Dexmedetomidine to control signs associated with lisdexamfetamine dimesylate toxidrome in a cat

A 5-month-old intact female domestic shorthaired cat had mydriasis, agitation, and increased locomotion after ingestion of lisdexamfetamine, 10.3 mg/kg body weight (BW). Despite treatment with IV fluids, IV acepromazine, oral cyproheptadine and intravenous lipid emulsion the patient's clinical signs worsened. Dexmedetomidine administered at 2 μg/kg BW and continued at 0.5 μg/kg BW per hour rapidly controlled the patient's signs. An episode of vomiting and hematuria developed. Follow-up 5 days after discharge revealed that the cat appeared normal.