For most adults, the standard over-the-counter dose of ibuprofen is 200 to 400 mg per dose, taken every 4 to 6 hours as needed. You should not exceed 1,200 mg in 24 hours when self-treating without a doctor’s guidance. Prescription doses can go higher, up to a maximum of 3,200 mg per day, but only under medical supervision.
Standard Adult Dose
Over-the-counter ibuprofen tablets typically come in 200 mg. For a headache, menstrual cramps, muscle ache, or mild fever, one tablet (200 mg) is often enough. If that doesn’t provide relief, two tablets (400 mg) is the standard single dose most adults use effectively. You can repeat the dose every 4 to 6 hours as needed, but don’t take more than 6 doses (1,200 mg total) in a 24-hour period unless directed by a doctor.
The 400 mg single dose is also what many pediatricians list as the standard adult dose on weight-based dosing charts. If you weigh significantly less than average, starting with 200 mg makes sense. For most people, though, 400 mg hits the sweet spot between effective relief and minimal side effects.
Prescription Doses: 600 mg and 800 mg
Tablets of 400 mg, 600 mg, and 800 mg are only available by prescription. Doctors prescribe these higher doses for conditions like rheumatoid arthritis and osteoarthritis, where the daily total can range from 1,200 mg up to 3,200 mg, split into three or four doses throughout the day. That upper limit of 3,200 mg per day is the absolute maximum for any adult.
At these higher levels, the principle is to use the lowest effective dose for the shortest time needed. Higher doses carry a meaningfully greater risk of stomach, kidney, and cardiovascular problems, which is why they require medical oversight.
How Often You Can Take It
For over-the-counter use, adults and anyone over 12 can take ibuprofen every 4 to 6 hours. Children and infants (6 months and older) should wait 6 to 8 hours between doses and take no more than 4 doses in 24 hours. Children’s doses are based on body weight, not age alone.
For prescription-strength ibuprofen used to manage arthritis, the typical schedule is three or four times per day at consistent intervals. If you’re using it for occasional pain rather than a chronic condition, take it only when you need it rather than on a fixed schedule.
With Food or Without
You’ve probably heard you should always take ibuprofen with food. The reality is more nuanced. At standard OTC doses (up to 1,200 mg daily for up to 7 days), you can safely take ibuprofen on an empty stomach, and doing so actually provides faster pain relief. Food slows how quickly ibuprofen is absorbed, though it doesn’t change the total amount your body takes in.
There’s actually no strong scientific evidence that taking low-dose ibuprofen with food prevents stomach irritation. The main way ibuprofen irritates the stomach lining is by blocking protective compounds in the gut wall, a process that happens regardless of whether there’s food present. That said, this changes at higher doses. Prescription-strength ibuprofen (above 1,200 mg daily) carries two to three times the risk of stomach irritation, so taking it with food at those levels is a reasonable precaution.
Dosing for Children
Ibuprofen should not be given to infants younger than 6 months. For children 6 months and older, the dose is based on weight, typically 5 to 10 mg per kilogram of body weight per dose, given every 6 to 8 hours with a maximum of 4 doses per day. Children’s ibuprofen comes in liquid suspensions and chewable tablets with lower concentrations to make accurate dosing easier.
Avoid giving children combination medications (products with multiple active ingredients) before age 6. Stick with single-ingredient ibuprofen and use the dosing syringe or cup that comes with the product rather than a kitchen spoon.
Who Should Be Cautious
Certain conditions make ibuprofen riskier at any dose. People with a history of stomach ulcers or gastrointestinal bleeding face greater odds of those problems recurring. The same applies if you’re 65 or older, drink alcohol regularly, smoke, or take blood thinners or corticosteroids.
Ibuprofen can also raise blood pressure and worsen existing heart disease, heart failure, or kidney disease. People with aspirin-sensitive asthma may have the same reaction to ibuprofen. And if you’re past 30 weeks of pregnancy, ibuprofen should not be taken at all, as it can cause complications for the baby.
For short-term pain or fever in an otherwise healthy adult, ibuprofen at OTC doses is well tolerated. The risks climb with dose and duration, so the general rule holds: take the smallest amount that works, and stop when you no longer need it.