Generic Viagra is also known as sildenafil citrate. This is nothing but ordinary pills. These pills are used as a drug to treat pulmonary arterial hypertension. This was the original reason for the development of such a pill. But after the manufacture of generic viagra it was discovered that it is also used to treat erectile dysfunction. This was first manufactured and developed by the Pfizer Company. This was the first company to manufacture this pill. These are usually taken by men who are a bit weak sexually. Generic cialis is yet another pill that is also a kind of Viagra that was developed in the recent past. This generic cialis Viagra contains tadalafil. This is completely present in the pill. This also solves the problem of sexually downtrodden men. This is thus a popular one and is in widely in usage amongst the people. These Viagra can be purchased anywhere and at any time. This can also be bought through online also. The viagra online is very simple. There are many websites available through they can be purchased and the dealers get them to our door step. They do home delivery. But charges are laid for that also. This can be done through credit cards.