Athletes 'take Viagra to improve performance'

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Professional athletes are turning to the impotency drug viagra to aid performance in explosive power events like sprinting, experts believe.

Traces of the drug in competitors' urine samples are becoming so widespread the World Anti-Doping Agency (Wada) is considering adding Viagra to the list of substances banned in international sports.

Christian Ayotte, head of a Wada-accredited laboratory in Montreal, Canada, said she regularly identifies Viagra, and other similar drugs, in urine samples from male athletes.

"Each time there is a seizure of banned drugs you can be sure that there's Viagra and cialis found as well," she said.......

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