Accidental Organophosphate Poisoning in a Patient Due to a Bed Bug Pesticide in the United Kingdom: A Case Report.

Organophosphate (OP) compounds, developed during World War II, are a group of chemicals used as pesticides, insecticides and herbicides. As irreversible inhibitors of the enzyme acetylcholinesterase (AChE), they reduce anti-cholinesterase activity and therefore increase acetylcholine (ACh) levels at the neuromuscular junction (NMJ). Diazinon, the OP leading to the patient's symptoms in this report, is an amber-brown liquid that was once the most widely used insecticide in the United States of America.