For adults buying Motrin (ibuprofen) over the counter, the standard dose is 200 to 400 mg every four to six hours, with a maximum of 1,200 mg in 24 hours. That’s the ceiling for self-treating without a doctor’s guidance. Under a doctor’s supervision, prescription doses can go higher, up to 3,200 mg per day for conditions like rheumatoid arthritis.
Standard Adult Doses
Over-the-counter Motrin comes in 200 mg tablets. For general pain or fever, you can take one to two tablets (200 to 400 mg) every four to six hours as needed. The key limit: no more than three doses of 400 mg in 24 hours, which totals 1,200 mg. If you’re using it for menstrual cramps, the same 400 mg dose every four hours applies, but you should still stay within that daily cap unless your doctor says otherwise.
Prescription ibuprofen is a different story. For chronic inflammatory conditions like osteoarthritis, doctors sometimes prescribe 1,200 to 3,200 mg per day, split into three or four doses throughout the day. These higher amounts require medical monitoring because the risks increase significantly with dose and duration.
How Long to Wait Between Doses
The minimum gap between doses is four hours, though spacing them every six hours is gentler on your stomach and kidneys. Taking doses closer together than four hours causes the drug to accumulate faster than your body can process it, raising the risk of side effects. If one dose isn’t controlling your pain, taking the next one sooner won’t help and will only increase your exposure.
Dosing for Children
Children’s Motrin is dosed by weight, not age, and comes in liquid form for younger kids. You can give ibuprofen every six to eight hours as needed, but not to any child under six months old. For children who have been vomiting, having diarrhea, or not drinking enough fluids, ibuprofen can be harder on the kidneys, so talk to a pediatrician before giving it. Always use the measuring device that comes with the product rather than a kitchen spoon.
Take It With Food
Ibuprofen works by blocking substances in your body that cause inflammation and pain, but those same substances also help protect your stomach lining. Taking Motrin on an empty stomach makes irritation, heartburn, and even ulcers more likely. Eating something before your dose, even a small snack, provides a buffer. This matters more the longer you use it: people who take ibuprofen regularly for days or weeks face a meaningfully higher risk of stomach bleeding than those who take it occasionally.
Who Should Avoid or Limit Motrin
Several conditions change the math on ibuprofen safety:
- Heart disease or recent heart attack. Ibuprofen and other NSAIDs raise the risk of heart attack and stroke. The risk increases with higher doses and longer use.
- Stomach ulcers or GI bleeding. If you’ve had ulcers or intestinal bleeding, ibuprofen can reactivate or worsen them.
- Kidney or liver disease. Your kidneys process ibuprofen, and the drug reduces blood flow to them. Existing kidney problems make this effect dangerous.
- Pregnancy at 20 weeks or later. Ibuprofen can harm fetal development and cause delivery complications in the second half of pregnancy.
- Age 75 and older. Older adults are more vulnerable to stomach bleeding, kidney problems, and cardiovascular effects at standard doses.
- Asthma with nasal polyps. This combination significantly increases the chance of a severe allergic reaction to ibuprofen.
Smoking and heavy alcohol use also raise the risk of stomach bleeding when combined with ibuprofen.
Interactions With Other Medications
If you take low-dose aspirin (81 mg daily) for heart protection, ibuprofen can interfere with aspirin’s ability to prevent blood clots. This isn’t a minor interaction. The FDA has warned that regular ibuprofen use can essentially cancel out aspirin’s cardioprotective effect. Other over-the-counter pain relievers in the same drug class, like naproxen (Aleve), may cause the same problem. If you rely on daily aspirin for your heart, talk to your doctor before using Motrin regularly.
Signs You’ve Taken Too Much
Ibuprofen overdose symptoms range from uncomfortable to dangerous. Mild overdose typically causes nausea, vomiting, stomach pain, and heartburn. More serious cases can produce ringing in the ears, blurred vision, severe headache, confusion, and difficulty breathing. In extreme overdoses, seizures, very low blood pressure, and loss of consciousness are possible. Kidney function can also shut down, showing up as producing little or no urine.
If you or someone else has taken significantly more than the recommended amount, call Poison Control at 1-800-222-1222 or 911. Don’t wait for symptoms to appear, because some effects like kidney damage develop quietly.