Adults can take up to 400 mg of Advil (ibuprofen) every four to six hours, with a maximum of 1,200 mg per day for over-the-counter use. Prescription doses can go higher, up to 3,200 mg daily, but only under medical supervision. Each regular-strength Advil tablet contains 200 mg, so the standard dose is one to two tablets at a time.
Standard Adult Dosage
For general pain, headaches, or fever, the recommended dose is 200 to 400 mg every four to six hours. That translates to one or two standard Advil tablets per dose. You shouldn’t exceed 1,200 mg (six tablets) in 24 hours when using it without a prescription, and you shouldn’t use it for more than 10 days in a row for pain or 3 days for fever without talking to a doctor.
For conditions like arthritis or severe menstrual cramps, doctors sometimes prescribe higher doses. Prescription ibuprofen for rheumatoid arthritis or osteoarthritis can range from 1,200 to 3,200 mg per day, divided into three or four doses throughout the day. Menstrual cramps are often treated with 400 mg every four hours as needed. These higher doses carry more risk and require medical oversight.
Timing and Food
Despite the common advice to always take ibuprofen with food, low doses (up to 1,200 mg daily for up to a week) can be taken on an empty stomach safely, and doing so actually provides faster pain relief. Food slows down how quickly ibuprofen is absorbed, though it doesn’t change the total amount your body takes in. There’s no strong scientific evidence that taking low-dose ibuprofen with food prevents stomach irritation.
That said, at higher prescription doses (above 1,200 mg daily), the risk of stomach irritation jumps to two to three times higher. If you’re taking those amounts, eating something first is a reasonable precaution.
Dosing for Children
Children’s doses are based on weight, not age. Age is only a rough guide when weight isn’t available. Ibuprofen should not be given to infants under 6 months old, as its safety hasn’t been established in that age group. For older children, doses can be repeated every six to eight hours as needed, which is a longer interval than for adults. The adult dose of 400 mg applies once a child is large enough, typically around 88 pounds or more.
What Happens If You Take Too Much
Ibuprofen has a relatively wide safety margin compared to some other pain relievers. Doses under 100 mg per kilogram of body weight generally cause minimal symptoms. For a 150-pound adult, that’s roughly 6,800 mg, well above the recommended maximum. Life-threatening toxicity typically doesn’t occur until ingestion reaches 400 mg per kilogram or more.
That doesn’t mean exceeding the recommended dose is safe. In a review of 126 ibuprofen overdose cases, about 19% of patients developed symptoms, most commonly nausea, vomiting, abdominal pain, and drowsiness, usually within four hours. At very high doses, more serious effects can include seizures, dangerously low blood pressure, and kidney or liver damage. Some people also experience ringing in the ears or temporary hearing changes.
Risks of Regular High-Dose Use
Taking ibuprofen at high doses over weeks or months introduces cardiovascular and digestive risks that occasional use doesn’t. A large analysis of randomized trial data found that prolonged high-dose ibuprofen increases the risk of a major cardiovascular event (heart attack, stroke, or cardiovascular death) by about one third. In practical terms, that works out to roughly 3 extra heart attacks per year for every 1,000 people taking high doses continuously, one of which would be fatal.
The risk of stomach or intestinal bleeding also rises two to four times with regular use, though most bleeding episodes from ibuprofen aren’t life-threatening. These risks are the main reason over-the-counter labels cap both the dose and the duration.
Who Should Be Extra Cautious
If you take blood thinners, ibuprofen is a risky combination. Ibuprofen affects how platelets work, which interferes with normal clotting. Combining it with anticoagulants or antiplatelet drugs significantly raises the chance of bleeding, especially in the digestive tract.
People with existing kidney problems should also be careful, since ibuprofen reduces blood flow to the kidneys. This effect is usually harmless in healthy people but can push compromised kidneys into trouble, particularly at higher doses or with prolonged use.
Pregnancy adds another layer of concern. The FDA warns against using ibuprofen (or any NSAID) at 20 weeks of pregnancy or later. After that point, the baby’s kidneys produce most of the amniotic fluid, and ibuprofen can impair fetal kidney function, leading to dangerously low fluid levels. After 30 weeks, there’s an additional risk of a blood vessel in the baby’s heart closing prematurely. If ibuprofen is absolutely necessary between weeks 20 and 30, it should be the lowest effective dose for the shortest time possible.