Medical staff shows on February 26, 2020 packets of a Nivaquine, tablets containing chloroquine and Plaqueril, tablets containing hydroxychloroquine, drugs that has shown signs of effectiveness against coronavirus.

An Arizona man has died after ingesting chloroquine phosphate — believing it would protect him from becoming infected with the coronavirus. The man's wife also ingested the substance and is under critical care.

The toxic ingredient they consumed was not the medication form of chloroquine, used to treat malaria in humans. Instead, it was an ingredient listed on a parasite treatment for fish.