PharmacologyLesson 2 of 2 in the course Pain Response Drugs

Opioid Pharmacology: Agonists, Risks, Dependence, and Antagonists

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

Save course
Lesson progress
0 / 5

Your progress is kept in this browser only.Sign up to save it

Summary

This lesson introduces opioid agonists, how they reduce pain, and the characteristics of several commonly used drugs. Understanding their benefits and risks helps nurses support safe, individualized pain management.

Opioid agonists activate opioid receptors, especially mu, delta, and kappa receptors found throughout the central nervous system (CNS). Activation modulates painful signals traveling from peripheral tissues and changes pain perception, often increasing the pain threshold. Opioid agonists are among the most potent analgesics and are used for moderate to severe pain. They can also suppress brain cough receptors, but their misuse and addiction risks generally make them a last-line option for cough.

All flashcards

How do opiate and opioid differ?
An opiate is derived from the opium poppy; opioid is broader and includes natural, semisynthetic, and synthetic drugs.
Why does CYP2D6 matter for codeine?
CYP2D6 converts codeine to morphine. Lower activity may reduce analgesia, while higher activity can increase morphine exposure and respiratory-depression risk.
What is a key concern with meperidine?
Its metabolite can accumulate, particularly with impaired renal function, and cause delirium or seizures.
What are basal pain and breakthrough pain?
Basal pain is persistent baseline pain; breakthrough pain is a temporary increase above that baseline.
How do naloxone and naltrexone differ in purpose?
Naloxone reverses suspected acute opioid overdose; naltrexone is used in treatment plans to support opioid abstinence.

Quiz questions

  1. How do opioid agonists reduce pain perception?Answer: They activate CNS opioid receptors, modulating painful signals and pain perception.
  2. A person who may have overdosed on opioids is unresponsive and breathing slowly. What response is appropriate?Answer: Give naloxone if available, call emergency services, and obtain urgent medical care.
  3. Which pattern most clearly distinguishes opioid use disorder from tolerance during prescribed therapy?Answer: Compulsive opioid use that continues despite significant harm.
  4. Why can combining opioids with alcohol or benzodiazepines be dangerous?Answer: The combination can intensify sedation and respiratory depression.
  5. What effect can morphine-related histamine release cause in susceptible people?Answer: Flushing, itching, and hypotension.

Based on Pharmacology for Nurses by Tina Barbour-Taylor, Leah Mueller (Sabato), Donna Paris, Dorie Weaver (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

More in Pharmacology

All Pharmacology lessons
PharmacologyThrombolytic Drugs: Mechanisms, Uses, and Safety5 flashcards · 5 quiz questions · 4 gamesPlay free →PharmacologyARBs: AT₁ Blockade, Safety, and Nursing Monitoring5 flashcards · 5 quiz questions · 4 gamesPlay free →PharmacologyAntiplatelet Drugs: Aspirin, P2Y12 Inhibitors, and Eptifibatide5 flashcards · 5 quiz questions · 4 gamesPlay free →PharmacologyNitrate Pharmacology: Actions, Uses, Safety, and Client Teaching5 flashcards · 5 quiz questions · 4 gamesPlay free →PharmacologyOral Antidiabetic Drugs: Mechanisms, Safety, and Hypoglycemia Care5 flashcards · 5 quiz questions · 4 gamesPlay free →PharmacologyDrug Disposition, Drug Action, and Factors Shaping Medication Response5 flashcards · 5 quiz questions · 4 gamesPlay free →