Adults can take Motrin (ibuprofen) every four to six hours as needed for pain, with a maximum of 1,200 mg per day when using over-the-counter strength. Each dose is typically 200 to 400 mg, and you should wait at least four hours between doses. The specific timing depends on what you’re treating and whether you’re using it for yourself or a child.
Standard Adult Dosing Schedule
For mild to moderate pain, the standard adult dose is 400 mg every four to six hours as needed. For menstrual cramps, the interval tightens slightly to every four hours because cramping pain tends to be more persistent. In both cases, 400 mg per dose is the ceiling for over-the-counter use.
The over-the-counter daily maximum is 1,200 mg, which works out to three 400 mg doses spread across the day. Prescription doses for conditions like rheumatoid arthritis or osteoarthritis can go higher, up to 3,200 mg per day divided into three or four doses, but that range requires medical supervision and regular monitoring.
A practical way to think about it: if you take your first dose at 8 a.m., your next dose should be no earlier than noon (four hours) or as late as 2 p.m. (six hours). Spacing doses closer to six hours apart is gentler on your stomach and still effective for most types of pain.
Dosing for Children
Children’s Motrin follows a different schedule. Kids can take ibuprofen every six to eight hours, not the four-to-six-hour window that adults use. The dose itself is based on your child’s weight, not age, though age can serve as a backup if you don’t have a recent weight. Ibuprofen is not considered safe for babies under six months old, and the FDA has not approved its use in that age group.
How Long It Takes to Work
Motrin starts relieving pain within 30 to 60 minutes of taking a dose. The pain-relief effect lasts about four to six hours, which is why the dosing window matches that range. If you’re taking it for inflammation (swelling, joint stiffness), don’t expect full results right away. The anti-inflammatory effect builds gradually and can take up to one to two weeks of consistent, routine dosing to peak.
Taking Motrin with food slows absorption noticeably. Peak levels in your blood drop by 30 to 50 percent and arrive 30 to 60 minutes later than they would on an empty stomach. Your body still absorbs the full dose eventually, so the total pain relief is the same. But if you need fast relief, taking it on a lighter stomach gets it working sooner. If your stomach is sensitive, the tradeoff of slower relief for less irritation is worth it.
How Many Days in a Row Is Safe
The FDA labeling on over-the-counter ibuprofen is clear: do not take it for more than 10 consecutive days for pain unless a doctor has told you to continue. If your pain gets worse or hasn’t resolved after 10 days, that’s a signal to get evaluated rather than keep dosing.
This 10-day limit exists because the risks of ibuprofen climb with duration of use. Short courses of a few days carry relatively low risk for most people. Longer stretches start to put meaningful stress on your stomach lining, kidneys, and cardiovascular system.
Risks of Taking It Too Often
The most common side effects are stomach-related: irritation, acid reflux, and nausea. In more serious cases, ibuprofen can erode the stomach lining enough to cause ulcers. Those ulcers can bleed internally, sometimes without any warning symptoms beforehand. Rarely, a perforation (a hole in the stomach wall) can develop, which is a medical emergency.
Your kidneys are also vulnerable. Ibuprofen reduces blood flow to the kidneys, and over time this can impair their function. Warning signs include cloudy or bloody urine, a sudden drop in how much you urinate, or new swelling in your ankles. Fluid retention and sudden weight gain are related signals that the drug is affecting your kidneys or circulation.
Cardiovascular risk is real but tends to emerge with prolonged use. Regular ibuprofen use increases the chance of blood clots, heart attack, and stroke. Some studies have found this risk can appear early in treatment, but it grows the longer you take it. People who already have heart disease or high blood pressure are more susceptible. Ibuprofen can also raise blood pressure on its own in some people.
Less common but worth knowing: liver injury (watch for yellowing of the eyes), changes in hearing or ringing in the ears, and vision problems. During pregnancy, ibuprofen is not recommended after week 20 due to risks to the baby, and long-term use earlier in pregnancy may increase the chance of miscarriage.
Making Each Dose Count
If you find yourself reaching for Motrin daily, a few strategies can help you stay within safe limits. Use the lowest dose that controls your pain. Many people start at 400 mg out of habit when 200 mg would have been enough. Space your doses as far apart as your pain allows, aiming for six hours rather than four when possible. And treat it as a short-term tool: if you’re relying on it regularly beyond a week, the underlying cause of your pain likely needs its own treatment rather than ongoing symptom management.