https://www.petmd.com/cat/conditions/poisoning-toxicity/c_ct_amitraz_poisoning
Amitraz Poisoning in Cats | Tick Collar Poisoning | PetMD
Amitraz is a chemical that is used as a tick preventive in many formulations, including tick collars and dips. It can also be toxic to cats.
amitrazpoisoningcatstickcollar