For adults, the standard single dose of ibuprofen is 200 to 400 milligrams, which means 1 to 2 over-the-counter tablets (each tablet is typically 200 mg). Most OTC labels recommend taking 1 tablet and going up to 2 if the first doesn’t provide enough relief, with a maximum of 3 tablets (600 mg) in a single OTC dose only under a doctor’s direction. The total daily limit for OTC use is 1,200 mg, or 6 tablets, spread across the day.
Single Dose Limits for Adults
The recommended single dose for mild to moderate pain is 400 mg every four to six hours as needed. That’s 2 standard OTC tablets. For menstrual cramps, the same 400 mg dose applies, but the interval shortens to every four hours. In either case, you should use the lowest effective dose, meaning if one 200 mg tablet handles your headache, there’s no benefit to doubling it.
Prescription ibuprofen goes higher. For conditions like rheumatoid arthritis or osteoarthritis, doctors sometimes prescribe up to 800 mg per dose (typically available as a single 800 mg prescription tablet), with daily totals reaching 3,200 mg. But these higher doses come with closer medical monitoring and are intended for chronic inflammatory conditions, not occasional aches.
Why More Pills Don’t Mean More Relief
Ibuprofen works by blocking enzymes that produce inflammation and pain signals. Once you’ve taken enough to fully block those enzymes, additional ibuprofen has nowhere to go in terms of pain relief. It just circulates in your blood and gets processed by your kidneys and liver. Taking 3 or 4 OTC tablets at once won’t kill a headache faster than 2 tablets will. The extra milligrams only increase side effects without adding meaningful benefit for acute pain.
Ibuprofen typically starts working within 30 to 60 minutes. If your pain hasn’t improved after an hour, the answer is usually to try a different approach (a cold compress, rest, or a different type of pain reliever) rather than taking more ibuprofen on top of what you’ve already taken.
How to Space Your Doses
Wait at least four to six hours between doses. A common mistake is re-dosing too early because the pain returns before the next dose window opens. If 400 mg wears off after three hours, that doesn’t mean you should take more at the three-hour mark. Shortening the interval pushes your daily total higher and increases the strain on your stomach lining and kidneys.
For OTC use, don’t exceed 1,200 mg (six 200 mg tablets) in 24 hours. A practical way to think about it: 2 tablets, three times a day, spaced at least four to six hours apart. If you find yourself needing ibuprofen at that maximum dose for more than a few days, the underlying problem likely needs professional attention rather than more pain relief.
Doses for Children
Children’s ibuprofen is dosed by weight, not age. Age is only a backup if you don’t know the child’s weight. The dose can be repeated every 6 to 8 hours (longer intervals than adults). Ibuprofen should not be given to infants younger than 6 months, as it hasn’t been established as safe for that age group. Children’s formulations come as liquid suspensions and chewable tablets with lower milligram amounts, so always check the concentration on the label rather than guessing based on adult tablets.
What Happens If You Take Too Much
An ibuprofen overdose can affect multiple systems at once. Early signs tend to be digestive: nausea, vomiting, stomach pain, and diarrhea. More concerning symptoms include ringing in the ears, blurred vision, severe headache, and confusion. In serious cases, breathing slows, blood pressure drops, urine output decreases sharply (a sign the kidneys are shutting down), and seizures or loss of consciousness can occur.
The stomach and intestinal lining are particularly vulnerable. Ibuprofen reduces the protective mucus layer in your gut, and at high doses, this can cause internal bleeding. You might notice dark or tarry stools, or vomit that looks like coffee grounds. These are signs of GI bleeding and need immediate medical attention.
Who Should Be Extra Careful
Even standard doses carry more risk for certain people. If you have reduced kidney function, heart disease, or high blood pressure, ibuprofen can worsen those conditions. The National Kidney Foundation specifically warns that people with low kidney function should avoid NSAIDs like ibuprofen unless directed otherwise by a doctor. High doses or long-term use can damage healthy kidneys too, but existing kidney problems lower the threshold for harm considerably.
Alcohol amplifies ibuprofen’s effect on the stomach lining. If you’ve been drinking, even a normal dose raises the risk of irritation and bleeding. People over 60, those with a history of stomach ulcers, and anyone taking blood thinners also face elevated risks at doses that would be perfectly fine for a healthy 30-year-old.
The Short Version
For most adults with occasional pain: take 1 to 2 tablets (200 to 400 mg), wait at least 4 to 6 hours before taking more, and don’t exceed 6 tablets (1,200 mg) in a day without medical guidance. If that isn’t controlling your pain, the solution isn’t more ibuprofen.