Most adults can take 200 to 400 mg of ibuprofen every four to six hours as needed, with a maximum of 1,200 mg in 24 hours when using over-the-counter doses. That ceiling is higher under medical supervision, up to 3,200 mg per day for conditions like arthritis, but the standard store-bought limit exists for good reason.
Standard Adult Doses
A single over-the-counter ibuprofen tablet is typically 200 mg. For most types of pain, the recommended dose is 200 to 400 mg (one to two tablets) every four to six hours. For menstrual cramps specifically, 400 mg every four hours tends to work best. In all cases, you should use the lowest dose that relieves your symptoms and avoid exceeding 1,200 mg in a single day without a doctor’s guidance.
Prescription-strength ibuprofen allows for higher daily totals. People managing osteoarthritis or rheumatoid arthritis may take 1,200 to 3,200 mg per day, split into three or four doses. These higher amounts come with more monitoring and aren’t meant for occasional headaches or muscle soreness.
Dosing for Children
Children’s doses are based on weight, not age, though age can serve as a rough guide if you don’t have a recent weight. Ibuprofen should not be given to babies under 6 months old. For older children, liquid formulations and chewable tablets come in lower concentrations, and you can give a dose every six to eight hours as needed. The packaging includes a weight-based chart, and sticking to it matters more than it does for adults because even small overdoses relative to body size carry more risk.
How Long You Can Keep Taking It
For pain relief, the general guideline is no more than 10 consecutive days. For fever, the window is shorter: three consecutive days. If you still need ibuprofen after those timeframes, the pain or fever itself is the issue worth investigating, not just masking.
People sometimes fall into a pattern of daily ibuprofen use for chronic aches, especially back or joint pain. This quietly raises the risk of stomach ulcers, kidney stress, and cardiovascular problems. If you find yourself reaching for ibuprofen most days, that’s a signal to explore other management options rather than continuing to self-treat.
Take It With Food
Ibuprofen works by blocking chemicals that cause inflammation, but the same mechanism also reduces the protective lining of your stomach. Taking it on an empty stomach increases the chance of irritation, heartburn, and in more serious cases, small erosions (ulcers) in the stomach lining. Eating a full meal before your dose, or taking it with an antacid, significantly reduces that risk. This is especially important if you’re taking it multiple times a day or for several days in a row.
Who Should Avoid Ibuprofen or Use Less
Several common health conditions make ibuprofen riskier, even at standard doses. Heart failure, coronary artery disease, high blood pressure, diabetes, and kidney problems all increase the chance of side effects. Adults over 65 face higher risk as well, partly because kidney function naturally declines with age.
Dehydration is a particularly important and often overlooked factor. When your body is low on fluids from vomiting, diarrhea, heavy sweating, or simply not drinking enough, your kidneys rely more heavily on the exact processes that ibuprofen suppresses. Taking it while dehydrated can cause a sharp drop in kidney function that wouldn’t happen when you’re well-hydrated.
Certain medication combinations also raise the stakes. If you take blood pressure medications (particularly ACE inhibitors or water pills), the combination with ibuprofen increases the risk of acute kidney injury, especially within the first 30 days of combined use. Organ transplant recipients on anti-rejection drugs face similar risks. If you’re on any prescription medications, checking for interactions before adding ibuprofen is worth the effort.
Signs You’ve Taken Too Much
Mild ibuprofen overdose usually shows up as nausea, vomiting, stomach pain, and heartburn. These symptoms overlap with normal side effects, so people sometimes dismiss them. More concerning signs include ringing in the ears, blurred vision, severe headache, and confusion. In serious overdoses, breathing may slow, blood pressure can drop, and urine output may decrease sharply, all of which signal kidney and cardiovascular distress that needs emergency attention.
If you suspect you or someone else has taken significantly more than the recommended dose, contact poison control (1-800-222-1222 in the U.S.) or seek emergency care. The risk depends not just on the total amount but also on body weight, hydration status, and kidney health going in.