Most adults can take 1 or 2 over-the-counter ibuprofen tablets (200 mg each) at a time, up to 3 times a day, with at least 4 hours between doses. That means a maximum of 6 tablets, or 1,200 mg, in 24 hours when you’re self-treating without a prescription. The right number depends on whether you’re using standard 200 mg tablets or a different strength, and whether the ibuprofen is for you or a child.
Standard Adult Dose: 200 mg Tablets
The most common over-the-counter ibuprofen tablets are 200 mg each. For general pain, headaches, or fever, the standard approach is 1 to 2 tablets every 4 to 6 hours as needed. That’s 200 to 400 mg per dose. For menstrual cramps, 2 tablets (400 mg) every 4 hours tends to work better, since cramp pain often responds to the higher end of the OTC range.
The hard ceiling for self-dosing is 6 tablets (1,200 mg) in a 24-hour period. Always wait at least 4 hours before taking the next dose, even if the pain hasn’t fully gone away.
If you’re using 400 mg tablets (sometimes sold OTC in some countries, or left over from a prescription), take just 1 tablet at a time, up to 3 times a day, for a maximum of 3 tablets in 24 hours.
Prescription Doses Are Higher
Doctors sometimes prescribe ibuprofen at much higher doses than what’s on the OTC label. Prescription-strength ibuprofen goes up to 800 mg per dose and as high as 3,200 mg per day, which is nearly three times the OTC daily limit. These higher doses are used for conditions like severe arthritis or ongoing inflammatory pain, and they come with closer medical monitoring. Don’t take prescription-level amounts on your own just because lower doses aren’t cutting it.
Dosing for Children
Children’s ibuprofen dosing is based on weight, not age. Age is only a backup if you don’t know the child’s weight. Children can take ibuprofen every 6 to 8 hours as needed, which is a longer gap between doses than adults typically use.
Ibuprofen is not considered safe for babies under 6 months old. For older infants and children, always use the measuring device that comes with the product and follow the weight-based chart on the packaging.
One important detail: infant drops and children’s liquid ibuprofen have different concentrations. Infant drops contain 50 mg per 1.25 mL, while children’s liquid contains 100 mg per 5 mL. The infant version is more than twice as concentrated drop for drop. Mixing them up can lead to giving a child too much or too little, so always check which product you have before measuring a dose.
Take It With Food
Ibuprofen is easiest on your stomach when you take it with or right after food. Swallow tablets whole with a full glass of water. Taking it on an empty stomach won’t make the medicine stop working, but it increases the chance of stomach irritation, nausea, or heartburn, especially if you’re taking it for more than a day or two.
Who Should Take Less or Avoid It Entirely
Ibuprofen is not equally safe for everyone. Several common health situations change the math on whether you should take it at all, or how much is appropriate.
Your stomach and digestive tract face the most direct risk. Ibuprofen can cause ulcers, internal bleeding, or holes in the stomach lining. These problems are more likely if you’re older, take ibuprofen regularly over weeks or months, smoke, or drink alcohol frequently while using it. If you have a history of stomach ulcers or gastrointestinal bleeding, ibuprofen may not be a good choice for you.
Heart risk also increases with ibuprofen use, particularly at higher doses or over long periods. People with existing heart disease, a history of heart attack or stroke, high blood pressure, high cholesterol, or diabetes should be especially cautious. If you’ve recently had a heart attack, ibuprofen is generally off the table unless a doctor specifically tells you otherwise.
Other conditions that warrant caution include asthma (particularly if you also have nasal polyps), kidney disease, liver disease, lupus, and heart failure. Pregnancy after 20 weeks is another clear reason to avoid ibuprofen, as it can harm the fetus and cause complications during delivery.
Medications That Don’t Mix Well
Ibuprofen interacts with several widely used medications. Blood thinners are the most notable: combining them with ibuprofen raises bleeding risk significantly. Aspirin and other anti-inflammatory painkillers like naproxen (Aleve) overlap with ibuprofen’s effects, so taking them together increases the chance of stomach damage without much added benefit.
Common antidepressants, including SSRIs like sertraline (Zoloft) and fluoxetine (Prozac), also interact with ibuprofen by independently increasing bleeding risk. Oral steroids like prednisone compound the stomach-related dangers. If you take any of these medications regularly, talk to a pharmacist or doctor before adding ibuprofen to the mix.
Signs You’ve Taken Too Much
Ibuprofen overdose symptoms span multiple body systems. Early signs often include stomach pain, nausea, vomiting, and heartburn. More serious symptoms include ringing in the ears, blurred vision, severe headache, difficulty breathing, and confusion. In severe cases, overdose can lead to very low blood pressure, seizures, minimal urine output (a sign of kidney shutdown), or loss of consciousness.
If you suspect an overdose, call 911 or the Poison Help hotline at 1-800-222-1222. This applies even if the person seems mostly fine, since some serious effects develop over hours rather than immediately.