The pill with imprint 477 (White, Round, 9mm) has been identified as Vardenafil Hydrochloride Orally Disintegrating 10 mg and is used for Erectile Dysfunction. It belongs to the drug class impotence agents and is not a controlled substance. Take this medication by mouth. Place the tablet on the tongue and allow it to dissolve, then swallow. The tablet will dissolve rapidly. Do not crew, crush, or split the tablet.