multi class comparison

Pain Ladder Decision: Opioid vs NSAID vs Acetaminophen — When to Use Which

Choosing the wrong analgesic class wastes time and risks organ damage — acetaminophen won't touch severe post-op pain, and defaulting to morphine for a mild headache exposes the client to respiratory depression. NCLEX questions test whether you match pain severity to the right drug class and monitor the right organ.

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Comparison

Side-by-side3 compared
Comparevs
Dimension
Opioids
NSAIDs
Acetaminophen
Class & mechanism
  • µ-opioid receptor agonist (CNS)
  • COX inhibition then ↓ prostaglandins
  • Central analgesic/antipyretic
  • no anti-inflammatory
Indications
  • Moderate–severe, acute, cancer pain
  • Mild–moderate pain with inflammation
  • Fever
  • mild–moderate non-inflammatory pain
Route
  • PO (and other routes)
  • PO (and other routes)
  • PO (and other routes)
Key assessment
  • Assess pain — location, intensity, quality
  • Respiratory rate & sedation level
  • Assess pain — location, intensity, quality
  • GI distress, edema, renal function
  • Assess pain — location, intensity, quality
  • Total daily dose from all sources
Monitoring
  • Bowel function (constipation)
  • BUN/creatinine, CBC for GI bleed
  • LFTs with chronic use or overdose
Adverse effects
  • ★Resp depression, sedation, constipation
  • ★GI bleed/ulcers
  • renal injury
  • Few at therapeutic dose
Black box / antidote
  • ★Antidote = naloxone (Narcan)
  • ↑ CV/thrombotic & GI-bleed risk (black box)
  • ★Max 4 g/day
  • hepatotoxic in overdose — NAC
Contraindications & interactions
  • + benzodiazepines then fatal resp depression
  • Avoid in CKD or active ulcer
  • + anticoag then bleed
  • Caution with alcohol or liver disease
Patient teaching
  • Prevent constipation
  • safe storage
  • Do not combine with alcohol/sedatives
  • Take with food or milk
  • Report black/tarry stools
  • Check combination products for hidden acetaminophen
  • Do not exceed 4 g/day
Class & mechanism

Opioids

  • µ-opioid receptor agonist (CNS)

NSAIDs

  • COX inhibition then ↓ prostaglandins
Indications

Opioids

  • Moderate–severe, acute, cancer pain

NSAIDs

  • Mild–moderate pain with inflammation
Route

Opioids

  • PO (and other routes)

NSAIDs

  • PO (and other routes)
Key assessment

Opioids

  • Assess pain — location, intensity, quality
  • Respiratory rate & sedation level

NSAIDs

  • Assess pain — location, intensity, quality
  • GI distress, edema, renal function
Monitoring

Opioids

  • Bowel function (constipation)

NSAIDs

  • BUN/creatinine, CBC for GI bleed
Adverse effects

Opioids

  • ★Resp depression, sedation, constipation

NSAIDs

  • ★GI bleed/ulcers
  • renal injury
Black box / antidote

Opioids

  • ★Antidote = naloxone (Narcan)

NSAIDs

  • ↑ CV/thrombotic & GI-bleed risk (black box)
Contraindications & interactions

Opioids

  • + benzodiazepines then fatal resp depression

NSAIDs

  • Avoid in CKD or active ulcer
  • + anticoag then bleed
Patient teaching

Opioids

  • Prevent constipation
  • safe storage
  • Do not combine with alcohol/sedatives

NSAIDs

  • Take with food or milk
  • Report black/tarry stools

★ marks the fact that sets a column apart.

Clinical Pearl

Liver cap = acetaminophen, GI bleed + kidneys = NSAIDs, count respirations = opioids — the toxicity tells you which drug.

Component Topics

AcetaminophenNSAIDsOpioid Analgesics

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