What does ibuprofen 400 mg treat?
Ibuprofen 400 mg is a non-steroidal anti-inflammatory drug (NSAID) with several important properties, including:
- 💊 Pain relief — headaches, toothache, muscle pain, back pain
- 🔥 Anti-inflammatory action — arthritis, gout, tendon inflammation, sports injuries
- 🌡️ Fever reduction — fever from colds, flu or general infection
- 🩸 Menstrual cramps — reduces the uterine contractions that cause the pain
- 🧠 Migraine — a first-choice option for mild to moderate migraine, working best when taken early
- 🦷 Pain after surgery or dental work — manages both the pain and the swelling after the procedure
Why Is Ibuprofen So Widely Used?
So, what does ibuprofen treat? Ibuprofen is one of the most widely used pain relievers and anti-inflammatory drugs in the world. The World Health Organization (WHO) lists it on its Essential Medicines List because it is highly effective, safe when used correctly, and easy to access.
What sets ibuprofen apart from ordinary painkillers is that it does not just "relieve pain" — it also addresses the underlying inflammation. That makes it well suited to pain that comes with inflammation, something a plain painkiller like paracetamol cannot do.
💡 Want to know how ibuprofen differs from paracetamol? Read more at 👉 [Ibuprofen vs Paracetamol: What's the Difference?]
The 3 Main Properties of Ibuprofen
Ibuprofen belongs to the NSAID (Non-Steroidal Anti-Inflammatory Drug) class. It works by inhibiting the COX-1 and COX-2 enzymes, which are key drivers in producing prostaglandins — the substances responsible for pain, inflammation and fever in the body.
When prostaglandin production drops, the body responds in three main ways:
1. Pain relief (Analgesic)
Ibuprofen effectively relieves mild to moderate pain, whether it is a headache, toothache, muscle pain or back pain, typically starting to work within 20–30 minutes of taking it.
2. Anti-inflammatory action
This is what sets ibuprofen apart from ordinary painkillers — it can directly reduce the swelling, redness and heat caused by inflammation, making it well suited to conditions where inflammation is involved, such as arthritis, tendon inflammation or sports injuries.
3. Fever reduction (Antipyretic)
Ibuprofen lowers fever quickly and effectively by inhibiting prostaglandin production in the part of the brain that controls body temperature (the hypothalamus), bringing body temperature back down to normal.
What Conditions Does Ibuprofen Treat?
Many people know ibuprofen simply as a "headache pill," but it actually treats a much wider range of conditions than most realise:
| Symptom group | Conditions it treats |
|---|---|
| General pain | Headache, toothache, muscle pain, back pain, post-surgical pain |
| Specific pain | Menstrual cramps, migraine, acute gout pain |
| Inflammation | Knee osteoarthritis, rheumatoid arthritis, tendon inflammation, sports injuries |
| Fever | Fever from colds, flu, infections |
Lesser-Known Uses of Ibuprofen
Beyond the headaches and toothaches everyone associates it with, ibuprofen 400 mg has several other properties worth knowing about:
Menstrual cramps (Dysmenorrhea)
Ibuprofen is one of the first-choice medicines doctors recommend for menstrual cramps, because it does not just ease the pain — it also reduces uterine contractions, the main cause of the pain itself. Research from a Cochrane Review found ibuprofen significantly more effective than a placebo at relieving menstrual pain, and it can also help reduce menstrual blood loss.
Migraine
For mild to moderate migraine, ibuprofen 400 mg is a first-choice treatment recommended by the American Headache Society. It works best when taken as soon as symptoms start, since it helps block the nerve inflammation process that triggers migraine.
Acute gout flares
When gout flares up, the joint becomes swollen, red, hot and severely painful. Ibuprofen helps with both the pain and the inflammation at the same time — the American College of Rheumatology recommends NSAIDs, including ibuprofen, as one of the first-choice treatments for an acute gout flare.
Sports injuries
Whether it is a sprain, tendon inflammation or a muscle tear, ibuprofen reduces both pain and swelling, helping recovery along. It is widely used by athletes and runners.
Pain after surgery or dental work
Ibuprofen is often used as a painkiller after minor surgery or tooth extraction, since it manages both the pain and the swelling that follow the procedure. Several studies have found ibuprofen 400 mg to be as effective as, or more effective than, other pain relievers for managing pain after wisdom tooth extraction.
Chronic joint inflammation (Osteoarthritis & Rheumatoid Arthritis)
For people with osteoarthritis or rheumatoid arthritis, ibuprofen helps relieve pain and reduce joint stiffness, making movement easier. It is often used as a first-choice option before considering stronger medicines.
