Joe McCrisken says he is signing off an alprazolam-related death nearly once a week. He says "most of the deaths" are caused by counterfeit versions of Xanax, the brand name for the drug alprazolam.

Xanax, the brand name for the drug Alprazolam, is used to treat anxiety and panic attacks. It is widely prescribed in the US and can be obtained on private prescription in the UK. But among some ...