AN 355 is White, Oval, and has been identified as Sildenafil Citrate 100 mg. Amneal Pharmaceuticals LLC supplies it. AN 355 pills are known to relax the muscles of the blood vessels, leading to increased blood flow in particular areas of the body. Many people buy 1A1 pills in the treatment of Erectile dysfunction and belong to the drug classes agents for pulmonary hypertension, and impotence agents. Most importantly there is no risk in pregnancy. It contains Sildenafil as its main active ingredient.  Erectile dysfunction is common for every man. they are known to relax the muscles of the blood vessels which leads to increased blood flow in the particular areas of the body.