Viagra (sildenafil) is an oral medication that treats erectile dysfunction (ED). It works by causing more blood flow to the penis. This helps you to achieve and maintain an erection. You can take Viagra 30 minutes to 4 hours before sexual activity. But it shouldn t be taken more than once daily. For most men, Viagra begins to work within an hour. In 2024, Viagra Connect, a particular formulation of Sildenafil marketed by Pfizer, became available for sale without a prescription in the UK, in an attempt to widen availability and reduce demand for counterfeit products. Usual Adult Dose for Erectile Dysfunction. TABLETS (Viagra) Initial dose: 50 mg orally once a day, as needed, about 1 hour prior to sexual activity. Maintenance For most men, the recommended dose is 50 mg. Your doctor will start you on the VIAGRA dose he or she thinks is right for you. Based on effectiveness and toleration pfizer viagra for men<\/a> VIAGRA works for men with ED by increasing blood flow to the penis so you can get and keep an erection hard enough for sex. VIAGRA only works when you are sexually stimulated. It has been proven to help guys with various degrees of ED. The sildenafil compound was originally developed by Pfizer for the treatment high blood pressure (hypertension) and angina pectoris (chest pain due to heart disease). During the heart clinical trials, researchers discovered that the drug was more effective at inducing erections than treating angina. <\/p>\n Maria Hudson. 4 hrs. ago. Anna Nelson. 6 hrs. ago. David Muldon. 8 hrs. ago Viagra (sildenafil) is approved to treat sexual dysfunction in men by the U.S. Food and Drug Administration (FDA), but it is sometimes prescribed to women off-label, which means without approval by the FDA. Viagra is an effective drug for treating male erectile dysfunction, but it targets sexual performance, not sexual arousal.<\/p>\n