Pharmaceutical giant Pfizer, said it was "disappointed" the eight-year-long study showed that Viagra is not useful in treating female sexual disorders

It said it will not be seeking approval from drug regulators in the US to make Viagra available to women, it is one of most popular drugs in the world for the treatment of erectile dysfunction among men.

Pfizer, said its scientists carried out tests of Viagra on about 3,000 women since 1996, Some of the women tested were issued with placebos and some with official Pfizer Viagra. While it was found to be harmless, its degree of effectiveness could not be conclusively determined.

"While we were disappointed that the FSAD [female sexual arousal disorder] programme was not more successful, this is the nature of development," said Global Pharmaceuticals president for Pfizer's Karen Katen. Pfizer also said it is studying other forms of treatment for Male Impotence.

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