Viagra

Available for over a year

In March 1998, a new 'wonder' drug was first approved for use. It marked a breakthrough in the treatment of male impotence. We hear from two men who helped develop Viagra: Dr Ian Osterloh, who worked for the drug company Pfizer and consultant urogolist, Clive Gingell, who conducted the first clinical trials. (Photo: Viagra pills. Credit:Getty Images)