For an ordinary headache, paracetamol and ibuprofen relieve pain about equally well, so neither is a clear winner on strength alone. They work in different ways in the body, though, which is why they suit different people and carry different risks. The more useful question is which one fits your health, your other medicines, and how often you get headaches.
Which Works Better for an Everyday Tension Headache
Tension-type headache is the common, band-like pressure most people get from stress, tiredness, or poor posture. In trials, a 1,000 mg dose of paracetamol worked about as well as 400 mg of ibuprofen for these headaches.1PubMed Central. Paracetamol (acetaminophen) for acute treatment of episodic tension-type headache in adults Smaller paracetamol doses of 500 to 650 mg, a single standard tablet, did no better than a dummy pill.2PubMed Central. Paracetamol (acetaminophen) for acute treatment of episodic tension-type headache in adults So if you choose paracetamol, the usual adult dose is two 500 mg tablets, not one.
Many people take a single 500 mg tablet, feel nothing, and decide paracetamol doesn’t work. Two tablets (1,000 mg) is the standard adult dose, up to four times a day. Ibuprofen’s usual over-the-counter dose is 200 to 400 mg, up to three times a day. Packs differ, with some ibuprofen tablets at 200 mg and others at 400 mg, so check the milligrams on the label before judging a pill a failure.
There are small differences in timing. Paracetamol was slightly more likely to have you pain-free at 1 hour, ibuprofen slightly more likely at 2 hours.3PubMed Central. Paracetamol versus ibuprofen in treating episodic tension-type headache: a systematic review and network meta-analysis People who took paracetamol were also the least likely to need a second medicine later.4PubMed Central. Paracetamol versus ibuprofen in treating episodic tension-type headache: a systematic review and network meta-analysis These gaps are small, and either is a reasonable first choice.
Neither drug clears every headache. Pain easing to a manageable level still counts as the drug working. Give a correctly dosed pill an hour or two before deciding it hasn’t worked, and don’t keep topping up in the meantime. Each drug has a minimum wait between doses written on the pack. If a properly dosed pill fails on several separate headaches, trying the other drug is reasonable.
Which Is Better for a Migraine
Ibuprofen has a modest edge, especially in children. In children with moderate or severe migraine, ibuprofen was twice as likely as paracetamol to stop the attack within 2 hours.5PubMed. Ibuprofen or acetaminophen for the acute treatment of migraine in children: a double-blind, randomized, placebo-controlled, crossover study Another trial in children found nearly identical results, with 80% getting relief on either drug.6PubMed. Paracetamol versus Ibuprofen for the Acute Treatment of Migraine Headache in Children: A Blinded Randomized Controlled Trial Given by drip in hospital, the two eased migraine pain at a similar rate.7Eurasian Journal of Emergency Medicine. Efficacy of Intravenous Paracetamol, Dexketoprofen, and Ibuprofen in Treating Headache Induced by Acute Migraine Attack For migraine, ibuprofen may be a slightly better first try, but paracetamol is a fair alternative.
Nausea and slowed digestion during an attack can delay how quickly a tablet is absorbed, which is why relief can feel late. Taking the pill at the first sign of pain, before the attack is in full swing, generally works better than waiting to see how bad it gets. If over-the-counter pills rarely control your migraines, a doctor can prescribe migraine-specific medicines that act on the attack itself.
A tension headache usually feels like a tight band or steady pressure on both sides of the head, and it rarely causes vomiting. A migraine is often one-sided and pulsing, tends to get worse when you move or climb stairs, and may come with nausea or a wish to lie in a dark room. These are patterns rather than a strict test, since some people have both types and some migraines are felt on both sides.
How Each Drug Works and Why It Matters
Ibuprofen blocks an enzyme the body uses to make prostaglandins, chemicals that drive pain, fever, and swelling.8News-Medical. Ibuprofen Mechanism So it reduces inflammation as well as pain. Paracetamol works mostly in the brain and spinal cord, partly by boosting the brain’s own pain-dampening signals.9PubMed. Paracetamol (Acetaminophen): mechanisms of action Exactly how it works is still not fully understood.10PubMed Central. Paracetamol (acetaminophen): A familiar drug with an unexplained mechanism of action
That means paracetamol does little for swelling. It also avoids many of the stomach and kidney effects tied to blocking prostaglandins, which help protect the stomach lining and keep blood flowing to the kidneys.
