Adults can take Advil (ibuprofen) every 4 to 6 hours as needed for pain, at a standard dose of 400 mg per dose. The key rule: never exceed the recommended amount in a 24-hour period, and don’t use it for more than 10 consecutive days without medical guidance.
Standard Adult Dosing Schedule
For most types of pain, including headaches, muscle aches, and toothaches, the adult dose is 400 mg every 4 to 6 hours. That translates to two over-the-counter 200 mg tablets at a time. You don’t need to take it on a fixed schedule. The “as needed” part matters: if your pain fades after one dose, skip the next one.
For menstrual cramps specifically, the interval tightens slightly. The recommended dose is 400 mg every 4 hours as needed, since cramp pain tends to return faster. Regardless of what you’re treating, the over-the-counter ceiling is 1,200 mg in 24 hours (three doses of 400 mg). Higher daily amounts, up to 3,200 mg, are sometimes prescribed for chronic conditions like arthritis, but only under a doctor’s supervision.
How Long Each Dose Lasts
Ibuprofen reaches peak levels in your blood about 30 to 35 minutes after you swallow it on an empty stomach. Pain relief typically kicks in within that window and lasts 4 to 6 hours, which is why the dosing interval matches that range. If you find relief wearing off closer to the 4-hour mark consistently, that’s normal, but don’t shorten the gap below 4 hours. Instead, talk to a pharmacist or doctor about whether a higher single dose or a different medication makes more sense.
Dosing for Children
Children’s ibuprofen follows a different schedule: every 6 to 8 hours, not every 4 to 6. The dose is based on your child’s weight, not age, though age can serve as a rough backup if you don’t have a recent weight. Children’s formulations come in liquid suspensions and chewable tablets with lower concentrations than adult versions, so don’t substitute adult tablets for a child.
Ibuprofen should not be given to infants under 6 months old. It hasn’t been established as safe in that age group, and the FDA has not approved its use for them.
How Many Days You Can Take It
The FDA drug facts label puts a clear limit on duration. For pain, stop after 10 days if symptoms haven’t resolved. For fever, the cutoff is shorter: 3 days. These aren’t arbitrary numbers. Longer use without medical oversight raises the risk of stomach ulcers, kidney strain, and cardiovascular problems. If you’re still reaching for Advil after a week, the underlying issue likely needs a different approach.
Protecting Your Stomach
Ibuprofen irritates the stomach lining directly, and repeated doses compound the effect. Taking it at the end of a full meal or with an antacid reduces this irritation significantly. Swallowing it on an empty stomach won’t make it dangerous in a single instance, but it’s more likely to cause nausea or a burning sensation, especially if you’re taking multiple doses over several days.
Alcohol amplifies the stomach risk. Occasional ibuprofen combined with a single drink is unlikely to cause harm for most people, but regular use of ibuprofen alongside regular drinking raises the risk of gastrointestinal bleeding substantially. Long-term use of both together can also damage the kidneys, leading to symptoms like fatigue, swelling, and shortness of breath. If you’re taking ibuprofen daily for any stretch, avoid alcohol during that period.
Timing Around Aspirin
If you take daily low-dose aspirin for heart protection, the timing of your Advil dose matters. Ibuprofen can block aspirin’s blood-thinning effect if the two are in your system at the same time. The FDA recommends taking ibuprofen at least 30 minutes after your aspirin dose, or at least 8 hours before it. This spacing lets aspirin do its job on platelets before ibuprofen competes for the same binding site. These guidelines apply to immediate-release aspirin; if you take enteric-coated aspirin, the interaction timing isn’t well established, so ask your doctor.
Who Should Use Less or Avoid It
All NSAIDs, including ibuprofen, increase the risk of heart attack and stroke. This applies to everyone, but the risk is meaningfully higher in people who already have heart disease. If you have a cardiovascular condition, the safest approach is the smallest effective dose for the shortest time possible.
People with kidney problems face compounded risk because ibuprofen reduces blood flow to the kidneys. Older adults are more vulnerable on both fronts, since kidney function naturally declines with age and cardiovascular disease becomes more common. There’s no separate “elderly dose” on the label, but starting with the lowest effective amount and spacing doses at the longer end of the interval (every 6 hours rather than every 4) is a practical way to reduce exposure.
Quick Reference
- Adults: 400 mg every 4 to 6 hours as needed, max 1,200 mg/day over the counter
- Menstrual cramps: 400 mg every 4 hours as needed
- Children (6 months and older): Weight-based dose every 6 to 8 hours
- Max duration for pain: 10 days without a doctor’s input
- Max duration for fever: 3 days without a doctor’s input
- Best practice: Take with food, avoid alcohol with regular use