Emergency room doctors in the Canadian cities of Calgary and Edmonton are being warned about the police seizure of shipments of the illegal drug W-18, which is believed to be 10,000 times as potent as morphine.
The drug, a synthetic opioid patented in 1984 in the United States and Canada, is being manufactured in labs in China. It produces a euphoria similar to that given by fentanyl.
The potency of W-18 makes it extremely profitable for drug-dealers.