In practice, a headache with sore neck or jaw muscles may respond a little better to ibuprofen, because inflammation may be part of the picture. A plain pressure headache with no swelling or soreness gives ibuprofen no particular advantage. Paracetamol’s main danger is to the liver, and it arises when someone takes more than the daily limit rather than at normal doses.
Which Is Safer for Your Stomach, Heart and Blood Pressure
Ibuprofen belongs to the NSAIDs, anti-inflammatory painkillers that also include aspirin and naproxen. Taken for up to a week at over-the-counter doses, ibuprofen caused stomach upset about as often as paracetamol, around 1 in 8 people for each.11PubMed. Gastrointestinal tolerability of ibuprofen compared with paracetamol and aspirin at over-the-counter doses The difference is in the rare serious cases: when a stomach bleed did happen, bleeds in ibuprofen users more often needed surgery, 11% versus 3%.12PubMed. Outcome of upper gastro-intestinal bleeding and use of ibuprofen versus paracetamol
A past ulcer or stomach bleed makes ibuprofen a poor choice, and paracetamol is the safer default. Aspirin and naproxen are in the same family, so avoiding ibuprofen means avoiding those too unless a doctor says otherwise. If you do take ibuprofen, taking it with food or milk can ease stomach upset, and the lowest dose that works for the shortest time is best. Stop and seek help for black stools or vomiting blood.
Ibuprofen can also weaken blood pressure medicines, including beta blockers, water pills, and ACE inhibitors.13PubMed. Interactions between ibuprofen and antihypertensive drugs: incidence and clinical relevance in dental practice In people with treated high blood pressure, 3 weeks of ibuprofen raised the lower blood pressure number by about 6 points, while paracetamol did not.14PubMed. Ibuprofen Interferes with the Efficacy of Antihypertensive Drugs The effect usually takes more than 5 days of regular use to appear.15PubMed. Interactions between ibuprofen and antihypertensive drugs: incidence and clinical relevance in dental practice One dose for an occasional headache is a much smaller worry than taking it daily for weeks. If you take blood pressure tablets, paracetamol is the better choice for regular headache relief. If you have to use an anti-inflammatory painkiller regularly, tell your doctor or pharmacist so they can check your readings.
Ibuprofen can strain the kidneys, so people with kidney disease should ask a pharmacist before using it at all. People on blood thinners face a higher bleeding risk with it, so paracetamol is usually the safer headache choice for them.
Heart and stroke risks are harder to pin down. Large comparisons of heart attack, stroke, and kidney problems couldn’t separate the drugs’ effects from the health of the people taking them.16PubMed Central. Channeling Bias in the Analysis of Risk of Myocardial Infarction, Stroke, Gastrointestinal Bleeding, and Acute Renal Failure with the Use of Paracetamol Compared with Ibuprofen Neither drug made asthma attacks or wheezing more likely in children.17PubMed Central. Risk of wheezing and asthma exacerbation in children treated with paracetamol versus ibuprofen: a systematic review and meta-analysis of randomised controlled trials
Pregnancy, Children and Alcohol
Paracetamol is the first-choice painkiller in pregnancy, taken for the shortest time needed.18nhs.uk. Headaches in pregnancy Ibuprofen should be avoided unless a doctor prescribes it.19nhs.uk. Headaches in pregnancy NSAIDs carry established risks to the baby in the third trimester.20PubMed. Medication Use and Pain Management in Pregnancy: A Critical Review UK regulators say there is no evidence that paracetamol in pregnancy causes autism.21nhs.uk. Headaches in pregnancy Check with a doctor or midwife before taking ibuprofen at any stage. If headaches are frequent or severe, tell your midwife or doctor, because a new bad headache can occasionally signal a problem such as high blood pressure.
