Viagra may not be that wonderful after all...

Viagra doesn't work for half of all men who take it, leading doctors warn.

They say the NHS is wasting tens of millions of pounds every year on tablets which don't treat the cause of problem.

Many of the men handed prescriptions by their GP are actually suffering from low testosterone levels, which cannot be treated by Viagra alone.

This is because the impotence pill is dependent on the sex hormone in order for it to work in the first place. More...

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