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Ibuprofen is one of the best-selling painkillers worldwide and is available over the counter in Germany. It relieves pain, lowers fever and inhibits inflammation. But although it is available over the counter, ibuprofen is not a harmless drug: Incorrect dosage, taking too long, or certain pre-existing conditions can cause serious side effects.
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This article is for information and does not replace medical advice. For severe stomach pain, blood in the stool, breathlessness, or chest pain: see a doctor at once or call the emergency services (112; or 999/112 in the UK).
Ibuprofen is the best-selling over-the-counter painkiller in Germany. It combines three properties in one: pain relief, fever reduction, and – at a sufficiently high dose – anti-inflammatory action. This makes it the most versatile OTC painkiller – but also the painkiller with the broadest interaction profile.
| Property | Details |
|---|---|
| Active substance | Ibuprofen (2-(4-isobutylphenyl)propionic acid) |
| ATC code | M01AE01 (propionic acid derivatives) |
| Drug class | Non-steroidal anti-inflammatory drug (NSAID) |
| Available forms | Tablets, capsules, oral solution, suppositories, gel/cream, granules |
| Half-life | Approx. 2–3 hours |
| Over the counter up to | 400 mg single dose / 1,200 mg daily dose |
| Prescription only from | >400 mg single dose (e.g. 600 mg, 800 mg) |
| Onset of action | Approx. 30–60 min (faster with ibuprofen lysinate) |
Typical uses: back pain, headaches, joint pain, period pain, toothache, and fever.
Ibuprofen inhibits the enzymes cyclo-oxygenase-1 (COX-1) and cyclo-oxygenase-2 (COX-2). These enzymes produce prostaglandins – messenger substances that trigger and amplify pain, fever, and inflammation. By inhibiting both enzymes, prostaglandin production falls, which relieves pain, fever, and inflammation.
COX-2 is active above all at sites of inflammation and is the actually desired target. COX-1, on the other hand, has a protective function: it produces prostaglandins that protect the stomach lining and form thromboxane A2 in the platelets. When COX-1 is inhibited, the stomach lining loses its protection – this explains the stomach problems. And the thromboxane level falls, which affects blood clotting.
Diclofenac is considerably more COX-2-selective than ibuprofen – it inhibits COX-2 more strongly relative to COX-1. COX-2 in the blood vessels produces prostacyclin, which widens the vessels and inhibits clot formation. Inhibiting COX-2 strongly shifts the balance in favour of thromboxane – that is, vasoconstriction and a tendency to thrombosis. With ibuprofen this effect is smaller than with diclofenac, but present – especially at higher doses above 1,200 mg daily. Above this threshold, the heart-attack risk of ibuprofen also rises measurably.
Ibuprofen lysinate is ibuprofen that has been combined with the amino acid lysine. This salt dissolves in water considerably faster than conventional ibuprofen – and is thereby absorbed faster from the small intestine. The onset of action is about 15–20 minutes earlier. Important: the strength and duration of action are identical – ibuprofen lysinate is not a stronger ibuprofen, only a faster one. For acute attacks such as migraine or sudden severe headaches it is therefore the better choice. It is also tolerated somewhat better on an empty stomach than classic ibuprofen.
The principle is: as low as possible, for as short a time as needed. This is not an empty phrase – every extra day and every extra 200 mg raises the gastric, renal, and cardiac risk. The German National Care Guideline on Low Back Pain recommends NSAIDs at the lowest effective dose for the shortest possible time.
| Use | Single dose | Max. daily dose | Note |
|---|---|---|---|
| Mild to moderate pain (over the counter) | 200–400 mg | 1,200 mg | Max. 3–4 days without a doctor |
| Fever | 200–400 mg | 1,200 mg | Fever >3 days: see a doctor |
| Severe pain (prescription only) | 400–800 mg | 2,400 mg | Only on medical prescription |
| Rheumatic conditions | 1,200–2,400 mg | 2,400 mg | Long-term under medical supervision |
Ibuprofen should, where possible, not be taken on an empty stomach. Taking it during or directly after a meal considerably reduces the risk of stomach pain and heartburn – even though this delays the onset of action by 15–30 minutes. For most everyday situations this is not a problem. Anyone who needs a fast effect – for instance in acute migraine – can reach for ibuprofen lysinate, which is also better tolerated on an empty stomach.
