All drugs (Levitra, Cialis and Viagra) work essentially the same way and have similar side effects. Levitra may work a little faster in some people and may be less sensitive to food or alcohol intake. Viagra has been around for a lot longer and has a proven safety track record

It is not safe to take Levitra, Cialis and Viagra together. You should only take one or the other. They are similar drugs, so it makes sense to try all three, on different days, and see which works best for you.
VIAGRA works in as quickly as 30 minutes and lasts for about 4 hours.

CIALIS works up to 36 hours and work in some men as fast as 30 minutes

LEVITRA is as fast as 25 minutes and its effect lasts for nearly 24 hours

If Viagra doesn't work for you, it's worth giving Cialis or Levitra a try. Each person is different, and your body may respond better to Cialis and Levitra than Viagra.

It's important to note that the maximum dose for Viagra is 100mg while the maximum dose of Levitra and Cialis is 20mg
[...]

Drug Uses

Levitra (Vardenafil) is an oral therapy for the treatment of erectile dysfunction. It is a phosphodiesterase inhibitor that works by helping the blood flow into the penis to achieve and maintain an erection.

How Taken

Levitra should be taken as needed, about an hour before sexual activity, but Some form of sexual stimulation is needed for an erection to occur with generic Levitra. Levitra should not be taken more than once daily.

[...]