Ibuprofen (Nurofen® and Other Brands) – Patient Guide (UK)

Ibuprofen is a widely used medicine for pain, inflammation and fever. In the UK it’s available in various strengths and formulations, including tablets, capsules, oral liquids and effervescent preparations. This guide explains how ibuprofen works, when it’s typically used, how to take it safely, and what to consider regarding food, alcohol and other medicines.

Always follow the instructions on the pack and the advice of a healthcare professional if you’re unsure. If your symptoms do not improve, or you experience severe symptoms, seek medical help promptly.

Basic product information

• Active ingredient: Ibuprofen
• Common uses: Pain relief (e.g., headache, toothache, period pain, muscle pain), fever reduction, and relief of inflammation
• How it comes: Tablets/capsules, oral suspension, effervescent granules/tablets (availability varies by brand)
• Legal status in the UK: Many ibuprofen products are sold as general sale (e.g., pharmacies/supermarkets), while higher strengths may have restrictions depending on product
• Typical strength (examples): 200 mg, 300 mg, 400 mg (varies by product)

Important: Different brands and formulations may have different strength per tablet/5 mL. Check your product label carefully before dosing.

How ibuprofen works (mechanism of action)

Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID). It works by reducing substances in the body called prostaglandins. Prostaglandins contribute to:

• Pain (by sensitising nerves)
• Inflammation (by increasing swelling and tissue irritation)
• Fever (by raising the body’s temperature set point)

By lowering prostaglandin production, ibuprofen can relieve pain and reduce fever and inflammation.

Pharmacokinetics (what the body does to ibuprofen)

“Pharmacokinetics” describes how ibuprofen is absorbed, processed and eliminated. The exact timing can vary by formulation and whether it’s taken with food.

Typical uses and indications

Ibuprofen is commonly used for:

• Fever and feverishness
• Pain such as:
  • Headache
  • Toothache (for short-term relief)
  • Back pain and muscle aches
  • Sprains and strains
  • Period pain (dysmenorrhoea)
  • Joint pain and minor inflammatory aches
  • Cold/flu-related aches (symptom relief)
• Inflammation associated with minor injuries or painful inflammatory conditions

If you have ongoing pain, frequent need for painkillers, or symptoms that worsen or persist, consider speaking to a pharmacist or healthcare professional.

When and how to take ibuprofen (timing)

Timing depends on the product, the strength, and the age of the person taking it. For most over-the-counter ibuprofen regimens, doses are separated by several hours to maintain symptom control.

• Typical adult dosing interval: often every 4 to 6 hours as needed.
• Take at the right time: It’s usually better to take the dose before the pain becomes severe, and then continue as needed within the day’s limit.
• Stop and seek advice: If you need it for more than a few days for pain or fever, or if symptoms return quickly, get advice.

Follow the label: The maximum number of tablets per day can vary by strength and product. Always read your specific pack.

Dosing guidance (adults and children)

Dosing must match the product strength and age group. The below is general information intended to help you understand typical OTC use in the UK; always use the dose on your specific packaging.

Adults (general OTC use)

• Common strength: 200 mg tablets/capsules are widely sold OTC.
• Typical dose: 200–400 mg per dose, as needed.
• Interval: often 4–6 hours between doses.
• Maximum (important): Do not exceed the maximum daily dose stated on the pack.

Children

• Use child-specific formulations: Children typically require liquid or child-appropriate strengths and doses.
• Weight/age based dosing: Follow the dosing instructions on the bottle/box carefully. Never guess.
• Do not use adult tablets for young children: Unless the product instructions state it is suitable, because dose accuracy may be affected.

If you are giving ibuprofen to a child, check:

• The strength per 5 mL (if liquid) or per tablet
• The dosing schedule on the specific pack
• The maximum daily amount stated

Ibuprofen and food: interactions and practical advice

Ibuprofen can irritate the stomach in some people. Food can help reduce stomach discomfort. The extent of this effect depends on the person and the dose.

• Can you take it with food? Yes. Taking with or after food is often recommended, especially if you have a sensitive stomach.
• What if you take it on an empty stomach? Some people may feel heartburn, nausea or stomach pain.
• Absorption: Food may delay peak levels slightly, but it does not usually reduce effectiveness for short-term symptom control.

If you regularly take ibuprofen and you have a history of indigestion or stomach ulcers, discuss options with a pharmacist.

