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Medications to Treat Musculoskeletal Pain | 마이메르시 MyMerci
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Medications to Treat Musculoskeletal Pain

NCLEX Review Guide: Pharmacology - Musculoskeletal Pain Medications

Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)

Common NSAIDs and Mechanisms

  • Ibuprofen (Advil, Motrin) - Inhibits COX-1 and COX-2 enzymes, reducing prostaglandin synthesis and providing anti-inflammatory, analgesic, and antipyretic effects.
  • Naproxen (Aleve) - Longer half-life than ibuprofen, allowing for twice-daily dosing with sustained anti-inflammatory action.
  • Celecoxib (Celebrex) - Selective COX-2 inhibitor with reduced GI side effects but increased cardiovascular risk.
Clinical Alert: NSAIDs increase risk of GI bleeding, especially in elderly patients or those with history of peptic ulcer disease.

Memory Aid: NSAID Side Effects

"GI RENAL HEART"

  • GI bleeding/ulceration
  • Renal dysfunction
  • Heart problems (increased CV risk)

Key Points

  • Monitor for signs of GI bleeding: black tarry stools, coffee-ground emesis
  • Assess renal function before and during therapy
  • Take with food to minimize GI irritation

Opioid Analgesics

Opioid Classifications and Uses

  • Morphine - Gold standard opioid for severe pain, binds to mu-opioid receptors in CNS to alter pain perception and emotional response.
  • Oxycodone - Oral opioid with high bioavailability, often combined with acetaminophen for moderate to severe pain management.
  • Fentanyl - Highly potent synthetic opioid, 50-100 times stronger than morphine, available in transdermal patches for chronic pain.

Clinical Scenario

A post-operative orthopedic patient receiving morphine PCA reports respiratory rate of 8 breaths/minute and appears drowsy. What is your priority action?

Answer: Immediately assess consciousness level, prepare naloxone (Narcan), and notify physician - this indicates respiratory depression.

    Opioid Administration Protocol

  1. Assess pain level using 0-10 scale
  2. Check respiratory rate, oxygen saturation, and level of consciousness
  3. Administer medication as prescribed
  4. Monitor for effectiveness and adverse effects every 15-30 minutes initially
  5. Document response and any side effects

Key Points

  • Respiratory depression is the most serious adverse effect
  • Naloxone (Narcan) is the antidote for opioid overdose
  • Monitor for constipation - preventive measures needed

Muscle Relaxants

Centrally Acting Muscle Relaxants

  • Cyclobenzaprine (Flexeril) - Reduces muscle spasm through central action, structurally similar to tricyclic antidepressants with anticholinergic effects.
  • Baclofen (Lioresal) - GABA agonist that inhibits spinal reflexes, particularly effective for spasticity from spinal cord injuries.
  • Carisoprodol (Soma) - Metabolized to meprobamate, has potential for abuse and dependence with sedative effects.
Clinical Alert: Muscle relaxants cause significant drowsiness and dizziness - assess fall risk and implement safety precautions.

Key Points

  • Avoid alcohol and other CNS depressants
  • Do not discontinue abruptly - taper gradually
  • Monitor for anticholinergic effects: dry mouth, urinary retention, constipation

Commonly Confused Concepts

Medication Type Primary Action Main Side Effect Monitoring Priority
NSAIDs Anti-inflammatory GI bleeding Renal function
Opioids Pain perception Respiratory depression Respiratory rate
Muscle Relaxants Muscle spasm Sedation Fall risk

Quick Differentiation

Pain + Inflammation = NSAIDs

Severe Pain = Opioids

Muscle Spasm = Muscle Relaxants

Study Tips and Memory Aids

NCLEX Success Strategy

  • Safety First: Always prioritize respiratory assessment with opioids
  • GI Protection: NSAIDs with food, monitor for bleeding
  • Fall Prevention: Muscle relaxants require safety precautions

Common Pitfalls to Avoid

  • Don't confuse COX-1 and COX-2 selectivity effects
  • Remember: Elderly patients need lower doses due to decreased metabolism
  • Combination medications (e.g., Percocet) have dual toxicity risks

Quick Check Questions

Can you identify the antidote for opioid overdose?
Do you know the main contraindication for NSAIDs?
Can you list three safety measures for muscle relaxants?

Remember: You've got this! Focus on patient safety, understand the "why" behind each intervention, and trust your nursing judgment. Every question you study brings you closer to becoming the nurse you're meant to be!

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