Avanafil Stendra. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. The body takes longer to absorb it after a high-fat meal or alcohol. This medication is taken with or without food an hour before sex. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. Clinically proven to help you get an erection when you need it. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take.Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles . Sildenafil (Viagra) may interact with certain medications or supplements. Always let your doctor and pharmacist know about any other medications or supplements (including . 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.