Feline Insecticide Toxicity Study Guide

Overview and Clinical Importance

Insecticide toxicity represents one of the most commonly encountered toxicoses in feline emergency medicine. Cats are uniquely susceptible to certain insecticides due to their deficient hepatic glucuronidation pathway, which impairs metabolism of many compounds that are relatively safe in other species. The three major classes of insecticides causing feline toxicosis are pyrethrins/pyrethroids, organophosphates/carbamates, and amitraz. Understanding the distinct mechanisms, clinical presentations, and treatment protocols for each class is essential for both clinical practice and NAVLE success.

Section 1: Pyrethrin and Pyrethroid Toxicity

Etiology and Source

Pyrethrins are naturally occurring insecticidal compounds derived from Chrysanthemum cinerariifolium (Dalmatian pyrethrum) and Chrysanthemum coccineum (Persian pyrethrum). Pyrethroids are synthetic derivatives with enhanced photostability and potency. Permethrin is the most clinically significant pyrethroid in feline toxicosis.

Primary exposure routes: The most common cause is inappropriate application of dog flea/tick products containing 40-65% permethrin to cats. Secondary exposure occurs through grooming contact with recently treated dogs or ingestion of flea collars.