Paracetamol Tablets — Uses, Dosage for Adults & Children, Mechanism & Safety

Paracetamol (Acetaminophen): Complete Guide

Paracetamol (acetaminophen) is the most widely used analgesic and antipyretic medication globally. Available over-the-counter in virtually every country, it is recommended by the WHO as first-line treatment for pain and fever in both adults and children. This guide covers its mechanism, proper dosing, safety considerations, and available formulations.

Mechanism of Action

Despite being one of the oldest and most commonly used medications, paracetamol’s exact mechanism remains incompletely understood. Current evidence supports multiple pathways including central COX-2 inhibition (selective inhibition of cyclooxygenase in the CNS), serotonergic pathway activation (descending serotonergic pain pathways), endocannabinoid system interaction (AM404 metabolite acts on TRPV1 and CB1 receptors), and nitric oxide pathway modulation.

Unlike NSAIDs, paracetamol has minimal anti-inflammatory activity at therapeutic doses, which explains its favorable gastrointestinal safety profile but limited utility in inflammatory conditions.

Dosage Guidelines

Available Formulations

• Conventional tablets: 500mg, 650mg
• Dispersible tablets: 500mg (dissolve in water — ideal for children and elderly)
• Syrup/Suspension: 120mg/5mL, 250mg/5mL (pediatric)
• Suppositories: 125mg, 250mg, 500mg (for patients who cannot take oral medication)
• IV infusion: 10mg/mL (hospital use)
• Extended-release: 665mg (sustained action)

Paracetamol vs Ibuprofen

Safety — Hepatotoxicity Risk

Paracetamol is the leading cause of acute liver failure in developed countries, almost entirely due to overdose. At therapeutic doses, paracetamol is primarily metabolized by glucuronidation and sulfation. However, a small fraction is converted by CYP2E1 to the toxic metabolite NAPQI (N-acetyl-p-benzoquinone imine), which is normally detoxified by glutathione. In overdose, glutathione stores are depleted, allowing NAPQI to cause hepatocellular necrosis.

Key safety rules: Never exceed 4g/day in healthy adults, reduce to 2-3g/day in patients with liver disease, alcohol use, or malnutrition, and maintain minimum 4-hour intervals between doses.

Paracetamol from Aarise Pharmaceuticals

Aarise Pharmaceuticals manufactures paracetamol in multiple formulations including conventional tablets and dispersible tablets at our WHO-GMP certified facility in Haridwar. Browse our product range or contact us for third-party manufacturing inquiries.