Paracetamol

Paracetamol acts as an analgesic and antipyretic, targeting pain and fever pathways.

• Headache: provides rapid relief of pain associated with tension or vascular headaches.
• Fever: lowers elevated body temperature by acting on the hypothalamic heat‑regulation center.
• Dental pain: reduces discomfort following tooth extraction or dental procedures.
• Musculoskeletal pain: alleviates aches from sprains, strains, or arthritis.
• Cold/flu symptoms: eases general body aches and fever accompanying viral infections.

• Paracetamol inhibits cyclooxygenase (COX) enzymes, primarily COX‑2, within the central nervous system, leading to reduced synthesis of prostaglandins that mediate pain and fever. Its action is largely confined to the brain and spinal cord, with minimal peripheral anti‑inflammatory effect. By lowering prostaglandin levels, the drug raises the pain‑threshold and resets the hypothalamic set‑point for temperature regulation.

Paracetamol is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Nausea: occasional upset stomach or feeling of queasiness.
• Skin rash: mild erythema or itching at the site of contact.
• Sweating: increased perspiration without exertion.
• Dizziness: transient light‑headedness, especially after rapid dose changes.
• Elevated liver enzymes: mild, reversible changes detected in routine labs.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin blistering requiring immediate medical attention.
• Anaphylaxis: rapid onset of breathing difficulty, swelling, and hypotension.
• Hepatotoxicity: potentially fatal liver injury, especially with overdose.
• Blood disorders: rare cases of agranulocytosis or thrombocytopenia.
• Renal impairment: acute kidney injury in susceptible individuals.

Paracetamol should be used with caution in specific populations and clinical situations.

• Dose adjustment: required in patients with hepatic impairment to avoid toxicity.
• Alcohol consumption: limit intake, as combined use increases risk of liver damage.
• Age: use with caution in children under two years; pediatric dosing must be prescribed.
• Concurrent medications: avoid combining with other hepatotoxic drugs without medical guidance.
• Pregnancy and lactation: consult a healthcare professional before use.
• Store at ambient temperature: keep in original container, protect from moisture and direct sunlight.

Paracetamol can interact with several medicines, influencing efficacy or safety.

Major Interactions (Avoid)

• Warfarin: increased anticoagulant effect may lead to bleeding.
• Isoniazid: combined use can potentiate hepatotoxicity.
• High‑dose acetaminophen combinations: risk of cumulative overdose.

Moderate Interactions (Monitor Closely)

• Alcohol: additive liver stress requires monitoring of liver function.
• Carbamazepine: may reduce analgesic effect by increasing metabolism.
• Phenobarbital: may increase drug clearance, lowering therapeutic benefit.