For adults buying ibuprofen over the counter, the maximum is 1,200 mg per day, which works out to six 200 mg tablets. Under a doctor’s supervision, the prescription ceiling is 3,200 mg per day. The difference matters because higher doses carry significantly greater risks to your stomach, kidneys, and cardiovascular system.
OTC Limits for Adults
A standard over-the-counter ibuprofen tablet is 200 mg. The recommended dose is one to two tablets (200 to 400 mg) every four to six hours, with a hard cap of six tablets (1,200 mg) in any 24-hour period. The NHS guidelines line up with this: if you’re taking 400 mg tablets, you should take no more than three in 24 hours, which again equals 1,200 mg.
Always leave at least four to six hours between doses, even if the pain returns sooner. Taking doses closer together doesn’t improve pain relief and increases your risk of side effects. If 1,200 mg per day isn’t controlling your pain, that’s a signal to talk to a healthcare provider rather than increase the dose on your own.
Prescription Doses Go Higher
For conditions like rheumatoid arthritis or osteoarthritis, doctors sometimes prescribe ibuprofen at doses between 1,200 and 3,200 mg per day, split into three or four doses. The absolute ceiling, per FDA-approved labeling, is 3,200 mg total in 24 hours. These higher doses are only appropriate under medical supervision, with periodic monitoring of kidney function, blood pressure, and stomach health.
How Long You Can Take It
Over-the-counter packaging generally advises limiting use to 10 consecutive days for pain (or three days for fever) before checking with a provider. Ibuprofen is designed for short-term flare-ups, not ongoing daily use. Long-term use, even at standard doses, raises the likelihood of stomach ulcers, kidney problems, and cardiovascular events. The longer you take it and the higher the dose, the more those risks compound.
Dosing for Children
Children’s ibuprofen is dosed by weight, not age. It should not be given to infants under six months old. The standard dose is repeated every six to eight hours as needed, and it’s important to use the measuring device that comes with the product rather than a kitchen spoon.
Here’s a simplified breakdown by weight:
- 12 to 17 lbs: 50 mg per dose
- 18 to 23 lbs: 75 mg per dose
- 24 to 35 lbs: 100 mg per dose
- 36 to 47 lbs: 150 mg per dose
- 48 to 59 lbs: 200 mg per dose
- 60 to 71 lbs: 250 mg per dose
- 72 to 95 lbs: 300 mg per dose
- 96+ lbs: 400 mg per dose
Children who weigh 96 pounds or more can typically take adult 200 mg tablets, two at a time. For younger or lighter children, liquid formulations make it easier to measure the right amount.
Who Needs a Lower Limit
Certain people face higher risks from ibuprofen even at standard doses. Ibuprofen reduces blood flow to the kidneys, which is normally harmless in a healthy person but can cause real damage if your kidneys are already compromised. The National Kidney Foundation specifically flags ibuprofen (along with naproxen and high-dose aspirin) as a concern for anyone with chronic kidney disease, particularly at high doses or with long-term use.
Other groups who should use the lowest effective dose for the shortest time possible include people with a history of stomach ulcers or gastrointestinal bleeding, anyone with heart disease or high blood pressure, and adults over 65. Older adults are more vulnerable to stomach bleeding and kidney injury from ibuprofen, even though no formal lower dose limit is published for this age group. Starting with a single 200 mg tablet and seeing whether that’s sufficient is a practical approach.
Don’t Stack It With Other NSAIDs
Ibuprofen belongs to a class of drugs called NSAIDs, which also includes naproxen and aspirin. Taking two NSAIDs at the same time doesn’t double the pain relief. It doubles the risk of stomach bleeding and kidney stress. If you’re already taking naproxen, adding ibuprofen on top doesn’t give you a separate 1,200 mg allowance. You’re stacking the same type of drug.
There’s a specific concern with aspirin. If you take low-dose aspirin daily to protect against heart attack, ibuprofen can interfere with aspirin’s ability to prevent blood clots. The FDA notes that both can be used, but the timing matters. Taking ibuprofen before or at the same time as aspirin can block aspirin’s heart-protective effect. If this applies to you, spacing the two medications appropriately (typically taking aspirin first, then waiting) can help preserve aspirin’s benefit.
Signs You’ve Taken Too Much
Ibuprofen overdose can affect multiple organ systems. Mild cases often start with nausea, vomiting, stomach pain, and heartburn. As severity increases, symptoms can include ringing in the ears, blurred vision, severe headache, confusion, and difficulty breathing. In serious overdoses, kidney function can shut down (marked by very little urine output), blood pressure can drop dangerously, and seizures or loss of consciousness can occur.
Chronic overuse, even without a dramatic single overdose, can quietly damage the kidneys and liver over time. This is particularly risky because the early stages produce no obvious symptoms. By the time you feel something is wrong, the damage may already be significant.
If you suspect an overdose, contact Poison Control (1-800-222-1222 in the U.S.) or call emergency services. Don’t wait for symptoms to appear, as early treatment leads to better outcomes.