Many people especially the men that are suffering from impotence or erectile dysfunction are very curious about Viagra. What is Viagra and how it is effective? Pfizer, which is a huge pharmaceutical company, manufactures Viagra. Many people generally believe Viagra is a breakthrough treatment for erectile dysfunction among men. They feel that it is a magic pill that can improve their sex lives. Viagra is not a magic pill or an aphrodisiac. It is an anti-impotence drug. Viagra is a prescription drug and only those men who suffer from erectile dysfunction can take it that too after obtaining a prescription from a doctor. This drug contains sildenafil, the main ingredient in Viagra tablets. It is a PDE5 inhibitor and acts to regulate the flow of blood in and around penis. Men who are already taking nitrate medication for other medical conditions and suffer from erectile dysfunction problem should avoid intake of generic viagra. This drug can cause serious complications on combination with nitrate drugs and lead to drop in blood pressure levels among users.
