For adults buying ibuprofen over the counter, the standard single dose is 200 to 400 mg, taken every four to six hours as needed, with a maximum of 1,200 mg (six 200 mg tablets) in 24 hours. Prescription doses for chronic conditions like arthritis can go higher, up to 3,200 mg per day, but only under medical supervision.
Standard Adult Doses
Most OTC ibuprofen comes in 200 mg tablets. For general pain relief, the recommended dose is 200 to 400 mg every four to six hours. You should not exceed six doses (1,200 mg total) in a 24-hour period when dosing yourself without a prescription.
For menstrual cramps, the effective dose tends to be at the higher end: 400 mg every four hours as needed. The same 400 mg dose applies for headaches, muscle aches, and mild to moderate pain in adults and teenagers. Taking ibuprofen with food or a glass of milk can reduce the chance of stomach irritation.
For inflammatory conditions like osteoarthritis and rheumatoid arthritis, prescription doses range from 1,200 mg to 3,200 mg per day, divided into three or four doses. These higher amounts are only appropriate when a doctor is monitoring you for side effects.
How Long Between Doses
The minimum gap between adult doses is four hours. For most pain, spacing doses every four to six hours works well. You don’t need to take ibuprofen on a schedule unless you’re managing a chronic condition. Take it when pain returns, and skip the dose if you feel fine.
Don’t take OTC ibuprofen for more than 10 consecutive days without talking to a doctor. If your pain hasn’t improved in that window, something else may be going on that ibuprofen won’t fix.
Doses for Children
Children’s ibuprofen is dosed by weight, not age. The standard pediatric dose is 10 mg per kilogram of body weight, given every six to eight hours as needed. The daily maximum for children is 40 mg per kg. So a child weighing 20 kg (about 44 pounds) would take 200 mg per dose and no more than 800 mg in a day.
Children should not receive more than four doses in 24 hours. Ibuprofen is not recommended for infants under six months old. For children and teens who weigh enough, the adult dose of 400 mg applies.
Who Needs a Lower Dose
Older adults face a significantly higher risk of stomach bleeding, ulcers, and kidney problems from ibuprofen. Studies show that elderly patients tolerate 600 to 1,200 mg daily reasonably well, but the guiding principle is to use the lowest dose that controls your symptoms for the shortest time possible. The risk of serious gastrointestinal complications climbs with both dose and duration.
If you have kidney disease, liver problems, or heart failure, ibuprofen can make those conditions worse. People taking blood pressure medications, particularly ACE inhibitors or certain diuretics, face additional kidney risks when adding ibuprofen. Dehydration amplifies these effects in any age group but especially in older adults and children.
Anyone with a history of stomach ulcers, especially ulcers that involved bleeding, should start at the lowest available dose or consider a different pain reliever entirely.
Where the Danger Zone Starts
Toxicity from ibuprofen follows a fairly predictable pattern based on how much you take relative to your body weight. Doses under 100 mg per kg rarely cause symptoms. For a 70 kg (154-pound) adult, that means taking less than 7,000 mg would likely not produce serious effects, though it would still be well above the recommended maximum.
Between 100 and 300 mg per kg, mild stomach and neurological symptoms appear: nausea, vomiting, drowsiness, and headache. Above 300 mg per kg, the risk of organ damage becomes real, and fatalities have been reported at these levels. For that same 70 kg adult, 300 mg per kg translates to 21,000 mg, or over 100 standard tablets.
Children are more vulnerable. Any child who has taken more than 100 mg per kg should be evaluated, even if they seem fine at first. Below that threshold, observation at home is generally sufficient unless symptoms develop.
Getting the Most From a Safe Dose
More ibuprofen does not always mean more relief. Research on pain management consistently shows that 400 mg provides the optimal balance of effectiveness and safety for most acute pain. Going to 600 or 800 mg per dose adds only marginal benefit while increasing the risk of side effects, particularly stomach irritation and kidney strain.
If 400 mg every four to six hours isn’t controlling your pain, the answer is usually not a higher dose of ibuprofen. Alternating ibuprofen with acetaminophen (taking one, then the other a few hours later) is a common strategy that provides stronger combined relief without exceeding safe limits on either drug. The two medications work through completely different mechanisms, so they complement each other well.