One in six American soldiers in Afghanistan and one in eight in Iraq are taking daily doses of prescription antidepressants, sleeping pills or painkillers to help them cope with the stresses of combat, according to figures contained in a US Army mental health advisory team report seen by The Herald.

The findings mean that at least 20,000 troops are on medication such as Prozac or diamorphine while serving in the front line or on equally dangerous convoy escort or driving duties in conflicts where insurgents regularly target the supply chain.

While the vast majority would have been barred automatically from combat roles in earlier wars on medical and safety grounds, the pressure to provide up to 200,000 soldiers at any given time for the two major deployments has led to a relaxation of the rules.

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