Ibuprofen vs Paracetamol: Which Painkiller Is Right for You?

Educational information, not medical advice. See our Medical Disclaimer. Last updated: October 29, 2026.

Ibuprofen and paracetamol sit side by side in almost every medicine cabinet, and they are often treated as interchangeable. They are not. They work in different ways, suit different kinds of pain, and carry different risks. Knowing the difference helps you pick the right one, and avoid the wrong one if you have certain health conditions.

How they differ

Ibuprofen (sold as Advil, Motrin, Nurofen and generics) is a non-steroidal anti-inflammatory drug, or NSAID. It relieves pain, lowers fever and reduces inflammation. Paracetamol (acetaminophen, Tylenol and others) relieves pain and lowers fever but has little anti-inflammatory effect. Because it is not an NSAID, it is gentler on the stomach, but it is processed by the liver, which is why dose limits matter. See our full guide to paracetamol dosage, safety and common mistakes.

Which one for which problem

These are general starting points, not rules. Your own history and other medicines matter more than any table.

Ibuprofen: usual adult dosing

The NHS gives these over-the-counter guidelines for adults, but always follow your product’s leaflet:

• 200 mg tablets or capsules: one or two at a time, up to three times a day if needed, at least four hours apart. No more than six in 24 hours.
• 400 mg tablets or capsules: one at a time, up to three times a day, at least four hours apart. No more than three tablets in 24 hours.
• Gels and sprays: apply to the painful area, up to three or four times a day.
• Take tablets with or after food, and do not use them for more than 10 days unless a doctor advises it.
• Use the smallest dose for the shortest time, because risk rises with higher doses and longer use.

For paracetamol limits, see the paracetamol guide linked above. The limits for each medicine apply separately.

Who should avoid or be careful with each

Ibuprofen: ask a pharmacist or doctor first if you:

• Have or have had a stomach ulcer or stomach bleeding.
• Have asthma or allergies, or have reacted to aspirin or another NSAID.
• Have heart, liver or kidney disease, a clotting problem or have had a stroke.
• Are pregnant, trying to conceive or breastfeeding.
• Have chickenpox.
• Take blood thinners such as warfarin, steroids, some antidepressants or blood pressure medicines.
• Take another NSAID such as naproxen or aspirin. Do not combine NSAIDs.

Paracetamol: ask first if you have liver disease, drink heavily, weigh very little or take other medicines that affect the liver. Be careful not to double up with cold and flu products that already contain paracetamol.

Can you take them together?

Because they work differently and do not directly interact, many pharmacists say that ibuprofen and paracetamol can be taken together or alternated for short periods, as long as each stays within its own dose limits and you are not in a group that should avoid ibuprofen. Check with a pharmacist if you are unsure, especially if you are older, pregnant, or have stomach, kidney, heart or asthma problems. Keep a written note of what you took and when, so you do not lose track.

Warning signs: stop and get medical advice

• Black or bloody stools, vomiting blood, or severe stomach pain after ibuprofen.
• Wheezing, swelling of the face or lips, or a rash, which may signal an allergic reaction. Seek emergency help for severe symptoms.
• Pain that gets worse, or lasts beyond a few days of treatment.
• Fever lasting about three days or more.
• Any suspected overdose of either medicine. Contact emergency services or poison control immediately.

Frequently asked questions

Which works faster?

Both usually start to work within about 30 to 60 minutes when taken by mouth. Individual response varies.

Which is safer for the stomach?

Paracetamol is less likely to irritate the stomach. Taking ibuprofen with or after food can reduce stomach upset.

Which is better for a fever?

Both reduce fever. The choice usually depends on your health conditions, age and what you have at home. For children, use only a children’s product and follow the label and professional advice.

Can I use ibuprofen gel instead of tablets?

Gels deliver less of the drug into the bloodstream and can be useful for localized joint or muscle pain, but the same cautions about allergies and NSAIDs apply. Follow the leaflet.

Sources

• NHS: Ibuprofen for adults
• NHS: How and when to take ibuprofen
• NHS: Paracetamol for adults
• MedlinePlus: Acetaminophen