Death usually occurs from exhaustion or anoxia during a tetatanic seizure. The entire syndrome, if untreated last less than 2 hours. The cat is only marginally savable if it has not reached the convulsion stage. If not convulsing, induce vomiting immediately, then transport to your vet for further treatment. There are many insecticides, and I will discuss the most common ones.
Amitraz poisoning occurs from ingestion of a tick collar.
Treatment involves emensis, activated charcoal, and cathartics, or physical retrieval of the collar through endoscopy, and repeated injections of yohimbine to reverse amitraz's adrenergic agonist effects. Pyrethrins and pyrethyoids are used to treat ectoparasites of cats, dogs and birds. However, if used improperly they will cause severe illness. The primary action is to keep the sodium channel open in excitable cells. The onset of toxicosis occurs within 1 to 4 hours after dermal and subsequent oral exposure.