For most adults, the standard single dose of ibuprofen is 200 to 400 mg at a time. The 400 mg dose (two over-the-counter tablets) is the most commonly recommended single dose for pain, fever, and menstrual cramps. You can repeat that dose every four to six hours as needed, but you should not exceed six doses in a 24-hour period.
Standard Single Dose for Adults
Over-the-counter ibuprofen tablets typically come in 200 mg strength. For mild to moderate pain, the standard adult dose is 200 to 400 mg, which means one or two tablets. Starting with 200 mg is reasonable for minor aches, but 400 mg is the go-to dose for stronger pain like headaches, muscle soreness, or menstrual cramps.
Prescription ibuprofen can go higher. Doctors sometimes prescribe 600 mg or even 800 mg per dose for conditions like arthritis or severe inflammation. But those larger doses come with more side effects and are meant to be used under medical supervision, not as a self-treatment choice.
How Often You Can Take It
At the 400 mg dose, you should wait at least four to six hours before taking more. Adults and anyone over 12 should not take more than six doses in 24 hours. That puts the practical over-the-counter ceiling at about 1,200 mg per day if you’re dosing conservatively, though the label on most bottles lists 1,200 mg as the daily maximum for self-care use.
Prescription doses can push the daily total to 2,400 or even 3,200 mg under a doctor’s guidance, but these levels carry a meaningfully higher risk of stomach, kidney, and cardiovascular problems. For self-treatment, staying at or below 1,200 mg per day and using the lowest effective dose for the shortest time is the safest approach.
What Happens If You Take Too Much
Ibuprofen has a relatively wide safety margin compared to some other pain relievers. In a study of 126 overdose cases, no patients who ingested less than 99 mg per kilogram of body weight developed any symptoms. For a 70 kg (154 lb) adult, that translates to roughly 6,900 mg, far above any recommended dose. This doesn’t mean large doses are safe to experiment with. It means that accidentally taking an extra tablet is unlikely to cause serious harm.
When overdose symptoms do appear, they include nausea, vomiting, stomach pain, drowsiness, blurred vision, and in severe cases, seizures, dangerously low blood pressure, and kidney problems. In the same study, 47% of adults who took overdose-level amounts developed symptoms. The risks are real at high enough quantities, especially with repeated large doses over days or weeks rather than a single accidental extra pill.
Who Should Take Less
Not everyone can safely take the standard 400 mg dose. If you have a history of stomach ulcers or gastrointestinal bleeding, ibuprofen can reopen or worsen those problems because it reduces the protective lining of the stomach. People with kidney disease are also at higher risk, since ibuprofen reduces blood flow to the kidneys and can accelerate damage that’s already underway. Heart disease and high blood pressure are additional concerns, as all anti-inflammatory painkillers in this class can raise cardiovascular risk with regular use.
If you take low-dose aspirin for heart protection, ibuprofen can interfere with aspirin’s ability to prevent blood clots. The FDA has noted that taking them at the same time may reduce aspirin’s heart benefits. If you need both, timing matters: taking ibuprofen at least 30 minutes after or 8 hours before your aspirin dose can help avoid the interaction.
Dosing for Children
Children’s doses are based on weight, not age, though age can serve as a rough guide if you don’t have a scale handy. The standard pediatric dose is 10 mg per kilogram of body weight, given every six to eight hours, with a maximum of four doses in 24 hours. A 20 kg (44 lb) child, for example, would take 200 mg per dose.
Ibuprofen should not be given to babies under 6 months old. It hasn’t been established as safe for that age group, and the FDA has not approved its use in infants that young. Once children reach the adult transition point (generally over 12 years old or around 88 pounds), the standard adult dose of 200 to 400 mg applies.
Keeping the Dose as Low as Possible
The safest strategy with ibuprofen is to take the smallest amount that actually relieves your symptoms. If 200 mg handles your headache, there’s no benefit to taking 400 mg. If you only need it for one afternoon, don’t keep dosing around the clock for days. The risks of ibuprofen, particularly stomach irritation, kidney strain, and cardiovascular effects, scale with both dose size and duration of use. Taking it with food or a full glass of water can also reduce the chance of stomach upset, which is the most common side effect even at normal doses.