Men with erectile dysfunction (ED), a disorder that impairs one's capacity to achieve or maintain an erection, can take the prescription medication Levitra/Vardenafil. Being a phosphodiesterase 5 type inhibitor (PDE5), it belongs to the same drug family as other well-known ED medications like Cialis and Viagra. Since 2003, Levitra has been marketed as a treatment for erectile dysfunction. More recently, Vardenafil, a generic version of Levitra, has become accessible.