For over-the-counter use, adults can take up to 3 tablets of Motrin (200 mg each) every 6 to 8 hours, with a maximum of 1,200 mg (6 tablets) in 24 hours. That limit applies to standard Motrin bought off the shelf. Prescription-strength ibuprofen, the active ingredient in Motrin, can go higher under medical supervision, but the rules change significantly.
OTC Dosing for Adults
Each standard Motrin tablet contains 200 mg of ibuprofen. For general pain or fever, the recommended dose is 200 to 400 mg every 4 to 6 hours as needed. The key constraint is the daily ceiling: no more than 1,200 mg in a 24-hour period when you’re self-treating. That works out to 6 regular-strength tablets spread across the day.
For menstrual cramps specifically, the dosing is slightly different. You can take 400 mg (2 tablets) every 4 hours as needed, but the same 1,200 mg daily cap still applies for OTC use. Taking the full 400 mg dose up front tends to work better for cramp pain than starting with a single tablet.
Spacing matters just as much as the total count. Wait at least 4 hours between doses, and ideally 6 to 8 hours. Taking doses too close together increases the risk of stomach irritation, even if you stay under the daily limit.
Prescription Doses Are Higher
For conditions like rheumatoid arthritis or osteoarthritis, doctors sometimes prescribe ibuprofen at doses ranging from 1,200 mg up to 3,200 mg per day, divided into 3 or 4 doses. That upper end is nearly three times the OTC limit. These higher doses are only appropriate under medical supervision because the risk of side effects, particularly to the stomach and kidneys, increases significantly at those levels.
If you find that 1,200 mg per day isn’t controlling your pain, that’s a signal to talk to a doctor rather than simply taking more on your own.
Dosing for Children
Children’s Motrin is dosed by weight, not by a fixed number of tablets. You can give a dose every 6 to 8 hours as needed, using the dosing chart on the package that matches your child’s weight. If you don’t know your child’s weight, the chart also lists age-based guidelines as a backup.
Ibuprofen should not be given to babies under 6 months old. It hasn’t been established as safe in that age group, and the FDA has not approved its use for infants that young.
What Happens If You Take Too Much
An ibuprofen overdose can affect multiple systems in your body. Early warning signs include severe stomach pain, nausea, vomiting, and heartburn. As toxicity increases, symptoms can escalate to ringing in the ears, blurred vision, confusion, difficulty breathing, and very little urine output. In serious cases, seizures and loss of consciousness are possible.
Even without a single large overdose, consistently exceeding the recommended dose over days or weeks creates its own problems. Chronic overuse is particularly hard on the kidneys and the lining of the stomach.
Kidney and Stomach Risks
Ibuprofen works by blocking inflammation, but it also reduces blood flow to the kidneys as a side effect. At recommended doses and short durations, healthy kidneys handle this fine. At high doses or with prolonged daily use, the reduced blood flow can damage kidney tissue. The National Kidney Foundation warns that even people with healthy kidneys can develop kidney problems from taking high doses over a long period.
If you already have reduced kidney function, heart disease, or high blood pressure, ibuprofen carries extra risk. People with these conditions should generally avoid it unless specifically directed otherwise by a doctor.
Stomach bleeding is the other major concern. Ibuprofen thins the protective mucus layer in your stomach, and higher doses or longer use increase the chance of ulcers or internal bleeding. Taking it with food doesn’t eliminate this risk, but it can reduce the stomach irritation you feel.
Interactions to Watch For
If you take low-dose aspirin to protect your heart, ibuprofen can interfere with aspirin’s blood-thinning effect. The FDA has flagged this specifically: taking ibuprofen alongside daily aspirin therapy may reduce the cardiovascular benefit of the aspirin. If you need both, timing them carefully (taking aspirin first, then waiting) can help, but this is worth discussing with a pharmacist or doctor.
Combining Motrin with other anti-inflammatory drugs like naproxen (Aleve) stacks the same type of risk, increasing the likelihood of stomach and kidney problems without providing meaningfully better pain relief.
Pregnancy Restrictions
The FDA recommends avoiding ibuprofen and all similar anti-inflammatory drugs from 20 weeks of pregnancy onward. After that point, these medications can cause kidney problems in the developing baby, leading to dangerously low levels of amniotic fluid. After 30 weeks, the risk increases further because ibuprofen can cause premature closure of a blood vessel in the baby’s heart that needs to stay open until birth.
If ibuprofen is deemed necessary between weeks 20 and 30, the guidance is to use the lowest effective dose for the shortest possible time, ideally no longer than 48 hours.
How Long You Can Keep Taking It
The OTC label recommends not using ibuprofen for more than 10 consecutive days for pain, or 3 days for fever, without medical guidance. These aren’t arbitrary numbers. Beyond that window, the cumulative effect on your stomach lining and kidneys starts to become a real concern, even at standard doses. If your pain persists past that point, the underlying cause likely needs attention rather than more Motrin.