Paracetamol (acetaminophen) and ibuprofen are the two most commonly used over-the-counter painkillers worldwide. While both reduce pain and fever, they work differently and carry different risks. Understanding these differences helps you choose the right one for your situation.

Paracetamol works primarily in the central nervous system. Its exact mechanism isn't fully understood, but it's believed to inhibit COX enzymes in the brain, reducing pain perception and fever. It has no significant anti-inflammatory effect.

Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID). It blocks COX-1 and COX-2 enzymes throughout the body, reducing inflammation, pain, and fever. Its anti-inflammatory action makes it particularly useful for conditions involving swelling.

Paracetamol:

- Adult dose: 500-1000mg every 4-6 hours

- Maximum daily dose: 4000mg (4g)

- Can be taken on an empty stomach

Ibuprofen:

- Adult dose: 200-400mg every 4-6 hours

- Maximum daily dose: 1200mg (OTC) or 2400mg (prescription)

- Best taken with food to protect the stomach

- Headaches and mild pain without inflammation

- Fever reduction (especially in children — it's the first-line choice)

- If you have stomach problems, ulcers, or take blood thinners

- During pregnancy (generally considered safer, but consult your doctor)

- When you need to take pain relief on an empty stomach

- Pain with inflammation: muscle strains, sprains, arthritis

- Dental pain (anti-inflammatory effect is beneficial)

- Menstrual cramps (reduces both pain and prostaglandin-driven inflammation)

- Sports injuries with swelling

- When paracetamol alone isn't providing enough relief

Paracetamol's main risk: liver damage. Exceeding 4g/day or combining with alcohol can cause severe liver injury. Paracetamol overdose is one of the leading causes of acute liver failure. Always check if other medications you're taking contain paracetamol (many cold/flu products do).

Ibuprofen's main risk: stomach and kidneys. NSAIDs can irritate the stomach lining, causing ulcers and bleeding. They can also affect kidney function, especially in dehydrated patients or those with existing kidney issues. Long-term use increases cardiovascular risk.

Yes — paracetamol and ibuprofen can be taken together or alternated, because they work through different mechanisms. This is a common strategy when one alone isn't sufficient. However:

- Don't exceed maximum doses of either drug

- Alternating every 3-4 hours can provide more consistent relief

- Always consult a pharmacist or doctor before combining for children

- Don't combine ibuprofen with other NSAIDs (aspirin, naproxen)

Anti-inflammatory: Paracetamol — No | Ibuprofen — Yes

Empty stomach OK: Paracetamol — Yes | Ibuprofen — No

Pregnancy safe: Paracetamol — Generally yes | Ibuprofen — Avoid in 3rd trimester

Main organ risk: Paracetamol — Liver | Ibuprofen — Stomach/Kidneys

Alcohol interaction: Paracetamol — High risk | Ibuprofen — Moderate risk