Viagra is the most popular and commonly used drug for men. It is available in many strengths, Viagra 150 mg is one of them. This drug is the semi-highest dose of the Viagra family. 150 mg of Viagra is also known by the brand name Sildenafil 150 mg, which means Viagra is marketed as the brand name for Sildenafil. Except for Viagra, Sildenafil is also marketed under another brand name Revatio.