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.
Comparison
Side-by-side3 compared
Comparevs
Dimension
Opioids
NSAIDs
Acetaminophen
Class & mechanism
- µ-opioid receptor agonist (CNS)
- COX inhibition → ↓ 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 → fatal resp depression
- Avoid in CKD or active ulcer; + anticoag → 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 → ↓ 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 → fatal resp depression
NSAIDs
- Avoid in CKD or active ulcer; + anticoag → 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.
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