and marketed by the Pfizer company and, according to the statistics, about 9 pills of this drug are dispensed every second in the world. Although most of the side effects of Viagra are rare and mild, in some cases it may lead to a heart attack. In fact, heart attack is the primary reason why you need a prescription to buy a Viagra: so you do need a doctor to take a look at your medical history before purchasing and taking this drug. In some cases patients experience long-lasting painful erection that requires medical attention.

It may rarely have an impact on color vision: some people reported changed color perception, to be more specific - the way green and blue colors are perceived was different. People taking drugs for angina (nitroglycerin) should be especially careful with Viagra as the combination could be fatal. Viagra has been also reported to cause dependency in some people taking it without need – young healthy men who just use the drug to “support” their sexual performance even though they are not diagnosed with ED.