1. COMPLEX ACTION OPIOIDS
a. Agonist-antagonists (κ-analgesics)
Nalorphine
Pentazocine
Nalbuphine
Butorphanol
b. Partial/weak μ agonist + κ antagonist
Buprenorphine
2. PURE OPIOID ANTAGONISTS
Naloxon
Naltrexone
Nalmefene
COMPLEX ACTION OPIOIDS & OPIOID ANTAGONISTS