Several men pop Viagra to beat erectile dysfunction or to last longer in bed. They do not realise that it could have side-effects if you do not take the right dosage. Dr Vijayasarathi a medical sex expert lists down pointers to use it the right way. What is Viagra? Sildenafil is the name of a drug that is used for treating erectile dysfunction and is sold in different brand names in India. Readers should understand that Viagra is one such brand that was orignally manufactured by a pharma company (Pfizer) in late 1990s supported with plenty of research. Colloquically and