Nowadays, it is difficult to read a magazine or watch a television program without seeing some reference to Viagra. This drug, which is used to treat a common condition called erectile dysfunction or male impotence, has remained very popular ever since it appeared on the market in 1998. Viagra is a drug that comes in the form of small, diamond-shaped tablets. They are light blue in colour and are marked Pfizer on one side in blue and VGR 25, VGR 50 or VGR 100 in blue on the other. This reflects the specific dosage of the drug. Don’t purchase medication if it is not blue or does not contain the above indicators, as it may not be authentic.