Paracetamol is good for
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Here is a complete overview of what paracetamol (acetaminophen) is good for, sourced from authoritative medical textbooks:
Paracetamol (Acetaminophen) - Uses & Pharmacology
What It Is Good For
| Indication | Notes |
|---|---|
| Fever (Antipyretic) | Reduces elevated body temperature by acting on the hypothalamic heat-regulating center via CNS prostaglandin inhibition |
| Mild to moderate pain (Analgesic) | Headache, toothache, muscle aches, backache, menstrual cramps, sore throat, post-procedural pain |
| Pain in children with viral illness or chickenpox | The preferred choice over aspirin because aspirin carries a risk of Reye syndrome in this setting |
| Patients with GI risks from NSAIDs | Does NOT cause gastric irritation, ulceration, or GI bleeding, making it safer for patients with peptic ulcer disease or gastritis |
| Patients with bleeding/coagulation disorders | Unlike NSAIDs and aspirin, paracetamol does not inhibit platelet function or prolong bleeding time |
| Pregnancy | It is the first-line analgesic and antipyretic in pregnancy, where NSAIDs (especially in the third trimester) are discouraged |
| Patients who don't need anti-inflammatory action | When inflammation is not the primary issue, paracetamol avoids the side effects of NSAIDs entirely |
| Intravenous (IV) use | Available as Ofirmev (IV formulation) for peri-operative pain and fever management in hospital settings |
| Combination analgesics | Often combined with codeine, tramadol, or caffeine to boost pain relief for moderate-to-severe pain or migraine |
Mechanism of Action
Paracetamol inhibits prostaglandin synthesis in the CNS by acting on the peroxidase function of COX-1 and COX-2 enzymes. However, it is inactivated peripherally, which explains why it:
- ✅ Reduces fever and pain (central action)
- ✅ Does NOT cause GI bleeding (no peripheral COX inhibition)
- ❌ Has little to no anti-inflammatory effect
Metabolism (Therapeutic vs. Toxic Doses)
At therapeutic doses: The toxic intermediate NAPQI is neutralized by hepatic glutathione, forming mercapturic acid (harmless).
At toxic/overdose doses: Glutathione is depleted, NAPQI binds to liver cell proteins, causing hepatic necrosis. The antidote is N-acetylcysteine (NAC).
Key Advantages Over NSAIDs
- No GI ulceration or bleeding
- No platelet dysfunction
- Safe in patients with aspirin-sensitive asthma
- Safe in renal impairment (short-term, low dose)
- First-line in pregnancy and children with viral illness
Recommended Dosing (Adults)
- Oral: 500-1000 mg every 4-6 hours, max 3000-4000 mg/day (lower limit recommended in patients with liver disease, malnutrition, or chronic alcohol use)
- Reduce dose or avoid entirely in severe hepatic impairment
Sources: Lippincott Illustrated Reviews: Pharmacology, p. 1364-1366 | Goodman & Gilman's Pharmacological Basis of Therapeutics | Morgan & Mikhail's Clinical Anesthesiology | Henry's Clinical Diagnosis and Management by Laboratory Methods
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