he AN 355 pill is a prescription medication used for erectile dysfunction (ED) or impotence in men, as well as pulmonary arterial hypertension (PAH). AN 355 is also known as “Sildenafil 100 mg”. This medication is classified within the category of PDE-5 inhibitors. The active ingredient in the AN355 Pill is Sildenafil. 355 Pill is a very effective medication for sexual disorders and impotence in men