Alcohol and ibuprofen: safety considerations

Combining NSAIDs with alcohol can increase the risk of stomach irritation and bleeding. Alcohol may also make side effects such as dizziness or stomach upset more likely.

• Avoid heavy drinking while taking ibuprofen.
• If you drink alcohol and need ibuprofen repeatedly, consider whether you need an alternative (such as paracetamol) and speak to a healthcare professional for tailored advice.

Medicine interactions (what to watch for)

Ibuprofen can interact with other medicines. Always check labels and, if unsure, ask a pharmacist. Key interaction examples include:

• Other NSAIDs (e.g., naproxen, diclofenac, aspirin for pain): increased risk of stomach irritation and bleeding. Do not combine multiple NSAIDs unless advised.
• Anticoagulants and anti-platelet medicines (e.g., warfarin, apixaban, rivaroxaban, clopidogrel): higher risk of bleeding.
• Low-dose aspirin: the combination may increase gastrointestinal risk. Do not stop aspirin unless instructed. (Use depends on why you take aspirin.)
• Corticosteroids (e.g., prednisolone): higher risk of gastrointestinal adverse effects.
• Selective serotonin reuptake inhibitors (SSRIs) (e.g., sertraline, citalopram): may increase bleeding risk.
• Blood pressure medicines such as ACE inhibitors/ARBs (e.g., enalapril, lisinopril, losartan): NSAIDs may reduce kidney function and affect blood pressure control in some people.
• Diuretics (“water tablets”): risk of kidney problems may increase, especially with dehydration.
• Lithium and methotrexate: can interact significantly, requiring professional advice.
• Diabetes medicines (e.g., sulfonylureas/insulin): rare changes in blood sugar control may occur.

Dehydration risk: If you’re unwell (vomiting/diarrhoea) and drinking less, NSAIDs can become riskier. Ensure hydration and seek advice if symptoms are severe.

Safety profile: who should be cautious

Like all medicines, ibuprofen has potential side effects. Most people tolerate it well when used correctly. However, certain groups should be extra cautious or avoid it unless a professional advises.

Common side effects

• Indigestion, heartburn, nausea
• Stomach pain
• Headache or dizziness (less commonly)

Serious side effects (seek urgent advice)

Stop taking ibuprofen and seek medical help urgently if you experience:

• Signs of stomach bleeding such as black/tarry stools, vomiting blood, or unusual severe abdominal pain
• Allergic reactions like swelling of the face/lips, wheezing, or severe rash
• Breathing difficulties (especially in people with known NSAID sensitivity)
• Severe skin reactions (rare)
• Signs of kidney problems such as reduced urine output or marked swelling

People who should generally avoid ibuprofen or seek advice first

• History of stomach ulcers or gastrointestinal bleeding
• Known NSAID allergy or previous allergic reaction to ibuprofen/other NSAIDs
• Severe heart failure or significant heart disease (risk-benefit matters)
• Significant kidney disease
• Uncontrolled high blood pressure (needs caution)
• Asthma that is worsened by NSAIDs (some people experience bronchospasm)
• Pregnancy considerations:
  • NSAIDs are generally not recommended in later pregnancy.
  • For early pregnancy, risk may still apply—seek professional advice.

If you have any of the above, speak to a pharmacist for safer alternatives and dosing advice.

Practical tips for using ibuprofen effectively

• Use the lowest effective dose for the shortest time needed.
• Hydrate: If you’re active, it’s hot, or you’re unwell with fluid loss, dehydration can increase risks.
• Don’t “stack” painkillers unnecessarily: Avoid taking multiple NSAIDs together.
• Consider non-medicine measures: Rest, gentle movement, warmth/ice, and stretching can complement treatment.
• Track dose timing: If you take doses regularly, write down times to avoid exceeding daily limits.

If your pain is caused by something that needs assessment (e.g., severe dental pain, suspected injury, persistent fever), ibuprofen may help symptoms but should not delay getting appropriate care.

Alternative options (UK-friendly overview)

Depending on your symptoms, an alternative medicine may be more suitable. Common options include:

Paracetamol (acetaminophen)

• Best for: Pain and fever relief
• Stomach safety: Generally gentler on the stomach than NSAIDs
• Important: Avoid exceeding the maximum daily dose and be cautious with combination cold/flu products

Topical pain relief

• Gels/creams (e.g., topical NSAIDs) may help localised aches with less whole-body exposure
• Use as directed and consider skin sensitivity

Non-drug approaches

• Heat for muscle tightness, ice for sprains (as appropriate)
• Hydration and rest during viral illnesses
• Gentle activity to avoid stiffness

If you’re unsure which option is safest for you (particularly if you have stomach ulcers, kidney problems, or take blood-thinning medicines), consult a pharmacist.

