The virility drug Viagra has gone on sale in Kenya.

Kenyan television said the pill - which combats impotence in men - would sell for between five hundred and six hundred Kenyan shillings per tablet Viagra, made by Pfizer Laboratories in France, is available in most European countries for between nine and fifteen dollars, but a thriving black market has developed.

Kenya is one of the few African countries where Viagra is legally available.