Answer: Sildenafil is the generic name for Viagra. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. Box , Mission, KS If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer. But plenty of men willingly pay more for Viagra because they like to use the name brand. Is Sildenafil just a cheaper version of Viagra? Our experts can discuss options with you, and adjust your treatment to fit around you. Find answers What does Viagra do? · Sildenafil for oral suspension contains sildenafil, which is the same medicine found in another medicine called VIAGRA ®. VIAGRA is used for the treatment of . This means that 4 hours after you take a dose, your body has cleared half of the dose. In most cases, it takes about 5 half-lives for your body to completely remove a Missing: packaging.  · Brand names: Revatio, Viagra Drug classes: Agents for pulmonary hypertension, Impotence agents. Medically reviewed by Kaci Durbin, MD. Last updated Missing: packaging.