For adults, ibuprofen can be taken every 6 to 8 hours as needed, with a maximum of 1,200 mg per day when using over-the-counter strengths. That typically means up to three doses of 400 mg (or two standard 200 mg tablets) spread throughout the day. Staying within these limits and keeping your use short-term is the simplest way to get pain relief while avoiding side effects.
Standard Dosing Schedule for Adults
Over-the-counter ibuprofen comes in 200 mg tablets. The usual dose is 200 to 400 mg every 6 to 8 hours, which works out to three or four doses per day at most. The over-the-counter ceiling is 1,200 mg in 24 hours. Prescription doses can go as high as 3,200 mg per day for conditions like rheumatoid arthritis, but those higher amounts are divided into three or four doses and monitored by a doctor.
If a single 200 mg dose handles your pain, there’s no reason to take more. Start with the lowest effective dose and space it out as long as you comfortably can. Taking 400 mg every 8 hours, for example, keeps you well within the daily limit while giving steady coverage.
Dosing for Children
Children can take ibuprofen every 6 to 8 hours, just like adults, but the dose is based on weight rather than a fixed number of milligrams. Ibuprofen is not considered safe for infants under 6 months old. For older children, liquid formulations and chewable tablets come with weight-based charts on the packaging. Follow those charts closely rather than estimating.
How Long You Can Keep Taking It
The NHS recommends not taking ibuprofen tablets for more than 10 consecutive days unless a doctor has told you otherwise. That 10-day window applies to self-treating everyday pain like headaches, muscle soreness, or menstrual cramps. If your pain hasn’t resolved by then, the issue likely needs a proper evaluation rather than more ibuprofen.
For short-term, occasional use, ibuprofen is well tolerated by most people. The risks start climbing when it becomes a daily habit over weeks or months.
What Happens to Your Body Over Time
Ibuprofen works by blocking enzymes that produce inflammation. Unfortunately, those same enzymes also help protect your stomach lining and maintain blood flow to your kidneys. When you suppress them repeatedly, those organs pay a price.
Long-term use, defined in kidney research as taking six or more pills a day for three years or longer, is linked to a condition called analgesic nephropathy. This involves progressive damage to the internal structures of the kidney and can lead to chronic kidney failure in severe cases. You don’t need to worry about this from a few days of use, but it’s why daily, indefinite ibuprofen isn’t something to do on your own.
Stomach irritation is the more immediate concern. At prescription-level doses (above 1,200 mg per day), the risk of stomach and intestinal problems rises two to three times compared to lower doses. This includes ulcers, bleeding, and general gastric discomfort. The mechanism is systemic, meaning it comes from the drug’s effect on your whole body, not just from the pill sitting in your stomach.
Cardiovascular Risk at Higher Doses
A large meta-analysis found that people taking 2,400 mg or more of ibuprofen per day face a higher risk of heart attack and stroke compared to people not taking it. At the standard over-the-counter dose of up to 1,200 mg per day, no increased cardiovascular risk was observed. The data on doses between 1,200 and 2,400 mg is less clear, so that middle range carries some uncertainty.
People with existing heart disease, uncontrolled high blood pressure, or a history of stroke should be especially cautious with high doses. For everyone else, sticking to over-the-counter amounts keeps this risk off the table.
Taking It With or Without Food
The common advice to always take ibuprofen with food turns out to be less evidence-based than you might expect. At standard over-the-counter doses (up to 1,200 mg per day for up to a week), there is no scientific evidence that taking it with food prevents stomach irritation. Taking it on an empty stomach actually provides faster pain relief.
This changes at higher, prescription-level doses. Above 1,200 mg per day, the risk of stomach irritation increases significantly, and eating something beforehand may help buffer the direct irritant effect on stomach tissue. So if you’re taking a couple of tablets for a headache, you can skip the snack. If you’re on a higher prescribed dose, food is a reasonable precaution.
Timing Around Low-Dose Aspirin
If you take a daily low-dose aspirin for heart protection, the timing of your ibuprofen matters. Ibuprofen can interfere with aspirin’s ability to prevent blood clots. The FDA recommends taking ibuprofen at least 30 minutes after your aspirin, or at least 8 hours before your next aspirin dose. This spacing preserves aspirin’s protective effect.
With occasional ibuprofen use, the risk of this interaction causing real harm is minimal. But if you’re taking both regularly, maintaining that timing gap is important. This guidance applies to immediate-release aspirin; for enteric-coated aspirin, there isn’t enough data to make a clear recommendation.
Practical Guidelines for Safe Use
- Dose: 200 to 400 mg every 6 to 8 hours, up to 1,200 mg per day for OTC use
- Minimum spacing: 6 hours between doses
- Duration: No more than 10 consecutive days for self-treatment
- Children: Every 6 to 8 hours, dosed by weight, not for infants under 6 months
- Aspirin users: Take ibuprofen 30 minutes after or 8 hours before aspirin
Your body clears most of a single dose within 24 hours, with roughly 50 to 60 percent excreted through urine as breakdown products. This relatively quick clearance is why the 6- to 8-hour dosing window works: by the time you’re due for another dose, the previous one is largely processed. If you find yourself reaching for ibuprofen every day, that’s a signal to address the underlying cause of your pain rather than continuing to manage it with repeated doses.