Adults can take Motrin (ibuprofen) every 4 to 6 hours as needed for pain, with a maximum of 1,200 mg in 24 hours when using over-the-counter strength. The key phrase is “as needed.” You don’t need to dose on a strict schedule, and taking the smallest effective amount for the shortest time keeps your risk of side effects low.
Standard Adult Dosing Schedule
For mild to moderate pain, the standard adult dose is 400 mg (two over-the-counter 200 mg tablets) every 4 to 6 hours. For menstrual cramps, the interval tightens slightly: 400 mg every 4 hours, starting at the earliest onset of pain. In both cases, you should not exceed 1,200 mg (six 200 mg tablets) in a single day.
If you’re taking 400 mg tablets (prescription strength), the limit is three tablets in 24 hours, still spaced at least 4 hours apart. The important rule is simple: always wait a minimum of 4 hours between doses, regardless of the tablet strength you’re using.
How Long Each Dose Lasts
Motrin is absorbed quickly. Blood levels peak about 1 to 2 hours after you take it, which is when you’ll feel the strongest relief. The active ingredient clears your system with a half-life of roughly 2 hours, meaning the pain-relieving effect typically fades within 4 to 6 hours. That’s why the dosing window matches that timeframe.
If your pain returns before the 4-hour mark, don’t take another dose early. Instead, consider whether you need a different approach or a stronger pain management plan.
How Many Days in a Row Is Safe
Over-the-counter Motrin is meant for short-term use. Most guidelines recommend no more than 3 consecutive days without talking to a healthcare provider. Serious side effects, including stomach bleeding and cardiovascular problems, can begin as early as the first few weeks of daily use, and the risk climbs the longer you take it. If you’re still reaching for Motrin after 3 days, the underlying issue likely needs a different solution.
Dosing for Children
Children’s Motrin follows different rules. Kids can take ibuprofen every 6 to 8 hours (not every 4 hours like adults), and the dose is based on weight rather than age. If you don’t know your child’s weight, age can serve as a rough guide, but weight is more accurate. Ibuprofen should not be given to infants younger than 6 months old unless specifically directed by a pediatrician, because it hasn’t been established as safe for that age group.
Alternating With Acetaminophen
If Motrin alone isn’t controlling pain or fever, you can alternate it with acetaminophen (Tylenol). The approach works like this: take one, then wait 4 to 6 hours and take the other. You can continue alternating every 3 to 4 hours throughout the day. Don’t take both at the same time.
When alternating, keep a running total of each drug separately. Adults and teens over 12 should stay under 1,200 mg of ibuprofen and 4,000 mg of acetaminophen per day. For children under 12, check with a pediatrician for weight-appropriate doses before starting this rotation. And if you’re alternating consistently for more than 3 days, that’s a signal to get professional guidance.
Take It With Food and Water
Ibuprofen can irritate the stomach lining, especially on an empty stomach. Swallow your dose with a full glass of water, ideally with or just after a meal or snack. This doesn’t change how well the drug works, but it does reduce the chance of nausea and stomach discomfort. If you’re prone to heartburn or have a sensitive stomach, this step matters even more with repeated doses.
Who Should Be More Cautious
Ibuprofen raises the risk of heart attack and stroke in both people with and without heart disease, though the risk is significantly higher for those who already have cardiovascular problems. If you have heart disease, the safest approach is to avoid ibuprofen when possible. When you do need it, the lowest dose for the shortest duration is the guiding principle.
If you take daily aspirin to prevent heart attacks, be aware that ibuprofen can interfere with aspirin’s protective effect. Timing matters here, and it’s worth discussing the specifics with a pharmacist or physician.
Older adults face compounded risks because kidney function, stomach lining integrity, and cardiovascular health all tend to decline with age. For this group, even occasional use deserves more careful consideration of the dose and frequency.