Market and legal context in the United Kingdom

In the UK, ibuprofen products are widely available. The availability and pack size can vary by strength and formulation. Many ibuprofen preparations are sold without prescription in pharmacies and some shops, subject to retail classifications set by the UK regulatory framework.

The UK regulatory environment includes:

• Medicines and Healthcare products Regulatory Agency (MHRA) oversight
• Supply chain and labelling requirements for safety information, dose limits and contraindications
• Pharmacy/retail classification rules that determine where the medicine can be sold and the maximum quantities allowed

Product leaflets and packaging provide key information including dosing limits, contraindications and warnings. Always read these thoroughly.

Recent guidance and safety updates (general)

UK safety messaging for NSAIDs like ibuprofen often focuses on:

• Using the lowest effective dose for the shortest duration
• Awareness of stomach ulcer and bleeding risk, particularly with higher doses or longer use
• Extra caution in people at risk of kidney problems or who are dehydrated
• Importance of checking drug interactions (especially anticoagulants and other NSAIDs)
• Clear advice on pregnancy considerations, especially later pregnancy

Guidance can evolve as new evidence is reviewed. For the latest official safety advice, consult MHRA updates or speak to a pharmacist.

Delivery and availability

Ibuprofen is commonly stocked by UK pharmacies and online medicine retailers. Availability depends on:

• The chosen strength (e.g., 200 mg vs 400 mg)
• Formulation (tablets/capsules vs liquid)
• Local stock levels

Delivery: Many UK online pharmacies offer home delivery. Delivery speed varies by retailer and carrier. Some items may have different delivery options depending on formulation and pack size.

If you need ibuprofen urgently (for example, for fever in a child), check dispatch timelines and consider alternative options or local pharmacy availability.

FAQ (Frequently asked questions)

1) How quickly does ibuprofen work?

Many people notice symptom relief within about an hour. Peak benefit often occurs later (commonly 1–2 hours), though it depends on your formulation, the dose and whether you take it with food.

2) Can I take ibuprofen with food?

Yes. Taking ibuprofen with or after food can reduce stomach irritation for many people.

3) Is ibuprofen safe for everyone?

Not for everyone. People with a history of stomach ulcers/bleeding, NSAID allergy, significant kidney disease, certain heart conditions, or who are in later pregnancy should use extra caution or avoid ibuprofen unless advised. A pharmacist can help you choose the safest option.

4) Can I take ibuprofen with paracetamol?

Many people can take paracetamol and ibuprofen if needed, but it’s important to follow label instructions for both. Don’t exceed the maximum daily limits of either medicine. If you’re unsure, consult a pharmacist.

5) Can I take ibuprofen if I’m on blood thinners?

Interactions are possible and bleeding risk may increase. Check with a pharmacist or healthcare professional before using ibuprofen regularly or at higher doses.

6) What should I do if I miss a dose?

If you’re taking ibuprofen on a regular schedule, take it when you remember if it’s still close to the next dose time. If it’s nearly time for the next dose, skip the missed dose. Do not take double doses. Follow the dosing interval on your pack.

7) What if my symptoms don’t improve?

If pain or fever persists beyond the time stated on the pack, or you feel worse, seek medical advice. Persistent symptoms may need a different approach.

8) Can I drink alcohol while taking ibuprofen?

It’s best to avoid heavy alcohol intake while using ibuprofen. Alcohol can increase stomach irritation and bleeding risk. If you choose to drink, keep it moderate and stop if you feel unwell.

9) Are there any signs I should stop ibuprofen?

Stop and seek urgent advice if you notice signs of stomach bleeding (black stools, vomiting blood), severe allergic reaction, wheezing/breathing difficulty, or severe skin reactions.

10) Can children take ibuprofen?

Yes, but dosing must match the child’s age/weight and the correct child formulation. Use the instructions on the bottle/box exactly and check the maximum daily amount. If you’re unsure, ask a pharmacist.

Disclaimer: This information is for general guidance. Always read your product label and follow the instructions provided. If you have any medical concerns or complex medication regimens, ask a pharmacist for advice.