Children younger than 1 year of age—Use and dose must be determined by your doctor. Some illegal “street” drugs called “poppers” such as amyl nitrate, butyl nitrate, or nitrite. Keep from freezing. Its effects might last longer if you have mild to moderate ED. Using this medicine with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes . Sildenafil oral tablet is used to treat erectile dysfunction (ED). It’s also used to treat pulmonary arterial hypertension (PAH). What is sildenafil? Sildenafil is a .