For children, both drugs work for migraine, as the trials above show. Doses go by weight, so use the children’s formula and its supplied spoon or syringe rather than cutting down an adult tablet. Many children’s cold and flu products already contain paracetamol, so never give two products with the same active ingredient.
Alcohol changes the picture for the stomach. Drinking alone nearly triples the chance of an upper stomach bleed, and adding an NSAID raises it to about six times a non-drinker’s.22The American Journal of Managed Care. The Use and Effect of Analgesics in Patients Who Regularly Drink Alcohol For most people, a recent drink does not make normal doses of paracetamol harmful to the liver.23PubMed. Adverse drug interactions involving common prescription and over-the-counter analgesic agents After drinking, normal-dose paracetamol is generally the safer pick, as long as you never exceed the daily maximum. Heavy daily drinkers should ask a doctor about a safe limit.
Can You Combine Them or Add Caffeine
Taking paracetamol and ibuprofen together gives stronger pain relief than either alone, without extra safety problems.24PubMed Central. Paracetamol and ibuprofen combination for the management of acute mild-to-moderate pain in children: expert consensus using the Nominal Group Technique (NGT) That makes it a useful option when one drug on its own hasn’t worked.25PubMed Central. Paracetamol and ibuprofen combination for the management of acute mild-to-moderate pain in children: expert consensus using the Nominal Group Technique (NGT)
You can take both at once, or alternate them a few hours apart, as long as each drug’s spacing and daily maximum are respected. Check the labels on every product, since a combination cold remedy may already contain paracetamol or ibuprofen and quietly double up an ingredient.
Adding about 100 mg of caffeine, roughly a cup of coffee, helps 5 to 10 more people in every 100 get good pain relief.26PubMed Central. Caffeine as an analgesic adjuvant for acute pain in adults Caffeine also helps paracetamol absorb faster, so relief comes sooner.27PubMed Central. Paracetamol and Caffeine Combination in Pain Management: A Narrative Review
There are downsides. Caffeine late in the day can disturb sleep, and a poor night can bring on the next headache. Regular high caffeine intake can itself cause withdrawal headaches when you skip your usual cup. A caffeine-containing painkiller counts toward your daily caffeine, so remember it if you also drink coffee or tea.
How Fast They Work and How Often Is Too Often
Fast-acting paracetamol tablets started easing pain sooner than standard ibuprofen in some trials, though not all.28Taylor & Francis Online / PubMed Central. Analgesic onset and efficacy of a fast-acting formulation of acetaminophen in a postoperative dental impaction pain model Relief usually begins within an hour, but the pain often needs another hour or so to ease fully. Food can make painkillers take up to nearly three times as long to reach their peak.29PubMed Central. Effects of food on pharmacokinetics of immediate release oral formulations of aspirin, dipyrone, paracetamol and NSAIDs – a systematic review A tablet taken after a big meal will work later than one on an empty stomach. For fastest relief, paracetamol on an empty stomach works well, while ibuprofen with food trades a little speed for stomach comfort, a fair deal if your stomach is sensitive.
Taking either drug on 15 or more days a month puts people with migraine at risk of medication overuse headache, a rebound headache caused by the painkillers themselves.30Harvard Health. Stopping the vicious cycle of rebound headaches No single painkiller is safe from causing it.31PubMed. Analgesic rebound headache in clinical practice: data from a physician survey
A rebound headache cycle often looks like near-daily headaches that start on waking. Pills help briefly, then the headache returns as they wear off, leading to another dose. Stopping the painkillers, ideally with a doctor’s help, usually breaks the cycle, though headaches may worsen for a few days first. Count your painkiller days on a calendar, because it is easy to underestimate how often you reach for the box.
Some headaches need a doctor. A sudden, severe “worst ever” headache needs urgent care, as does a headache with fever, stiff neck, confusion, or weakness. Needing painkillers several days a week is worth a GP visit to talk about prevention.