Levitra acts in the same way as Viagra, by blocking an enzyme called phosphodiesterase-5, or PDE-5. This helps the smooth muscles in the penis to relax, which effectively increases blood flow.

Levitra is taken orally when needed between four and a half hours and 30 minutes before sexual activity. Take Levitra only as directed, usually once daily as needed. Levitra works along with sexual stimulation to help achieve an erection.