Pharmacology
Paracetamol vs Ibuprofen — Which Should You Choose?
2025-05-20 Pharmapedia Medical Team 5 min read
Introduction
Paracetamol (acetaminophen) and ibuprofen are two of the most commonly used analgesic and antipyretic medications in Pakistan. While both are available over-the-counter, they have distinct mechanisms of action, safety profiles, and clinical indications that influence which one should be chosen in different clinical scenarios.
Mechanism of Action
**Paracetamol** works primarily through inhibition of cyclooxygenase (COX) enzymes in the central nervous system. It has weak peripheral anti-inflammatory activity and is classified as an analgesic and antipyretic rather than a true anti-inflammatory agent.
**Ibuprofen** is a non-steroidal anti-inflammatory drug (NSAID) that inhibits both COX-1 and COX-2 enzymes peripherally, providing significant anti-inflammatory effects in addition to analgesia and antipyresis.
Clinical Indications
Choose Paracetamol When:
Mild to moderate pain without inflammation (headache, dental pain, myalgia)
Fever reduction in children and adults
Patients with contraindicatins to NSAIDs (history of GI bleeding, peptic ulcer disease, aspirin-sensitive asthma)
Pregnancy — paracetamol is the analgesic of choice during pregnancy
Anticoagulated patients — does not affect platelet function
Children — preferred first-line analgesic/antipyretic in paediatrics
Choose Ibuprofen When:
Pain with an inflammatory component (arthritis, musculoskeletal injuries, dysmenorrhea, dental abscess)
Higher potency analgesia required — ibuprofen 400 mg is equivalent to paracetamol 1000 mg
Inflammatory conditions such as rheumatoid arthritis, gout, or tendinitis
Post-operative pain — particularly where inflammation contributes to pain
Dosing
Paracetamol
Adults: 500-1000 mg every 4-6 hours, maximum 4000 mg/day
Children: 15 mg/kg/dose every 4-6 hours, maximum 60 mg/kg/day
Ibuprofen
Adults: 200-400 mg every 6-8 hours, maximum 1200 mg/day (OTC); up to 3200 mg/day with medical supervision
Children: 5-10 mg/kg/dose every 6-8 hours
Safety Profile
Paracetamol Side Effects
Hepatotoxicity with overdose (>150 mg/kg) — the major concern
Ibuprofen Side Effects
GI effects: dyspepsia, gastritis, peptic ulcer, GI bleeding (risk increases with dose and duration)
Cardiovascular: increased risk of thrombotic events with chronic high-dose use
Renal: acute kidney injury, fluid retention, worsening of CKD
Asthma: may trigger bronchospasm in aspirin-sensitive patients
Anti-platelet effect: reversible inhibition of platelet aggregation
Drug Interactions
Paracetamol Interactions
Warfarin: paracetamol >2 g/day may potentiate anticoagulation (monitor INR)
Alcohol: chronic heavy alcohol use reduces the hepatotoxic threshold
Enzyme inducers (carbamazepine, phenytoin): may increase hepatotoxicity risk
Ibuprofen Interactions
Anticoagulants (warfarin, apixaban): increased bleeding risk
Aspirin: reduced cardioprotection, increased GI toxicity
ACE inhibitors/ARBs: reduced antihypertensive effect, increased renal risk
Diuretics: reduced efficacy, increased nephrotoxicity
Methotrexate: reduced clearance, increased toxicity
Lithium, Digoxin: reduced clearance
Special Populations
Cost Comparison in Pakistan
Key Takeaways
1. **For simple fever and mild pain without inflammation** — paracetamol is the preferred first-line agent
2. **For inflammatory pain** — ibuprofen is more effective
3. **Never exceed the maximum daily dose of either medication**
4. **Avoid combining paracetamol-containing products** (common in cold and flu preparations)
5. **In elderly patients** — consider the higher risk of GI and renal complications with NSAIDs
6. **Alternating paracetamol and ibuprofen** (every 3-4 hours) can be used for fever control in children, though evidence for superiority is limited
**Disclaimer**: This article is for educational purposes only. Always consult a qualified healthcare professional for medical advice tailored to your specific situation.