For over-the-counter use, adults can take up to 3 tablets (600 mg) of standard 200 mg ibuprofen every 4 to 6 hours, with a maximum of 1,200 mg (6 tablets) in 24 hours. Under a doctor’s supervision for conditions like arthritis, that ceiling can go as high as 3,200 mg per day. The difference matters, so here’s how to figure out what applies to you.
Standard Adult Doses
Most ibuprofen sold over the counter comes in 200 mg tablets. For general pain, headaches, or fever, the recommended dose is 200 to 400 mg (1 to 2 tablets) every 4 to 6 hours as needed. The single-dose maximum is 400 mg, and you should not exceed 1,200 mg in a 24-hour period when self-treating.
For menstrual cramps specifically, the Mayo Clinic lists 400 mg every 4 hours as needed, which can add up faster over the course of a day. Even so, the same 1,200 mg OTC ceiling applies unless your doctor tells you otherwise.
Prescription-strength ibuprofen is a different situation. For chronic inflammatory conditions like rheumatoid arthritis or osteoarthritis, doctors may prescribe up to 3,200 mg per day, divided into three or four doses. That’s roughly 800 mg taken three to four times daily. This higher range requires medical supervision because the risk of side effects rises with the dose.
Timing Between Doses
Spacing matters as much as the total count. Wait at least 4 to 6 hours between doses. Taking your next dose too early is one of the most common ways people accidentally exceed safe limits. If a dose wears off before the 4-hour mark, that’s a signal the pain may need a different approach rather than more frequent ibuprofen.
The FDA label also advises using the smallest effective dose. If one 200 mg tablet handles your headache, there’s no benefit to taking two. And regardless of dose, you should not self-treat with ibuprofen for more than 10 consecutive days without medical guidance.
Doses for Children and Teens
Children’s doses are based on weight, not age. Ibuprofen should not be given to infants under 6 months old. For older children, liquid formulations (100 mg per 5 mL) or chewable tablets are dosed according to the child’s weight, repeated every 6 to 8 hours (longer intervals than adults). A child weighing 48 to 59 pounds, for example, would take 200 mg per dose, while a child between 24 and 35 pounds takes 100 mg.
By the time a child weighs 96 pounds or more, the dose reaches the standard adult single dose of 400 mg. If you’re unsure, the dosing chart on the package or your pediatrician’s office is the safest reference.
What Happens if You Take Too Much
Ibuprofen has a relatively wide safety margin compared to some other pain relievers. Doses under 100 mg per kilogram of body weight generally cause minimal symptoms. For a 150-pound adult, that works out to roughly 6,800 mg before even mild toxicity is expected. Life-threatening effects typically don’t appear until around 400 mg per kilogram, a massive amount.
That said, “not life-threatening” doesn’t mean “harmless.” In a review of 126 ibuprofen overdose cases, about 19% of patients developed symptoms, most commonly nausea, vomiting, abdominal pain, and drowsiness. These symptoms usually appeared within 4 hours. At very high doses, more serious effects can include seizures, dangerously low blood pressure, and kidney or liver problems.
If you realize you’ve accidentally doubled a dose, you’re unlikely to experience anything worse than an upset stomach. But consistently exceeding recommended limits day after day is where the real danger lies.
Risks of Regular High-Dose Use
The two biggest concerns with ongoing ibuprofen use are stomach bleeding and kidney damage. Ibuprofen reduces the protective lining of the stomach, and the risk of a bleeding ulcer increases the longer you take it and the higher the dose. The FDA’s label specifically warns that taking more than directed, or for longer than directed, raises the chance of stomach bleeding.
Kidney damage is the other major risk. Ibuprofen can disrupt blood flow to the kidneys, and in certain people this triggers acute kidney injury. That injury can progress to chronic kidney disease. The risk is highest for people who are dehydrated, already have reduced kidney function, or take blood pressure medications alongside ibuprofen.
Long-term continuous use also increases the risk of heart attack or stroke. This applies to all doses but is more pronounced at higher amounts taken over weeks or months.
Who Should Take Less
Several groups need to use lower doses or avoid ibuprofen entirely. Older adults are more vulnerable to both kidney and stomach side effects, even at standard doses. If you’re over 65, using the lowest effective dose for the shortest time is especially important.
People with existing kidney disease (particularly those with severely reduced kidney filtration) should not take ibuprofen at all. The same goes for anyone with a history of stomach ulcers or gastrointestinal bleeding.
Taking ibuprofen alongside blood pressure medications, particularly the combination of a blood pressure drug, a diuretic (water pill), and ibuprofen together, can be hard on the kidneys. If you take any of these regularly, your safe daily limit may be lower than the standard recommendations.
Ibuprofen During Pregnancy
The FDA warns against using ibuprofen at 20 weeks of pregnancy or later. After that point, it can cause kidney problems in the developing baby, leading to dangerously low amniotic fluid levels. After 30 weeks, ibuprofen poses an additional risk of prematurely closing a blood vessel in the baby’s heart. If ibuprofen is absolutely necessary between weeks 20 and 30, the guidance is to use the lowest dose for the shortest possible time, ideally no more than 48 hours.