Further intake rules: take with a large glass of water, not with milk or juice. Swallow tablets whole. Keep at least 6–8 hours between single doses. If a dose is forgotten: never take a double dose – simply continue at the next regular time. No alcohol during use – the combination considerably increases the risk of stomach bleeding.
Ibuprofen is well tolerated with short, low-dose use. But the rate of side effects rises considerably with the size of the dose and the duration of use. The three most relevant areas of risk are the gastrointestinal tract, the cardiovascular system, and the kidneys.
Stomach pain, heartburn, and nausea are the most common complaints. They arise because ibuprofen, through COX-1 inhibition, reduces the protective prostaglandins of the stomach lining. With longer use, stomach ulcers and stomach bleeding can develop – especially in patients over 65, with concurrent corticosteroid use, or with pre-existing stomach disease. Anyone in these risk groups should take ibuprofen only together with a proton-pump inhibitor like pantoprazole.
Black or bloody stool is a warning sign of gastrointestinal bleeding and always an emergency – see a doctor at once or call the emergency services (112; or 999/112 in the UK).
At daily doses above 1,200 mg and with continuous therapy, the risk of heart attack and stroke rises measurably. The risk is lower than with diclofenac, but present. Particularly relevant for patients with pre-existing heart disease, high blood pressure, or diabetes. Ibuprofen can also raise blood pressure and weaken the effect of blood-pressure-lowering agents like ramipril or candesartan. Anyone who notices suddenly worse-controlled blood pressure should think of their painkiller.
Ibuprofen inhibits prostaglandins in the kidneys that are important for regulating the kidney vessels. With short use this is no problem for healthy kidneys. With longer use, with dehydration, with pre-existing kidney disease, or in combination with diuretics and ACE inhibitors/sartans, the triple-whammy risk arises: a triple burden on the kidneys that in the worst case leads to acute kidney failure. More on this in chapter 6.
Ibuprofen has a considerable interaction potential, which is often underestimated in everyday life – because it is available over the counter and is therefore regarded as "harmless". The most dangerous combinations affect heart patients and blood-pressure patients.
Anyone who takes low-dose aspirin daily for heart prevention and additionally takes ibuprofen risks having aspirin's cardioprotection cancelled. The mechanism is the same as with diclofenac: ibuprofen occupies the COX-1 binding site reversibly – before aspirin can bind there irreversibly. If ibuprofen is there first, aspirin no longer finds a free spot. The way out: take aspirin at least 30 minutes before ibuprofen – or better, choose paracetamol as the painkiller, which does not have this interaction.
The most dangerous three-way combination in self-medication: ibuprofen (or diclofenac) together with an ACE inhibitor like ramipril or a sartan like candesartan and a diuretic gives the triple whammy. All three mechanisms hit kidney function at the same time and can lead to acute kidney failure. Anyone taking blood-pressure-lowering medication and a diuretic should avoid ibuprofen as a rule and switch to paracetamol. The brite interaction check detects this combination automatically.
| Medication / substance | Interaction | Recommendation |
|---|---|---|
| Aspirin for heart prophylaxis | Blocks the platelet-inhibiting effect of aspirin | Ibuprofen at least 30 min after aspirin, or paracetamol |
| Blood thinners (Marcumar, Eliquis, Xarelto) | Increased bleeding risk | Avoid the combination where possible |
| ACE inhibitors / sartans | Effect weakened + triple whammy with a diuretic | Monitor blood pressure, prefer paracetamol |
| Diuretics | Triple whammy → kidney failure | Monitor kidney values, drink enough |
| Lithium | Raises the lithium level → toxicity | Monitor lithium levels |
| Methotrexate | Delays MTX excretion → toxicity | Only under medical supervision |
| Corticosteroids | Considerably increased stomach-bleeding risk | Stomach protection (pantoprazole) required |
| SSRIs (citalopram, escitalopram) | 12-fold increased GI bleeding risk | Paracetamol instead of an NSAID! |
| Alcohol | Increased stomach-bleeding risk | No alcohol during use |
