The standard adult dose of Motrin (ibuprofen) is 200 to 400 mg every four to six hours as needed, with a maximum of 1,200 mg in 24 hours when using over-the-counter strength. Each OTC Motrin tablet contains 200 mg, so most adults take one to two tablets per dose. Prescription-strength ibuprofen follows different limits, going up to 3,200 mg per day under medical supervision.
OTC Dosing for Pain and Fever
For general pain, headaches, or fever, the typical starting dose is 200 mg (one tablet). If that doesn’t provide enough relief, you can take 400 mg (two tablets) per dose. Wait at least four to six hours before taking another dose, and don’t exceed three doses of 400 mg (1,200 mg total) in a single day unless a doctor has told you otherwise.
For menstrual cramps specifically, 400 mg every four hours tends to work better than the lower dose. Starting at the first sign of cramping, rather than waiting until pain builds, generally improves results. Clinical trials have found that for acute pain relief, doses higher than 400 mg at a time don’t actually work better than 400 mg. Taking more per dose just increases side effects without improving pain control.
Prescription Strength: When 200 mg Isn’t Enough
Prescription ibuprofen comes in 400 mg, 600 mg, and 800 mg tablets. These higher doses are used for conditions like rheumatoid arthritis and osteoarthritis, where ongoing inflammation needs stronger suppression. A typical prescription regimen for arthritis ranges from 1,200 to 3,200 mg per day, split into three or four doses.
The absolute ceiling is 3,200 mg in 24 hours, and even that level is reserved for serious inflammatory conditions under a doctor’s guidance. Interestingly, clinical trials showed that patients taking 3,200 mg daily didn’t consistently get better results than those taking 2,400 mg. The general principle with ibuprofen is to use the lowest dose that controls your symptoms for the shortest time you need it.
How Ibuprofen Works
Ibuprofen blocks enzymes called COX-1 and COX-2, which your body uses to produce prostaglandins. Prostaglandins are chemicals that trigger pain, swelling, and fever at the site of an injury or illness. By cutting off prostaglandin production, ibuprofen reduces all three of those symptoms at once. Unlike some newer anti-inflammatory drugs that target only COX-2, ibuprofen blocks both enzyme types, which is why it’s effective for a wide range of pain but also carries stomach-related side effects.
Protecting Your Stomach
Because ibuprofen blocks COX-1 (which helps maintain the protective lining of your stomach), it can cause irritation, nausea, or even ulcers with repeated use. The simplest way to reduce this risk is to take it at the end of a full meal rather than on an empty stomach. Taking it with an antacid also helps. If you find yourself needing ibuprofen daily for more than a few days, that’s a sign the underlying problem needs a different approach.
Who Should Be Careful
Ibuprofen affects three systems beyond pain: your stomach lining, your kidneys, and your cardiovascular system. People with a history of stomach ulcers or GI bleeding face higher risk of those problems recurring. If you have kidney disease, ibuprofen can reduce blood flow to the kidneys and make function worse. And for people with heart disease or high blood pressure, regular use may increase cardiovascular risk.
Mixing ibuprofen with blood thinners, other anti-inflammatory drugs (including aspirin), or alcohol amplifies the chance of stomach bleeding. If you take low-dose aspirin for heart protection, be aware that ibuprofen can interfere with aspirin’s ability to work. Taking the aspirin at least 30 minutes before ibuprofen helps avoid this interaction.
Quick Dosing Reference
- Mild pain or fever: 200 to 400 mg every 4 to 6 hours, up to 1,200 mg per day (OTC)
- Menstrual cramps: 400 mg every 4 hours as needed
- Arthritis (prescription): 1,200 to 3,200 mg per day, divided into 3 to 4 doses
- Minimum time between doses: 4 hours
- Best practice: Take with food or an antacid to reduce stomach irritation