If you are taking sildenafil for erectile dysfunction, you are unlikely to miss a dose since this medication is taken as needed, not on a regular dosing schedule. Other research stated that there’s “inconsistent or limited-quality patient-oriented evidence” for its benefits. Shake the liquid well for 10 seconds before each use to mix the medication evenly. This increased blood flow can cause an erection. Online ED consultations offer privacy, convenience, and affordability while allowing you to quickly get the medications you need—the same day, with some services. It can take several weeks to start working. Sildenafil is in a class of medications called phosphodiesterase PDE inhibitors.Though often called “female Viagra,” Addyi (flibanserin) and Vyleesi (bremelanotide) are designed to enhance sexual desire in females, but they do not affect physical performance. Viagra (sildenafil) is not approved for use in females. Viagra and similar drugs treat erectile dysfunction (ED). They boost sexual performance in males by . In most males,* Viagra works within 1 hour after it’s taken. It’s possible that Viagra can begin working within 30 minutes of being taken. But other times, it may take up to 4 hours to start. 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.