Tadalafil is an oral drug used for treating impotency. It falls into the drug classification of phosphodiesterase inhibitors which would also include such drugs as Sildenafil, which is generic for Viagra
and Vardenafil, which is generic for Levitra. An erection happens when the penis is allowed to fill with blood that the blood vessels bring. This is what causes the penis to become bigger and harder. Once the blood vessels let the blood flow away from the penis the penis will again become flaccid. When a man becomes sexually stimulated there is a release of nitric oxide to the penis and this is what allows an erection. Tadalafil relaxes muscles and increases blood flow to particular areas of the body.
Tadalafil was approved by the FDA in November, 2003 and is only available by prescription. Tadalafil is available in 5, 10, and 20 mg tablets. Always take Tadalafil just as the doctor prescribes it for you, never take more or continue to take it for longer than you are supposed to. It will not work any better and actually could cause a negative reaction. Tadalafil can be taken with or without food and is usually taken just prior to any sexual activity. Tadalafil will allow an erection when sexual stimulation happens not just by taking the pill itself.
In December of 2003, the FDA approved Tadalafil as a generic for Cialis in the US. It was the third erectile dysfunction drug that was released following Viagra and Levitra. Many do not know this but pharmaceutical laboratories have been looking at the possibility of being able to treat pulmonary arterial hypertension with Tadalafil.
In May of 2002, Lilly ICOS announced to the American Urological Association that Tadalafil would be effective for up to 36 hours. That was extremely impressive news because it gave Tadalafil a huge edge on the two other competitors, Viagra and Levitra. Tadalafil (Cialis) was later given the nickname of “The Weekender” because one dose could allow sexual gratification for the entire weekend which offered something that other ED drugs do not and that is spontaneity.

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