Paracetamol Drug Profile

What is Paracetamol?

Paracetamol, also known as acetaminophen in North America, is a widely used over-the-counter medication belonging to the analgesic (pain reliever) and antipyretic (fever reducer) class of drugs. It is commonly used to treat mild to moderate pain and reduce fever in adults and children. Paracetamol is considered one of the most frequently used medications worldwide and is included on the World Health Organization’s List of Essential Medicines.

Uses

Paracetamol is approved for several common conditions:

• Headache and migraine relief: Effective for tension headaches and mild to moderate migraine episodes
• Fever reduction: Helps lower elevated body temperature in cases of infection or illness
• Musculoskeletal pain: Relieves back pain, muscle aches, and joint discomfort
• Dental pain: Provides relief from toothaches and post-dental procedure discomfort
• Cold and flu symptoms: Reduces aches, pains, and fever associated with respiratory infections

How it works

Paracetamol works primarily by inhibiting cyclooxygenase (COX) enzymes in the central nervous system, which reduces the production of prostaglandins involved in pain and fever signaling. Unlike traditional nonsteroidal anti-inflammatory drugs (NSAIDs), paracetamol has minimal anti-inflammatory effects and does not significantly inhibit COX enzymes in peripheral tissues. The exact mechanism of its pain-relieving effects remains partially understood, but it appears to involve both central and peripheral pathways.

Side effects

Common side effects:

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• Nausea
• Stomach upset
• Skin rash or allergic reactions
• Dizziness
• Drowsiness

Serious side effects to watch for:

• Severe liver damage (hepatotoxicity)
• Severe allergic reactions including difficulty breathing
• Skin reactions such as Stevens-Johnson syndrome
• Blood disorders including low platelet count

Warnings and precautions

• Liver disease: People with existing liver problems should use paracetamol with extreme caution or avoid it entirely, as the medication is primarily metabolized by the liver
• Alcohol consumption: Regular alcohol use increases the risk of liver toxicity when combined with paracetamol
• Pregnancy and breastfeeding: Generally considered safe during pregnancy and breastfeeding when used as directed, but consult healthcare providers before use
• Maximum daily dose: Never exceed 4 grams (4000mg) in 24 hours for adults, as overdose can cause fatal liver damage
• Multiple medications: Check all medications for paracetamol content to avoid accidental overdose from combination products

Interactions

• Warfarin: May increase bleeding risk by enhancing anticoagulant effects
• Alcohol: Chronic alcohol use increases risk of liver toxicity
• Carbamazepine: May increase paracetamol metabolism, potentially reducing effectiveness
• Isoniazid: Increases risk of liver toxicity when used together
• Phenytoin: May increase paracetamol clearance and reduce pain relief
• Metoclopramide: May increase paracetamol absorption and effects
• Probenecid: Can increase paracetamol levels in the blood
• St. John’s Wort: May reduce paracetamol effectiveness by increasing metabolism

Check interactions with the GMJ Interaction Checker

Dosage

For adults, the typical dosage is 500mg to 1000mg every 4-6 hours as needed, not exceeding 4000mg (4 grams) in 24 hours. For children, dosing is based on weight and age, typically 10-15mg per kilogram of body weight every 4-6 hours. Extended-release formulations may be taken every 8 hours. Always follow package instructions or healthcare provider recommendations, and use the lowest effective dose for the shortest duration necessary. Dosage should always be determined by a healthcare provider, especially for children, elderly patients, or those with underlying health conditions.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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