Adults can take Advil (ibuprofen) every 6 to 8 hours as needed, with a maximum of 1,200 mg per day when using the over-the-counter strength. That means up to three doses of 400 mg in a 24-hour period. For self-treatment of pain, you should not take it for more than 10 consecutive days, or more than 3 consecutive days for fever.
Standard Dosing for Adults
Each over-the-counter Advil tablet contains 200 mg of ibuprofen. The recommended adult dose is 200 to 400 mg every 6 to 8 hours. Most people take one or two tablets at a time, waiting at least six hours before the next dose. The key rule: do not exceed 1,200 mg (six tablets) in 24 hours without a doctor’s guidance.
Prescription-strength ibuprofen allows for higher amounts, up to 3,200 mg per day split into three or four doses, but that range is only appropriate under medical supervision. If you’re grabbing Advil off the shelf, stick to the OTC ceiling of 1,200 mg daily.
How Long You Can Keep Taking It
Advil is designed for short-term use. For pain relief, the limit is 10 days in a row. For fever, it’s 3 days. If your symptoms persist beyond those windows, that’s a signal to check in with a healthcare provider rather than continuing to self-treat. The issue isn’t just that the medication might stop working. The longer you take ibuprofen, the more likely you are to develop side effects that build gradually, particularly in your stomach and kidneys.
Dosing for Children
Children’s Advil follows different rules. Kids can take ibuprofen every 6 to 8 hours, just like adults, but the dose is based on weight rather than a flat tablet count. Ibuprofen should not be given to infants younger than 6 months old. For children older than that, follow the weight-based dosing chart on the product packaging carefully, since children’s formulations come in different concentrations.
Why Timing Matters
Ibuprofen works by blocking enzymes in your body that produce compounds called prostaglandins. Prostaglandins drive inflammation, pain, and fever, so when ibuprofen shuts down their production, you feel relief. But these same compounds also do useful things: they help maintain the protective lining of your stomach and regulate blood flow to your kidneys. That’s why taking too much, or taking doses too close together, creates problems. You’re not just getting more pain relief. You’re also suppressing the processes that protect your gut and kidneys for a longer stretch.
The 6-to-8-hour spacing exists because that’s roughly how long each dose remains active. Taking your next dose before the previous one has worn off stacks the drug’s effects and raises your risk of side effects without meaningfully improving pain control.
Risks of Taking It Too Often
The most common issue with frequent ibuprofen use is stomach irritation. Because the drug reduces the protective mucus lining in your stomach, regular use can lead to heartburn, nausea, and in more serious cases, stomach ulcers or gastrointestinal bleeding. These risks increase the longer you take it and the higher your dose.
Your kidneys are the other major concern. Ibuprofen reduces blood flow to the kidneys, which can cause acute kidney injury, especially if you’re dehydrated, older, or already have reduced kidney function. Prolonged use can also raise blood pressure and cause fluid retention, which puts extra strain on your heart. People with existing heart disease, kidney disease, or a history of stomach ulcers are at significantly higher risk for all of these complications.
How to Reduce Side Effects
Take Advil at the end of a full meal or with an antacid. Food acts as a buffer between the medication and your stomach lining, which noticeably reduces irritation. Taking it on an empty stomach is one of the most common reasons people experience nausea or heartburn from ibuprofen. Staying well hydrated also helps protect your kidneys while the drug is active.
Use the lowest dose that controls your symptoms. If one 200 mg tablet handles your headache, there’s no benefit to taking two. And if you find yourself reaching for Advil daily, that’s worth addressing with a provider, since the underlying cause of your pain may need a different approach.
Who Should Avoid Advil
Some people should not take ibuprofen at all, or should only use it under close medical supervision:
- Recent heart attack or heart surgery: Ibuprofen can increase cardiovascular risk and should not be taken right before or after coronary artery bypass surgery.
- Stomach ulcers or GI bleeding history: The drug’s effect on your stomach lining makes recurrence more likely.
- Kidney or liver disease: Reduced organ function means your body clears the drug more slowly, amplifying side effects.
- Pregnancy at 20 weeks or later: Ibuprofen can harm the fetus and cause complications during delivery.
- Asthma with nasal polyps: This combination increases the risk of a serious allergic-type reaction to ibuprofen.
Medications That Interact With Advil
Ibuprofen does not mix well with blood thinners, as the combination significantly raises bleeding risk. It also interacts with other anti-inflammatory drugs like aspirin and naproxen (Aleve), so you should not stack multiple NSAIDs unless specifically told to. Common antidepressants, including SSRIs like sertraline (Zoloft) and fluoxetine (Prozac), can also increase bleeding risk when combined with ibuprofen. Oral steroids like prednisone compound the stomach-related side effects. If you take any of these medications regularly, talk to your pharmacist or doctor before adding Advil to the mix.