Pentazocine

**Definition:** The first mixed agonist-antagonist analgesic to be marketed. It is an agonist at the kappa and sigma opioid receptors and has a weak antagonist action at the mu receptor. (From AMA Drug Evaluations Annual, 1991, p97)

**Tree numbers:** - D03.132.577.249.106.700 - D04.615.723.795.106.700