Viagra is prepared in typical shaped tablet form of blue color in three different strengths of 25mg, 50mg and 100mg. the drug Sildenafil Citrate is being sold only against the specific prescription of the registered medical practitioners, though it was advertised directly on the Television in the United States. There are plenty of websites on the internet nowadays that offer this drug under various schemes. The brand has been so popular that many other producers have launched their products to be known as ?Herbal Viagra? in similar shaped and colored tablets only. The drug has several nick names like the vitamin pill or the blue pill etc.