Men are being warned they could be "gambling with their lives" if they buy fake medicines online.
Dr David Gillen, medical director for the drug company Pfizer, warned men were more likely to "bypass" the NHS in order to obtain treatments anonymously.
A survey by Pfizer of 900 men over 35 found one in 10 had bought prescription medicines without a script.
The UK’s medical regulator said buying medicines online was not illegal, but added it was "not a good idea".
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