"The deaths are a very tiny tip of what is a very huge iceberg," he says. Xanax is used to treat anxiety and panic attacks. It is not available on the NHS. It is a powerful tranquiliser.

One teacher said he feared pupils had made an assumption that taking Xanax was safer than using illegal drugs. Xanax, the brand name for the drug Alprazolam, is used to treat anxiety and panic ...