Full Name: Carfentanil
Synonyms: CFTL
Carfentanil is an ultra-potent synthetic opioid structural analog of fentanyl. It acts as a high-affinity full agonist at mu-opioid receptors, exhibiting quantitative potency ~10,000 times greater than morphine. It causes rapid respiratory depression, sedation, and analgesia, used exclusively in veterinary immobilization of large animals. Its structure contains a 4-carbomethoxypiperidine fentanyl derivative.