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Pharmacological TherapiesRR < 12 → hold opioid

Opioid Analgesics and NaloxoneNCLEX cheat sheet

Opioid analgesics (morphine, hydromorphone, fentanyl, oxycodone, codeine) relieve moderate to severe pain by binding opioid receptors in the central nervous system.

20 key facts 5 practice questions Reviewed Oct 2026
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Meds

  • Morphine, hydromorphone, fentanyl
  • Naloxone = reversal antidote

Signs

  • Resp depression, sedation
  • Pinpoint pupils, ↓ BP, constipation

Do

  • Monitor RR before + after dose
  • Bowel regimen, fall precautions

Report

  • RR < 12 → hold, naloxone ready
  • Naloxone short-acting → re-sedation
Key takeaway

Respiratory depression is the most serious adverse effect and is the priority assessment before and after dosing.

Before you read

Test yourself first: 5 questions

Question 1 of 5

A client is prescribed buprenorphine-naloxone (a combination film) for opioid use disorder. Why is naloxone included in this combination product?

What is opioid analgesics and naloxone?

Their most dangerous adverse effect is respiratory depression. Naloxone (Narcan) is the opioid reversal agent. Memory aid: opioids cause the triad of pinpoint pupils, decreased respirations, and sedation.

Key points to remember

  • Respiratory depression is the most serious adverse effect and is the priority assessment before and after dosing.
  • Classic opioid signs are pinpoint (constricted) pupils, decreased respiratory rate, sedation, and decreased level of consciousness.
  • Constipation is a near-universal side effect that does not improve with tolerance, so a bowel regimen is standard.
  • Other effects include nausea, urinary retention, hypotension, and itching.
  • Naloxone reverses opioid effects but has a shorter duration than many opioids, so repeat dosing and continued monitoring are required.
  • Naloxone can precipitate acute withdrawal and the abrupt return of severe pain in dependent patients.

Signs & symptoms

  • Resp depression, sedation
  • Pinpoint pupils, ↓ BP, constipation

Nursing priorities

  1. Assess respiratory rate, depth, and oxygen saturation before and after administration; hold the dose for a respiratory rate below 12.
  2. Have naloxone and resuscitation equipment readily available.
  3. Use a sedation scale and a pain scale to titrate safely.
  4. Initiate a bowel regimen with stool softeners and stimulants to prevent constipation.
  5. Implement fall precautions and monitor blood pressure and level of consciousness.

Patient teaching

  • Take stool softeners and increase fluids and fiber to prevent constipation.
  • Do not drink alcohol or take other sedatives with opioids.
  • Avoid driving or operating machinery until you know how the medication affects you.

Red flags: report now

  • Respiratory rate below 12, oxygen desaturation, or increasing sedation requires holding the opioid and considering naloxone.
  • Unarousable patient with pinpoint pupils and shallow breathing.
  • After naloxone, watch for re-sedation because the opioid may outlast the antidote.
  • Severe hypotension or loss of airway protection.

References

Clinical references for this topic

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