Pharmacology of Opiates - Lessons Learned-Pharmacology of Opiates

Video Transcription

Video Summary

Randall Tackett, a pharmacologist/toxicologist at the University of Georgia, reviews opioid pharmacology and how lessons from the opioid epidemic apply to dentistry. He notes that U.S. drug deaths—driven largely by prescription narcotic overdoses—surpassed traffic fatalities, prompting greater scrutiny of opioid prescribing. Dentistry historically contributed to overprescribing, and studies found a high proportion of emergency-room opioid prescriptions were for dental complaints. However, opioids are not first-line therapy for most dental pain because dental pain is often inflammatory, while opioids are analgesic but not anti-inflammatory.<br /><br />Tackett outlines major opioid risks: emergency visits, hospitalization, and overdoses requiring naloxone; heightened misuse risk in patients with depression/anxiety; and elevated long-term substance use risk when adolescents and young adults are exposed—even after limited prescriptions. High-risk prescribing patterns include >3 days’ supply for opioid-naïve patients, ≥50 morphine milligram equivalents/day, and co-prescribing with benzodiazepines, which increases sedation and respiratory depression.<br /><br />Pharmacologically, opioids act mainly at μ (mu) receptors, producing analgesia, euphoria, sedation, and potentially fatal respiratory depression. Classic overdose signs include the “opioid triad”: somnolence, respiratory depression, and pinpoint pupils. Other adverse effects include nausea/vomiting, constipation (often without tolerance), histamine-related itching/hives, and withdrawal with abrupt cessation after dependence.<br /><br />He reviews specific agents (morphine, methadone’s long half-life and accumulation risk, fentanyl’s high potency, codeine’s variable metabolism, buprenorphine’s mixed activity and FDA dental warnings, and tramadol’s unique risks). Naloxone (Narcan) rapidly reverses overdose but may require repeat dosing due to its short duration.<br /><br />He closes with 2024 dental guidelines: use non-opioids first-line (NSAIDs ± acetaminophen), avoid “just-in-case” opioid prescriptions, reserve opioids for failures/contraindications, and use extreme caution in youth.

Keywords

opioid pharmacology

dentistry opioid prescribing

opioid epidemic lessons

dental pain inflammation NSAIDs acetaminophen

mu opioid receptor

opioid overdose triad

naloxone Narcan reversal

high-risk opioid prescribing patterns MME benzodiazepines

adolescent opioid exposure long-term risk

2024 dental opioid guidelines