Carfentanil Toxicity in the African Green Monkey: Therapeutic Efficacy of Naloxone.

Carfentanil Toxicity in the African Green Monkey: Therapeutic Efficacy of Naloxone. Toxicol Lett. 2020 Feb 15;: Authors: Langston JL, Moffett MC, Makar JR, Burgan BM, Myers TM Abstract Carfentanil is an ultra-potent opioid with an analgesic potency 10,000 times that of morphine but has received little scientific investigation. Three experiments were conducted to evaluate the toxicity of carfentanil and the efficacy of naloxone in adult male African green monkeys. The first experiment determined the ED50 (found to be 0.71 µg/kg) of subcutaneous carfentanil for inducing bradypnea and/or loss of posture. Experiment 2 attempted to establish the ED50 of naloxone for rapidly reversing the bradypnea/loss of posture induced by carfentanil (1.15 µg/kg). Experiment 3 evaluated the effects of carfentanil (0.575 µg/kg) alone, the safety of naloxone (71-2841 µg/kg), and the efficacy of naloxone (71-710 µg/kg) administration at two time points following carfentanil (1.15 μg/kg) on operant choice reaction time. Collectively, these experiments characterized the temporal progression of carfentanil-induced toxic signs, determined the range naloxone doses that restored respiratory and gross behavioral function, and determined the time course and range of naloxone doses that partially or completely reversed the effects of carfentanil on operant choice reaction time performance in African green monkeys. These results have practical rele...
Source: Toxicology Letters - Category: Toxicology Authors: Tags: Toxicol Lett Source Type: research