Adults can take ibuprofen every four to six hours as needed for pain, with a maximum of 1,200 mg per day when using over-the-counter doses. That means if you’re taking the standard 200 mg tablets, you can take one or two tablets up to three times a day. The exact spacing depends on what you’re treating and how much you’re taking per dose.
Standard Dosing for Adults
For mild to moderate pain, the standard adult dose is 200 to 400 mg every four to six hours. Most over-the-counter ibuprofen comes in 200 mg tablets, and the typical recommendation is one to two tablets per dose. You shouldn’t exceed 1,200 mg (six tablets) in 24 hours when self-treating without a doctor’s guidance.
For menstrual cramps, the dosing is slightly more aggressive: 400 mg every four hours as needed. This reflects the fact that ibuprofen works particularly well for menstrual pain when taken at higher, more frequent intervals. For chronic conditions like arthritis, doctors sometimes prescribe up to 3,200 mg per day, divided into three or four doses. That’s a substantially higher ceiling than what’s recommended for occasional use, and it requires medical supervision.
How Long Each Dose Lasts
Ibuprofen’s pain-relieving effects typically last four to six hours in adults. The drug is absorbed quickly, usually reaching peak levels in your blood within one to two hours of taking it. This is why the minimum gap between doses is four hours: taking another dose sooner means the previous one hasn’t cleared enough, and you risk stacking up to levels that stress your stomach and kidneys.
If you find that pain returns consistently at the four-hour mark, that’s a sign you’re at the shorter end of the drug’s effective window. You can safely redose at that point, but if you’re doing so repeatedly, you may be better served by spacing 400 mg doses every six hours rather than taking smaller amounts more often.
How Many Days in a Row Is Safe
For pain, you shouldn’t take ibuprofen for more than 10 consecutive days without talking to a doctor. For fever, the limit is shorter: three days. These aren’t arbitrary cutoffs. Longer use increases the risk of stomach ulcers, kidney strain, and cardiovascular problems. The FDA has strengthened its warnings that all non-aspirin anti-inflammatory drugs, including ibuprofen, can increase the risk of heart attacks and strokes, and that risk grows with duration of use.
There’s also the issue of rebound headaches. If you’re taking ibuprofen for headaches specifically, using it 15 or more days per month can trigger medication overuse headaches, a cycle where the drug itself starts causing the pain it’s supposed to treat. This is one of the most common reasons chronic headache sufferers find their condition worsening over time.
Dosing for Children
Children can take ibuprofen every six to eight hours, not every four to six like adults. The longer interval matters because children metabolize the drug differently. Doses are based on weight, not age, so always check the packaging or ask a pharmacist for the right amount. Ibuprofen should not be given to infants under six months old, as it hasn’t been established as safe for that age group and isn’t FDA-approved for them.
Protecting Your Stomach
Ibuprofen works by blocking enzymes that produce inflammation, but those same enzymes also help maintain the protective lining of your stomach. This is why ibuprofen can cause irritation, nausea, or ulcers, especially with frequent use. Taking it at the end of a full meal or with an antacid helps reduce this effect. Alcohol compounds the problem, so limiting drinks while you’re using ibuprofen regularly is a good idea.
If you need ibuprofen frequently and have a history of stomach problems, your doctor may recommend taking a stomach-protecting medication alongside it. This is common for people on long-term prescriptions for arthritis.
Older Adults and Kidney Concerns
If you’re over 65, the standard adult dose still applies on paper, but the risks are meaningfully higher. Older adults experience more frequent side effects from anti-inflammatory drugs, particularly gastrointestinal bleeding, which can be severe. Starting at the lowest effective dose and using ibuprofen for the shortest possible time is the general principle.
Kidney function also declines with age, and ibuprofen reduces blood flow to the kidneys. If you already have impaired kidney function, even standard doses taken at normal intervals can cause problems. People with severe kidney impairment (a filtration rate below 30 mL/min) should not take ibuprofen at all. If you’re unsure about your kidney function, a basic blood test can clarify where you stand.
Timing Around Aspirin
If you take daily low-dose aspirin for heart protection, the timing of your ibuprofen dose matters. Ibuprofen can block aspirin’s blood-thinning effect if the two drugs compete for the same binding sites. To avoid this, take ibuprofen at least 30 minutes after your aspirin, or at least 8 hours before your next aspirin dose. This spacing allows aspirin to do its job on your platelets before ibuprofen enters the picture. Taking them at the same time, or ibuprofen shortly before aspirin, can essentially cancel out aspirin’s cardiovascular benefit.