For most adults, the standard single dose of ibuprofen is 200 to 400 milligrams, which works out to one or two tablets of the standard over-the-counter 200 mg strength. You can take this dose every four to six hours as needed for pain, up to a maximum of 1,200 mg (six tablets) in 24 hours when self-treating without a doctor’s guidance.
The Standard Adult Dose
Over-the-counter ibuprofen tablets almost always come in 200 mg strength. For general pain relief, headaches, muscle aches, or menstrual cramps, 400 mg (two tablets) is the most commonly recommended single dose. One tablet (200 mg) works for milder pain, but two tablets is the dose used in most clinical studies and the one many pharmacists suggest starting with for moderate pain.
You may have heard people mention taking 600 mg, or three tablets at once. That’s a prescription-level dose. While it’s sometimes recommended by doctors for specific situations, research comparing 400 mg to 600 mg has found diminishing returns. Two standard tablets provide strong pain relief for most people, and bumping up to three doesn’t proportionally increase the benefit while it does increase the load on your stomach and kidneys.
How Long to Wait Between Doses
After taking a dose, wait at least four to six hours before taking more. For fever specifically, spacing doses every six to eight hours is typical. Pain relief generally kicks in within about 20 minutes of swallowing the tablets, based on clinical trials measuring both blood levels of the drug and when patients first noticed their pain easing. Peak effects arrive within one to two hours.
The key daily limit for self-treatment is 1,200 mg in 24 hours (six standard tablets spread across the day). Doctors sometimes prescribe higher daily totals for conditions like arthritis, but those doses come with closer monitoring. If you’re buying ibuprofen off the shelf, stick to the 1,200 mg ceiling and avoid using it for more than 10 consecutive days without medical input.
Dosing for Children
Children’s doses are based on weight, not age. The standard pediatric dose is 10 mg per kilogram of body weight, given every six to eight hours as needed. Children’s ibuprofen comes in liquid suspensions and chewable tablets at lower strengths to make this easier to measure. Ibuprofen should not be given to babies younger than 6 months old, as it hasn’t been established as safe for that age group and isn’t FDA-approved for infants under that threshold.
Why More Isn’t Better
Ibuprofen works by blocking the enzymes that produce inflammation and pain signals. Once you’ve taken enough to suppress those enzymes effectively, extra milligrams don’t add much relief. They do, however, increase side effects. The most common is stomach irritation: heartburn, nausea, and in more serious cases, bleeding in the stomach lining. Taking ibuprofen with food or a full glass of water helps reduce this.
Kidney effects are the other concern with higher or prolonged doses. A large study of soldiers without pre-existing kidney problems found a 20% greater risk of kidney function decline among those taking more than seven standard daily doses per month compared to non-users. The risk scales with dose and duration. For people 65 and older or those with heart disease, the kidneys are more vulnerable to these effects regardless of the dose.
Signs You’ve Taken Too Much
An ibuprofen overdose can cause a range of symptoms depending on how much was taken. Early warning signs include severe stomach pain, nausea, and vomiting. More serious overdose symptoms include ringing in the ears, blurred vision, confusion, difficulty breathing, and very low urine output (a sign the kidneys are shutting down). Seizures and loss of consciousness can occur in extreme cases. If you suspect someone has taken a large amount of ibuprofen, contact Poison Control (1-800-222-1222 in the U.S.) or call emergency services.
Who Should Be Cautious
Ibuprofen interacts with several common medications. Blood thinners like warfarin become more potent when combined with ibuprofen, raising the risk of dangerous bleeding. Blood pressure medications, particularly ACE inhibitors, can become less effective. If you take daily low-dose aspirin for heart protection, ibuprofen can interfere with aspirin’s ability to prevent blood clots when taken around the same time.
People with a history of stomach ulcers, kidney disease, or heart failure should use ibuprofen sparingly or avoid it entirely. The same applies during the third trimester of pregnancy. For most healthy adults using it occasionally for a headache or sore muscles, one to two tablets every four to six hours is safe, effective, and unlikely to cause problems.