Adults can take Motrin (ibuprofen) every four to six hours as needed for pain or fever, with a maximum of 1,200 mg in 24 hours for over-the-counter use. That typically means no more than three doses of 400 mg per day. Children follow a different schedule, spaced every six to eight hours, with doses based on body weight.
Getting the timing right matters. Taking doses too close together raises your risk of stomach bleeding and kidney problems, while spacing them too far apart can leave you with gaps in pain relief.
Standard Adult Dosing Schedule
For general pain, headaches, or fever, the standard adult dose is 200 to 400 mg every four to six hours. Most over-the-counter Motrin tablets are 200 mg each, so that’s one to two tablets per dose. You should always use the smallest dose that controls your symptoms.
For menstrual cramps specifically, the recommended dose is 400 mg every four hours as needed, since cramp pain tends to respond better to the higher end of the dosing range taken at shorter intervals. For ongoing conditions like arthritis, doctors sometimes prescribe higher daily totals (up to 3,200 mg per day), but those doses require medical supervision and are split into three or four doses throughout the day.
Each dose starts working within 30 to 60 minutes and provides roughly four to six hours of relief. That duration lines up neatly with the dosing window: by the time one dose wears off, you’re cleared to take the next one.
Dosing for Children
Children’s Motrin is dosed by weight, not age, and the timing is more conservative than for adults. You can give a dose every six to eight hours as needed. That means a maximum of three to four doses in a 24-hour period, compared to the tighter four-hour intervals adults can use. Never give ibuprofen to an infant younger than six months without a pediatrician’s guidance.
How Long You Can Keep Taking It
The FDA label is clear on this: don’t take ibuprofen for more than 10 days for pain or more than 3 days for fever unless a doctor tells you otherwise. These aren’t arbitrary cutoffs. They reflect the point where the risks of continued use start to climb meaningfully.
If your pain or fever hasn’t resolved within those windows, something else may be going on that needs evaluation. And if your symptoms are actually getting worse while you’re taking Motrin, that’s a reason to stop and get checked sooner rather than later.
What Happens When You Take It Too Often
Ibuprofen works by blocking enzymes involved in inflammation, but those same enzymes play protective roles in your stomach lining, kidneys, and cardiovascular system. When you override them repeatedly, the consequences add up.
The stomach risk is the most immediate. Ibuprofen reduces the mucus layer that shields your stomach from its own acid, which can lead to irritation, ulcers, or bleeding. Your risk goes up if you’re over 60, drink three or more alcoholic beverages daily, or take other anti-inflammatory drugs at the same time. Warning signs include dark or bloody stools, vomiting blood, or feeling faint.
Kidney damage is the longer-term concern. Ibuprofen reduces blood flow to the kidneys, which can cause fluid retention, raise blood pressure, and gradually impair kidney function. Research published in the journal Hypertension found that using ibuprofen or similar drugs for 90 days or more was associated with a 32% increase in the risk of chronic kidney disease, with even shorter courses (under 90 days) carrying an 18% increase. People with high blood pressure or existing kidney problems are especially vulnerable.
Cardiovascular risk also rises with long-term continuous use. The FDA warns that extended ibuprofen use may increase the risk of heart attack or stroke, even in people without prior heart disease.
Taking It on an Empty Stomach
You can technically take Motrin without food, but doing so makes stomach irritation more likely. If you notice any nausea or upset, take your dose at the end of a full meal or with an antacid. This is especially important if you’re taking multiple doses per day over several days, since the cumulative effect on your stomach lining is what causes trouble.
Who Should Avoid Motrin
Some people shouldn’t take ibuprofen at all, and others need a doctor’s input before using it. The major groups to be aware of:
- People on blood thinners: Ibuprofen interferes with how platelets clump together to form clots, which is the same basic mechanism blood thinners target. Combining them significantly raises the risk of bleeding, particularly in the digestive tract.
- People with high blood pressure, heart disease, or kidney disease: Ibuprofen can raise blood pressure, cause fluid retention, and reduce kidney function. If you have any of these conditions, the risks may outweigh the benefits.
- People with a history of stomach ulcers or GI bleeding: Prior stomach problems make you much more susceptible to ibuprofen-related bleeding.
- People taking other NSAIDs: Aspirin, naproxen (Aleve), and prescription anti-inflammatories all work through similar pathways. Stacking them multiplies side effects without improving pain relief.
- People in late pregnancy: Ibuprofen during the last three months of pregnancy can cause complications for the baby and during delivery.
- Anyone about to have or recovering from heart surgery: The FDA specifically warns against ibuprofen use in this situation.
Making Each Dose Count
The simplest way to minimize risk is to follow one principle from the FDA label: use the smallest effective dose for the shortest time possible. If 200 mg handles your headache, don’t take 400. If your pain resolves after two days, don’t keep taking it for a full week “just in case.”
Spacing doses at six-hour intervals instead of four, when your pain allows it, also reduces your total daily intake. And if you find yourself reaching for Motrin most days of the week, that’s a signal to look into what’s driving the pain rather than continuing to manage it with over-the-counter medication.