Patients should always ask their doctors for medical advice about adverse events. Egypt Egypt approved Viagra for sale in , but soon afterwards allowed local companies to produce generic versions of the drug, citing the interests of poor people who would not be able to afford Pfizer’s price. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. By controlling the enzyme, sildenafil helps to maintain an erection after the penis is stroked. Rarely reported side effects include: an erection that will not go away priapism.Sildenafil, sold under the brand name Viagra, among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4] [8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud’s phenomenon. [9] It is unclear if it is effective for treating sexual dysfunction in females. [8]. What is Sildenafil (Viagra)? Drug Facts. Common Brands Viagra. Drug Class PDE-5 inhibitor. Controlled Substance Classification Not a controlled medication. . AdFree & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly. If appropriate, get a prescription for ED from Rex MDK+ visitors in the past monthService Catalog: ED Pills, Erectile Dysfunction, Sexual Health and more.