For general pain relief, the standard adult dose of ibuprofen is 200 to 400 mg every four to six hours as needed, with a maximum of 1,200 mg per day when using over-the-counter strength. Most OTC ibuprofen tablets come in 200 mg, so that means one to two tablets per dose and no more than six tablets in 24 hours.
Standard Adult Doses by Type of Pain
The right dose depends partly on what you’re treating. For mild to moderate pain like headaches, muscle aches, or toothaches, 200 to 400 mg every four to six hours works for most adults. Menstrual cramps often respond best to 400 mg every four hours. In both cases, you should use the lowest dose that controls your pain.
For chronic inflammatory conditions like osteoarthritis or rheumatoid arthritis, doctors sometimes prescribe higher amounts, up to 3,200 mg per day split into three or four doses. That prescription range is significantly higher than what you’d take on your own and requires medical supervision because the risk of stomach and cardiovascular problems climbs with dose and duration.
How Long It Takes to Work
Ibuprofen typically starts relieving pain within 30 to 60 minutes and lasts about four to six hours per dose. If you need faster relief, taking it on an empty stomach actually speeds absorption. Despite the widespread advice to always take ibuprofen with food, there’s no strong scientific evidence that food prevents stomach irritation at OTC doses. Short-term use at 1,200 mg per day or less carries a low risk of stomach problems regardless of whether you eat first.
That said, if you’re taking higher doses (above 1,200 mg daily) or using ibuprofen for more than a few days, eating something beforehand is a reasonable precaution. High-dose ibuprofen is associated with two to three times the risk of stomach irritation compared to lower doses.
Spacing Your Doses
Always wait at least four hours between doses, and ideally four to six hours. A common mistake is redosing too soon because the pain hasn’t fully resolved. If 200 mg isn’t cutting it after an hour, it’s better to try 400 mg at your next scheduled dose than to take another 200 mg early. Stacking doses closer together increases your risk of side effects without meaningfully improving pain control.
For most short-term pain, you shouldn’t need ibuprofen for more than about seven to ten days. If your pain persists beyond that, the underlying cause likely needs attention rather than more ibuprofen.
Who Should Avoid Ibuprofen
Ibuprofen is not safe for everyone. If you’re pregnant, the FDA warns against using it at 20 weeks or later. After about 20 weeks, ibuprofen can cause kidney problems in the developing baby, which reduces the amniotic fluid that surrounds and protects them. After 30 weeks, it can also cause heart problems in the baby. These risks apply to all NSAIDs in this class, not just ibuprofen.
People with existing kidney disease, a history of stomach ulcers, or heart failure should also be cautious. Ibuprofen reduces blood flow to the kidneys and can worsen kidney function in people who are already vulnerable. If you take blood thinners or medications for high blood pressure, ibuprofen can interfere with both.
Signs You’ve Taken Too Much
Ibuprofen overdose is uncommon at recommended doses, but it’s worth knowing the warning signs. Mild overdose symptoms include nausea, vomiting, stomach pain, and heartburn. More serious signs include ringing in the ears, blurred vision, severe headache, confusion, and difficulty breathing. In extreme cases, an overdose can cause seizures, dangerously low blood pressure, very little urine output, or loss of consciousness.
If you realize you’ve accidentally doubled a dose, you’ll likely be fine, but watch for those symptoms. If you or someone else has taken a large amount intentionally or accidentally, contact poison control (1-800-222-1222 in the U.S.) or seek emergency care. The risk of serious harm increases significantly at doses well above the recommended maximum.
Quick Reference
- Single dose: 200 to 400 mg (one to two OTC tablets)
- Frequency: Every 4 to 6 hours as needed
- OTC daily max: 1,200 mg (six tablets)
- Prescription daily max: 3,200 mg (under medical supervision only)
- Onset: 30 to 60 minutes
- Duration: 4 to 6 hours per dose