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Fifteen years ago a new "wonder" drug was first approved for use. It marked a breakthrough in the treatment of male impotence. We speak to two men who helped develop Viagra.

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9 minutes

Last on

Fri 8 Mar 201303:50GMT

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  • Thu 7 Mar 201309:50GMT
  • Thu 7 Mar 201312:50GMT
  • Thu 7 Mar 201320:50GMT
  • Thu 7 Mar 201323:50GMT
  • Fri 8 Mar 201303:50GMT

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