To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you. Do not keep outdated medicine or medicine no longer needed. Sildenafil may cause side effects. It might work longer if you have mild to moderate erectile dysfunction. Medicines that block an enzyme called CYP3A4. It continues to work for up to 4 hours, although its action is usually less after 2 hours. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED.Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). Viagra can cause side effects that range from mild to serious. . The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called . Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in .
