an 351 pill {White Round Pill} For Men Or Women | an 351 pill is White and round and has been identified as Sildenafil Citrate 20 mg. Amneal Pharmaceuticals supply it. Sildenafil is used in the treatment of Erectile Dysfunction and pulmonary Arterial Hypertension and belongs to the drug classes agents for pulmonary hypertension, and impotence agents.