The standard adult dose of ibuprofen is 200 to 400 mg per dose, taken every four to six hours as needed. Most over-the-counter tablets come in 200 mg strengths, and the FDA label directs adults to take one tablet every four to six hours, or two tablets if the first dose doesn’t provide enough relief. The key limits: no more than three tablets (600 mg) in a single OTC dose, and no more than 1,200 mg in 24 hours unless a doctor has recommended otherwise.
OTC vs. Prescription Doses
Over-the-counter ibuprofen tops out at 400 mg per dose and 1,200 mg per day for self-directed use. Prescription ibuprofen comes in 400 mg, 600 mg, and 800 mg tablets and is used for conditions like rheumatoid arthritis, osteoarthritis, and severe menstrual pain. Under medical supervision, the daily limit can go as high as 3,200 mg for inflammatory conditions like arthritis, though most prescribers aim for 1,200 to 2,400 mg daily because higher doses increase side-effect risk without consistently improving pain relief.
For straightforward pain relief, clinical trials have shown that 400 mg works just as well as higher doses. In other words, taking 600 or 800 mg for a headache or muscle ache doesn’t actually reduce pain more effectively. The higher prescription doses are reserved for reducing inflammation in chronic joint disease, where the anti-inflammatory effect matters more than pure pain control.
How Quickly It Works
Ibuprofen typically starts relieving pain within 30 to 60 minutes of taking it. Each dose lasts about four to six hours, which is why spacing doses at that interval keeps pain from returning. If you’re treating menstrual cramps, taking it at the very first sign of pain (rather than waiting until cramps build) tends to work better, and the recommended dose for that purpose is 400 mg every four hours.
How to Take It Safely
Always use the smallest dose that works. The FDA label is explicit on this point: take the lowest effective amount for the shortest time needed. If 200 mg handles your headache, there’s no reason to take 400 mg.
Taking ibuprofen at the end of a full meal or with an antacid helps protect your stomach lining. It can irritate the esophagus, stomach, and intestines, and that risk goes up the longer you use it. The OTC label sets a 10-day limit for pain use without medical guidance. If you still need it after 10 days, that’s a conversation for your doctor.
Limit alcohol while using ibuprofen. Three or more drinks a day significantly raises the chance of stomach bleeding, especially in adults over 60.
Who Should Be Cautious
Ibuprofen isn’t equally safe for everyone, even at standard OTC doses. Several groups face higher risks:
- Heart disease or stroke history: Regular ibuprofen use can raise the risk of heart attack or stroke. If you’ve recently had a heart attack, avoid it unless specifically directed otherwise.
- Kidney or liver disease: Ibuprofen is processed through the kidneys and liver, and impaired function in either organ can lead to dangerous buildup or worsening damage.
- Stomach ulcers or bleeding history: The risk of gastrointestinal bleeding is meaningfully higher if you’ve had ulcers before, especially if you also take blood thinners, steroids, or other anti-inflammatory drugs.
- Pregnancy (20 weeks or later): Ibuprofen can harm the fetus and cause delivery complications when taken in the second half of pregnancy.
- Adults 75 and older: Age alone increases the risk of stomach bleeding and kidney problems, so the risk-benefit balance shifts.
- Asthma with nasal polyps: This combination can trigger serious allergic-type reactions to ibuprofen.
Drug Interactions to Watch
Ibuprofen interacts with several common medications. Blood thinners are the most significant concern, since combining them raises bleeding risk substantially. Aspirin is another important one: taking ibuprofen regularly can interfere with aspirin’s heart-protective effects.
Less obvious are interactions with common antidepressants, including SSRIs like sertraline (Zoloft) and fluoxetine (Prozac), and SNRIs like duloxetine (Cymbalta) and venlafaxine (Effexor). These medications already affect bleeding risk on their own, and adding ibuprofen compounds the effect. Oral steroids like prednisone also increase stomach irritation when combined with ibuprofen, as does taking more than one type of anti-inflammatory drug at the same time.
Quick Reference by Use
- General pain (headache, muscle ache, toothache): 200 to 400 mg every 4 to 6 hours. Max 1,200 mg/day OTC.
- Menstrual cramps: 400 mg every 4 hours as needed, starting at the first sign of pain.
- Arthritis (prescription only): 1,200 to 3,200 mg daily, divided into three or four doses.