Killer drug here

A drug linked to deaths overseas has been found in New Zealand for the first time. High Alert, the warning system for dangerous drugs, said metonitazene, a highly potent opioid, had been detected in a yellow powder, likely from crushed tablets. Effects include severe nausea, sweating, slowed breathing, cold and clammy skin, pinpoint pupils and loss of consciousness. ‘‘A lethal dose . . . is equivalent in size to a few grains of salt, meaning there is no way to accurately dose this substance.’’