What is the appropriate pain management plan for a generally healthy 16‑year‑old (≈50–70 kg) with no liver, kidney, gastrointestinal disease or drug allergies?

Pain Management for a 16-Year-Old

For a healthy 16-year-old with acute pain, start with NSAIDs (such as ibuprofen 400-600 mg every 6-8 hours) or acetaminophen (paracetamol 500-1000 mg every 4-6 hours, maximum 4000 mg/day) as first-line therapy, escalating to opioids only if pain is moderate to severe and non-opioid analgesics are insufficient. 1, 2

Stepwise Approach Based on Pain Severity

Mild Pain (WHO Level I)

• Acetaminophen/paracetamol: 500-1000 mg every 4-6 hours (maximum 4-6 grams/24 hours) 3
• NSAIDs as first-line: High-certainty evidence shows NSAIDs reduce pain by 1.29 cm on a 10 cm visual analog scale compared to placebo, with a 16% greater likelihood of achieving clinically meaningful pain reduction 1
  • Ibuprofen: 400-600 mg every 6-8 hours (maximum 2400 mg/day) 3
  • Naproxen: 250-500 mg twice daily 3
• Combination therapy: NSAIDs and acetaminophen can be used together for additive effect 3

Moderate Pain (WHO Level II)

If non-opioid analgesics are insufficient after appropriate dosing:

• Continue NSAIDs and/or acetaminophen as baseline 3
• Add low-dose opioids if needed:
  • Tramadol: Starting dose appropriate for adolescents, though caution is warranted due to potential for dizziness, nausea, and serotonin effects 3
  • Avoid codeine entirely: Codeine is contraindicated in patients under 18 years, particularly after tonsillectomy/adenoidectomy, due to variable metabolism via CYP2D6 that can lead to ineffective analgesia in poor metabolizers or toxicity in ultrarapid metabolizers 3, 2
  • Avoid tramadol if under 12 years: Similar CYP2D6-related concerns and risk of serotonin toxicity 2

Severe Pain (WHO Level III)

For severe acute pain requiring opioids:

• Oral morphine is the standard first-choice opioid: 5-15 mg immediate-release formulation for opioid-naïve patients 3
• Oxycodone: Alternative option, approximately 1.5-2 times more potent than oral morphine 3
• Hydromorphone: Another alternative, approximately 7.5 times more potent than oral morphine 3
• Oral route preferred: Always use oral administration when feasible 3
• Immediate-release formulations only: Never use extended-release or transdermal formulations (like fentanyl patches) for acute pain or in opioid-naïve patients 3

Critical Prescribing Principles for Adolescents

Opioid Prescribing When Necessary

• Limit initial supply to ≤5 days unless pain is from trauma/surgery expected to last longer 2
• Use immediate-release formulations only 2
• Start with lowest age- and weight-appropriate doses 2
• Never prescribe opioids as monotherapy: Always combine with non-opioid analgesics 2
• Provide rescue doses: Approximately 10% of total daily dose for breakthrough pain 3

Absolute Contraindications in This Age Group

• No codeine for any patient under 18 years 2
• No tramadol for patients under 12 years 2
• No extended-release or long-acting opioid formulations for acute pain 2

Safety Measures

Monitoring and Education

• Assess pain regularly using validated scales (visual analog scale, numerical rating scale, or verbal rating scale) 3
• Provide naloxone and education on its use to all patients receiving opioid prescriptions 2
• Educate on safe storage and disposal: Direct observation of medication administration when possible, with a plan for safe disposal of unused medications 2
• Monitor for adverse effects: Particularly constipation with opioids (prophylactic laxatives recommended), nausea/vomiting (treat with metoclopramide or antidopaminergics), and sedation 3

NSAID Safety Considerations

• Short-term use is safe: High-certainty evidence shows NSAIDs do not increase risk of gastrointestinal adverse events in short-term use for acute pain 1
• Monitor if prolonged use: Gastrointestinal bleeding, renal dysfunction, and cardiovascular effects are concerns only with extended use 3
• No gastroprotection needed for short-term acute pain management in healthy adolescents 1

Multimodal Approach

Always incorporate non-pharmacologic strategies alongside medications 2, 4:

• Distraction techniques
• Cold/heat application when appropriate
• Positioning and immobilization for injuries
• Psychological support to reduce anxiety

Common Pitfalls to Avoid

1. Undertreating pain due to opioid concerns: When opioids are indicated for severe pain, prescribe them appropriately rather than allowing suffering 4, 5
2. Using codeine or tramadol in adolescents: These have unpredictable efficacy and safety profiles in this age group 3, 2
3. Starting with extended-release formulations: Always use immediate-release for acute pain 2
4. Prescribing opioids alone: Always combine with non-opioid analgesics for multimodal analgesia 2
5. Excessive initial opioid quantities: Limit to 5 days or less for most acute conditions 2
6. Forgetting constipation prophylaxis: Laxatives must be prescribed routinely with opioids 3