Levitraź (vardenafil hydrochloride trihydrate) was co-developed by Bayer Pharmaceuticals and GlaxoSmithKline as a challenger in the competitive male impotence pill market that has been dominated by Viagra since its launch in 1998.

Levitra is similar to Viagra and Cialis. They are all PDE-5 inhibitors that relax the muscles and blood vessels in the penis, resulting in a natural erection.

Impotence (or erectile dysfunction) is defined as the inability to achieve or maintain an erection sufficient for sexual intercourse, and includes the inability to get an erection as a result of sexual stimulation or to lose your erection prior to ejaculation.

Male impotence does not generally include other symptoms such as lack of libido, inability to ejaculate or the inability to achieve orgasm.

Levitra was introduced in Europe in early 2003 and received FDA approval for use in the US late in 2003.