Similar findings were also reported in a study conducted in Brazil 6 , and this could be because men with multiple sexual partners may be attempting to impress their partners with prolonged sexual periods 7 , 8. Objectives: Explain the mechanism of action of sildenafil in the treatment of erectile dysfunction and pulmonary arterial hypertension. Shake the liquid well for 10 seconds before each use to mix the medication evenly. Before taking sildenafil, tell your doctor and pharmacist if you are allergic to sildenafil, any other medications, or any of the ingredients in sildenafil tablet or suspension. However, these diseases are usually not common at a younger age and thus younger men will usually tend to use sildenafil to impress or satisfy their partner rather than treat ED.Viagra vs. sildenafil. Viagra is a brand-name medication that contains the active drug sildenafil. This active drug comes as a generic medication, too. Sildenafil and brand-name Viagra are both. – starting at $4 per dose of sildenafil, depending on dosage: 25– mg: Roman: yes: yes – $90 per dose of Viagra – $4–$10 per dose of sildenafil, depending on dosage: 25– mg. The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS See risks & benefits. Learn more about what VIAGRA® (sildenafil citrate), a prescription treatment for ED.