Painkiller Safety: How to Use Paracetamol, Ibuprofen and Aspirin Wisely

• 7th November 2025

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Painkillers such as paracetamol, ibuprofen, and aspirin can help relieve short-term pain, but they work in different ways and are not suitable in every situation. Knowing which painkiller to choose, how much to take, and when to avoid certain medicines helps prevent side effects and supports safer pain management. If pain is severe, persistent, or recurring, it is best to consult a pharmacist or GP for further advice.

1. What Do We Mean by Painkiller Safety?
2. Overview of Common Painkillers
3. Choosing the Right Painkiller for Common Situations
4. Strongest Over the Counter Painkiller
5. Can You Combine Paracetamol and Ibuprofen?
6. When Not to Use Painkillers

Key Takeaways:

• Follow the instructions on the label and avoid taking multiple medicines that contain the same ingredient.
• Paracetamol and ibuprofen are generally appropriate first choices for most short-term pain.
• Aspirin is less commonly recommended for pain, and some people should avoid it.

What Do We Mean by Painkiller Safety?

Painkiller safety means using medicines like paracetamol, ibuprofen, and aspirin in the right dose, at the right time, and for the right reason. It includes keeping to safe daily limits, being aware of possible interactions or health conditions that may make a medicine unsuitable, and avoiding the mistake of taking two products that contain the same ingredient.

Overview of Common Painkillers

The medicines listed below are widely available and can be beneficial when used correctly, but each works differently and comes with its own specific cautions. Choosing the right option depends on the type of pain and your personal health circumstances.

Medicine	What it does	Good for	Avoid / caution	Notes
Paracetamol	Reduces pain and fever	Headache, toothache, back pain, cold and flu symptoms	Liver disease, alcohol dependence	Generally considered a safe first choice when used as directed
Ibuprofen (NSAID)	Reduces inflammation and pain	Muscle pain, sprains, back pain, arthritis	Stomach ulcers, kidney issues, pregnancy	Best taken with food to reduce stomach irritation
Aspirin	Relieves pain and reduces blood clotting	Occasional short-term pain (but not usually first choice)	Under 16s, history of bleeding, stomach problems	Often used at low doses for heart conditions, which is different from pain relief dosing

Related Read: The impact of diet on medication efficacy

“Even everyday painkillers are not one-size-fits-all. The safest choice depends on your health history, any other medicines you’re taking, and the type of pain you’re trying to manage. If you’re unsure which option is right for you, a pharmacist can help you choose safely.”

Adeem Azhar: Co-founder and Chief Executive Officer of Core Prescribing Solutions

Choosing the Right Painkiller for Common Situations

1) The best painkiller for a toothache

Paracetamol or ibuprofen are usually recommended for short-term toothache. These can help reduce pain, but they do not treat the underlying cause. Toothache almost always needs dental assessment, so it is important to contact a dentist as soon as possible rather than relying on painkillers long term.

2) The best painkiller for headaches

Paracetamol is usually the first choice for most headaches. It is well tolerated and effective when taken at the correct dose. Avoid frequent or repeated dosing to prevent medication-overuse headaches. Hydration, rest, and identifying triggers may also help.

3) The best painkiller for back pain

Ibuprofen can be helpful for back pain because it reduces inflammation as well as pain. If ibuprofen is not suitable, paracetamol may be used instead. If back pain is severe, ongoing, or affects movement, a review with a GP or physiotherapist may be helpful.

4) What is a good painkiller for nerve pain?

Standard over-the-counter painkillers are often less effective for nerve pain. A GP may prescribe medicines such as amitriptyline, gabapentin, or duloxetine if nerve pain is suspected. If pain feels burning, shooting, tingling, or electric-like, it is best to speak to a clinician for assessment and tailored management.

Strongest Over the Counter Painkiller

In the UK, the strongest pain relief available without a prescription includes combinations such as paracetamol with ibuprofen or medicines that contain codeine, for example co-codamol. Codeine-containing painkillers should only be used for short periods because they can cause dependence and side effects if taken regularly. If pain is severe, ongoing, or repeatedly returns, it is safer to speak with a pharmacist or GP to review the cause rather than increasing strength or frequency of painkillers.

Related Read: How to manage allergies with over-the-counter medicines

Can You Combine Paracetamol and Ibuprofen?

Yes, paracetamol and ibuprofen can be taken together safely when used at the recommended doses, because they work in different ways. The key is to follow the dosing instructions on each medicine and avoid taking multiple products that contain the same ingredient. A simple approach is to take one medicine, then take the other later if needed, keeping to the usual spacing between doses. If you are unsure, a pharmacist can advise on the safest timing based on your situation.

When Not to Use Painkillers

Some medicines are not suitable for everyone. It is essential to check whether a painkiller is safe for your health situation before taking it.

• Liver conditions or heavy alcohol use: avoid or limit paracetamol.
• Stomach ulcers, heartburn or kidney problems: avoid ibuprofen and aspirin.
• Under 16 years old: do not give aspirin.
• Pregnancy: check with a midwife or GP before taking ibuprofen.
• Pain lasting more than a few days: seek medical advice rather than continuing over-the-counter medicines.

How Core Prescribing Solutions Can Help

Core Prescribing Solutions supports safe and effective use of medicines across primary care. Our clinical pharmacists provide medicines safety education, help develop clear patient-facing information, and work with practices and PCNs to deliver pharmacist-led medicines optimisation and review.

The focus is always on improving patient understanding, reducing avoidable harm, and supporting consistent, high-quality care across the network.

Frequently Asked Questions