TY - CHAP M1 - Book, Section TI - Chapter 31. Opioid Analgesics & Antagonists A1 - Trevor, Anthony J. A1 - Katzung, Bertram G. A1 - Kruidering-Hall, Marieke M. A1 - Masters, Susan B. PY - 2013 T2 - Katzung & Trevor's Pharmacology: Examination & Board Review, 10e AB - The opioids include natural opiates and semisynthetic alkaloids derived from the opium poppy, pharmacologically similar synthetic surrogates, and endogenous peptides. On the basis of their interaction with opioid receptors, the drugs are classified as agonists, mixed agonist-antagonists, and antagonists. SN - PB - The McGraw-Hill Companies CY - New York, NY Y2 - 2024/03/28 UR - accesspharmacy.mhmedical.com/content.aspx?aid=56982488 ER -