Paracetamol Ab (Paracetamol)

Paracetamol Ab is an analgesic and antipyretic used in the management of several clinical conditions:

• Post‑operative pain: provides effective relief of moderate pain following surgery.
• Acute febrile states: reduces fever associated with infections or inflammatory processes.
• Severe headache or migraine: helps lower pain intensity when oral analgesics are unsuitable.
• Musculoskeletal pain: alleviates pain from strains, sprains and other musculoskeletal injuries.
• Cancer‑related pain: used as part of multimodal analgesia for breakthrough pain in oncology patients.
• Pediatric fever: safe for reducing fever in children when oral routes are unavailable.

• Paracetamol exerts its analgesic and antipyretic actions primarily by inhibiting central cyclooxygenase enzymes (COX‑1 and COX‑2) and reducing prostaglandin synthesis in the brain. This modulation of the prostaglandin pathway lowers the hypothalamic set‑point for temperature regulation and diminishes pain signal transmission in the central nervous system.

Paracetamol Ab may cause a range of adverse reactions, most of which are dose‑dependent and reversible.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Local irritation: pain or redness at the intravenous site.
• Transient elevation of liver enzymes: mild increase in ALT/AST.
• Headache: occasional mild headache.
• Dizziness: brief sensation of light‑headedness.

Serious or Rare Side Effects

• Anaphylactic reaction: severe allergy with rash, swelling, or breathing difficulty.
• Stevens‑Johnson syndrome: rare skin blistering disorder.
• Hepatotoxicity: significant liver injury, especially with overdose.
• Blood dyscrasias: rare cases of thrombocytopenia or neutropenia.
• Renal impairment: acute kidney injury in susceptible patients.
• Hypotension: sudden drop in blood pressure during rapid infusion.

Paracetamol Ab should be used with careful clinical assessment and monitoring.

• Dose adjustment: reduce dose in patients with hepatic impairment.
• Renal monitoring: assess kidney function in patients with pre‑existing renal disease.
• Allergy screening: avoid use in individuals with known hypersensitivity to paracetamol.
• Concomitant hepatotoxins: avoid combining with other hepatotoxic drugs.
• Infusion rate: administer slowly to minimise local irritation and hypotension.
• Store at ambient temperature: keep in original container, protect from moisture and direct sunlight.

Paracetamol Ab can interact with several medicines, altering efficacy or safety.

Major Interactions (Avoid)

• Warfarin: increased anticoagulant effect, raising bleeding risk.
• Isoniazid: heightened risk of liver toxicity.
• Highly active antiretroviral therapy (HAART): potential for increased hepatotoxicity.

Moderate Interactions (Monitor Closely)

• CYP450 inducers (e.g., rifampicin, carbamazepine): may reduce paracetamol plasma levels.
• Alcohol: additive hepatic stress.
• Loop diuretics: may exacerbate renal effects when combined with high‑dose paracetamol.
• Oral contraceptives: may slightly increase paracetamol clearance.
• NSAIDs: concurrent use can increase risk of gastrointestinal irritation.