Adults can take 200 to 400 mg of Motrin (ibuprofen) every four to six hours as needed, with a maximum of 1,200 mg in 24 hours for over-the-counter use. A doctor may prescribe higher doses for specific conditions, but you should never exceed the OTC limit on your own.
Standard OTC Dosing
Each regular-strength Motrin tablet contains 200 mg of ibuprofen. For most types of pain, the standard adult dose is 200 to 400 mg (one to two tablets) every four to six hours. The key rule: don’t take more than three doses of 400 mg, totaling 1,200 mg, in a single day unless a doctor has specifically told you otherwise.
For menstrual cramps, the dosing is slightly different. The recommended amount is 400 mg every four hours as needed, though the same daily ceiling of 1,200 mg still applies for self-directed use. Taking the full 400 mg dose at the start of cramps tends to work better than starting with a lower dose and working up.
Prescription Doses Are Higher
Doctors sometimes prescribe ibuprofen at doses up to 3,200 mg per day for conditions like rheumatoid arthritis or severe inflammation. These higher doses require medical supervision because the risk of side effects rises significantly with the amount you take and how long you take it. The 1,200 mg OTC cap exists specifically because that’s the threshold where most adults can use ibuprofen safely without monitoring.
How Quickly It Works
Pain relief from ibuprofen typically kicks in within 30 to 60 minutes and lasts about four to six hours per dose. If you’re not getting adequate relief within that window at 400 mg, taking more won’t necessarily help and increases your risk of side effects. Switching to a different type of pain reliever or combining ibuprofen with acetaminophen (which works through a different pathway) is generally a better strategy than exceeding the recommended dose.
Stomach and Digestive Risks
Ibuprofen works by blocking the production of chemicals called prostaglandins that trigger pain and inflammation. The problem is that those same chemicals also protect the lining of your stomach. Without that protection, ibuprofen can cause ulcers, bleeding, or even holes in the stomach or intestinal wall. These complications can develop without warning symptoms and become serious quickly.
Your risk is higher if you’re over 60, take ibuprofen regularly over weeks or months, smoke, or drink alcohol while using it. Taking it with food or a full glass of water can help reduce stomach irritation, though it won’t eliminate the risk entirely. Stop taking ibuprofen if you notice stomach pain, heartburn, dark or tarry stools, or vomit that looks like coffee grounds.
Heart and Kidney Concerns
Regular ibuprofen use, particularly at higher doses, is associated with an increased risk of heart attack and stroke. This applies even to people with no prior heart problems, though the risk is greater if you have high blood pressure, high cholesterol, diabetes, or a smoking habit. If you’ve recently had a heart attack or are scheduled for heart surgery, ibuprofen is not safe to use.
Your kidneys are also vulnerable. Ibuprofen reduces blood flow to the kidneys, which can cause damage over time or worsen existing kidney disease. Warning signs include producing very little urine, back pain, painful urination, or cloudy or bloody urine.
Dangerous Combinations
Ibuprofen interacts badly with blood thinners. Research published in Circulation found that people taking both an anticoagulant and an NSAID like ibuprofen had roughly 60 to 70 percent higher rates of significant bleeding events. Ibuprofen interferes with platelet function on its own, and layering that on top of a blood thinner creates a compounding effect.
Other medications to be cautious with include corticosteroids (which also increase stomach bleeding risk), other NSAIDs like naproxen or aspirin (doubling up amplifies every side effect), and certain blood pressure medications, whose effectiveness ibuprofen can reduce.
Signs of an Overdose
Taking too much ibuprofen can affect multiple systems in the body. Early symptoms often include severe stomach pain, nausea, vomiting, and heartburn. As severity increases, you may experience ringing in the ears, blurred vision, severe headache, confusion, or difficulty breathing. In serious cases, overdose can lead to seizures, dangerously low blood pressure, kidney failure (marked by producing little or no urine), or loss of consciousness.
If you suspect someone has taken too much ibuprofen, call 911 or the Poison Help hotline at 1-800-222-1222. Don’t wait for severe symptoms to appear before calling.
How to Use Motrin Safely
Use the lowest effective dose for the shortest period that handles your pain. If 200 mg works, there’s no benefit to taking 400 mg. If you need ibuprofen for more than 10 consecutive days, that’s a signal to talk to a doctor about what’s causing your pain rather than continuing to manage it on your own. Long-term use is where the most serious risks, from stomach bleeding to cardiovascular events, begin to accumulate.