The maximum over-the-counter dose of ibuprofen for adults is 1,200 mg per day, which works out to three 400 mg doses or six 200 mg tablets. Under a doctor’s supervision, the prescription limit goes higher, up to 3,200 mg per day for conditions like rheumatoid arthritis or osteoarthritis. That prescription dose is divided into three or four equal doses spread throughout the day.
OTC vs. Prescription Limits
When you buy ibuprofen off the shelf, each tablet is typically 200 mg. The standard single dose is 200 to 400 mg, taken every four to six hours as needed, with a hard ceiling of 1,200 mg in 24 hours. You should use the smallest dose that relieves your symptoms.
Prescription-strength ibuprofen allows for significantly more. For inflammatory conditions like osteoarthritis, doctors may prescribe 1,200 to 3,200 mg per day, split into three or four doses. That upper range is nearly triple the OTC cap, which is why it requires medical oversight and regular check-ins to monitor for side effects.
How Long You Can Safely Take It
For self-treated pain, the guideline is no more than 10 consecutive days. For fever, the window is shorter: three days. If you still need ibuprofen after those limits, that’s a signal to check in with a provider rather than keep going on your own. The risk of stomach bleeding, kidney strain, and cardiovascular problems climbs the longer you take it, especially at higher doses.
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 recent weight. Ibuprofen can be given every six to eight hours as needed. It is not recommended for infants younger than six months. For children older than six months, the correct dose varies enough by weight that you should follow the dosing chart on the product label or one provided by your pediatrician rather than estimating.
What Happens If You Take Too Much
Taking more than the recommended dose doesn’t provide better pain relief. It does, however, increase the chance of side effects. At moderately excessive doses, the most common problems are stomach pain, nausea, vomiting, and heartburn. Ibuprofen can irritate the stomach lining and, over time or at high doses, cause bleeding in the stomach or intestines.
A true overdose brings more serious symptoms: ringing in the ears, blurred vision, confusion, difficulty breathing, and very little urine output (a sign your kidneys are struggling). In severe cases, seizures and loss of consciousness can occur. Recovery is likely with prompt treatment, but large overdoses can cause lasting kidney or liver damage.
Who Should Use a Lower Dose or Avoid It
Several conditions change the calculus on ibuprofen, even at standard OTC doses. If you have a history of stomach ulcers or gastrointestinal bleeding, ibuprofen increases the risk of a recurrence. People with kidney disease are especially vulnerable because ibuprofen reduces blood flow to the kidneys, which can worsen existing damage.
Heart health matters too. Ibuprofen raises cardiovascular risk slightly, and that effect is more meaningful if you already have heart disease, high blood pressure, high cholesterol, or a history of heart attack or stroke. If you’ve recently had a heart attack or are about to undergo heart surgery, ibuprofen should be off the table entirely unless a doctor specifically tells you otherwise.
Other situations that call for extra caution: asthma (particularly if you also have nasal polyps), liver disease, lupus, current use of blood thinners or other NSAIDs like aspirin or naproxen, and being 75 or older. In all these cases, the standard maximum may be too high for you, and a provider can help identify a safer dose or an alternative.
Practical Tips for Staying in Range
The simplest rule is to start low. If one 200 mg tablet handles your headache, there’s no reason to take two. Space doses at least four to six hours apart and keep a mental tally of what you’ve taken that day, especially if you’re also using combination cold or flu products that sometimes contain ibuprofen as an ingredient.
Taking ibuprofen with food or a full glass of water reduces the chance of stomach irritation. If you find yourself reaching for it daily, that’s worth paying attention to. Chronic pain that requires daily ibuprofen for more than a week or two is better managed with a plan from your doctor, who can monitor for the kidney, stomach, and heart risks that accumulate with regular use.