When Should You Choose Ibuprofen Over Other Painkillers?
A simple rule of thumb:
- Plain pain with no inflammation (such as a mild headache) → paracetamol is enough
- Pain together with inflammation (such as swelling, redness or heat) → ibuprofen is the better choice, since it manages both the pain and the inflammation
- Menstrual cramps or migraine → ibuprofen tends to work better, since it addresses the underlying cause
| Situation | Recommended medicine | Why |
|---|---|---|
| Mild headache, no inflammation | Paracetamol | Sufficient, fewer side effects |
| Toothache / pain after extraction | Ibuprofen | Reduces pain + swelling |
| Menstrual cramps | Ibuprofen | Reduces uterine contractions |
| Mild-to-moderate migraine | Ibuprofen | Blocks nerve inflammation |
| Acute gout flare | Ibuprofen | Reduces pain + joint inflammation |
| Sports injury | Ibuprofen | Reduces swelling + speeds recovery |
📖 Want a detailed comparison? Read more at 👉 [Ibuprofen vs Paracetamol: What's the Difference? Which Should You Choose]
📚 More articles about ibuprofen
- 👉 [What Is Ibuprofen? Uses, How to Take It and Precautions — Everything in One Place]
- 👉 [How to Take Ibuprofen 400 mg Correctly and Safely]
- 👉 [How Long Does Ibuprofen Last? When Can You Take It Again?]
- 👉 [Ibuprofen vs Paracetamol: What's the Difference? Which Should You Choose]
- 👉 [Who Should Not Take Ibuprofen? Side Effects and Precautions to Know]
Frequently Asked Questions
Taking ibuprofen on an empty stomach is not recommended, because NSAIDs including ibuprofen can easily irritate the stomach lining. It is best taken with or right after food to lower the risk of stomach pain or ulcers. If stomach pain continues after taking it, ask a pharmacist or doctor.
Yes, they can be taken together, since ibuprofen and paracetamol work through different mechanisms and do not interact with each other. Doctors often have patients alternate or combine them for more severe pain. Follow the dosing interval on each label and stay within the daily maximum for each drug — ask a pharmacist if you are unsure of the right amount.
Ibuprofen starts working within 20–30 minutes of taking it, and its pain-relieving effect lasts around 4–6 hours. It can be taken again every 6–8 hours as labelled, up to 3–4 times a day. If the pain does not ease at the recommended dose, ask a pharmacist.
People with stomach ulcers, chronic kidney disease, cardiovascular disease, or who are in the final trimester of pregnancy should avoid ibuprofen, or use it only under a doctor's guidance — the same applies to anyone with a known allergy to NSAIDs. If you are unsure whether you fall into a risk group, ask a pharmacist before use.
Ibuprofen has paediatric formulations and can be used from around 6 months of age based on body weight, but the dose must be calculated carefully by weight and only a product labelled for children should be used — never give a child an adult formulation on your own. Always ask a pharmacist or doctor before giving a child this medicine.
For everyday pain, ibuprofen should not be taken for more than 3–5 consecutive days without checking with a doctor, since prolonged use raises the risk to the stomach and kidneys. If the pain or inflammation has not improved by then, ask a pharmacist or doctor to look into the underlying cause.
Ibuprofen does not typically cause drowsiness, so driving or work that needs concentration is generally fine. Some people can experience dizziness as a side effect, though — if you feel dizzy after taking it, avoid driving until the feeling passes.
Drinking alcohol while taking ibuprofen is not recommended, since both can irritate the stomach lining, and combining them raises the risk of irritation and stomach bleeding. Leave as much time as possible between the two, and ask a pharmacist if you drink regularly.
⚠️ Disclaimer
The information on this page is for general informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment from a qualified doctor or pharmacist. If you have any questions about your symptoms or medication, always consult a doctor or pharmacist first.
References
- WHO Model List of Essential Medicines — World Health Organization
- Ibuprofen: A Pharmacological Review — StatPearls, National Library of Medicine
- NSAIDs for Dysmenorrhoea (Cochrane Review) — Cochrane Database of Systematic Reviews
- Period pain — NHS
- Acute Treatment of Migraine in Adults — American Headache Society
- 2020 American College of Rheumatology Guideline for Management of Gout — American College of Rheumatology
- Ibuprofen for Acute Postoperative Pain — Cochrane Database of Systematic Reviews
- Ibuprofen — MedlinePlus Drug Information
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