A single 220 mg dose of Aleve (naproxen sodium) stays in your system for roughly 3 to 4 days. The active ingredient, naproxen, has an elimination half-life of about 12 to 17 hours, meaning your body clears half of the dose in that window. It takes about five half-lives for a drug to be effectively eliminated, which puts total clearance somewhere between 60 and 85 hours.
How Aleve Moves Through Your Body
After you swallow a 220 mg Aleve tablet, the naproxen sodium dissolves quickly and enters your bloodstream. Meaningful levels show up within about 20 minutes. On an empty stomach, the drug reaches its peak concentration in roughly 1 to 2 hours. If you take it with food, that peak shifts to around 2 to 3 hours, sometimes longer.
Once in your blood, over 99% of the naproxen binds to a protein called albumin. This protein binding acts like a reservoir, slowly releasing the drug and contributing to its long duration of action. Pain relief from a single dose typically lasts 8 to 12 hours, which is why Aleve is marketed as an “all day” pain reliever even though the drug itself lingers in your body well beyond that window.
The Half-Life Calculation
The elimination half-life of naproxen averages about 15 hours, though it can range from 12 to 17 hours depending on the person. Here’s what that looks like in practice for a 220 mg dose:
- After 15 hours: roughly 110 mg equivalent remains
- After 30 hours: roughly 55 mg remains
- After 45 hours: roughly 27 mg remains
- After 60 hours: roughly 14 mg remains
- After 75 hours: trace amounts remain
By about 75 hours (just over 3 days), less than 3% of the original dose is still circulating. For someone on the slower end of the clearance range, with a 17-hour half-life, that timeline stretches closer to 3.5 to 4 days. Either way, a single 220 mg tablet is essentially gone within four days.
What Happens With Repeated Doses
If you’ve been taking Aleve regularly (say, one tablet every 8 to 12 hours for several days), the drug accumulates in your system. Steady-state levels are reached in 4 to 5 days of consistent use, meaning the amount building up matches the amount being cleared. From that steady state, full clearance takes longer than it would after a single pill, potentially 5 to 6 days from your last dose.
Factors That Slow Clearance
Your kidneys do the heavy lifting when it comes to removing naproxen. The drug is broken down in the liver, and those byproducts are excreted through urine. Anything that compromises kidney or liver function can extend the timeline.
Age is one of the biggest variables. In older adults, kidney function naturally declines, and the fraction of unbound (active) naproxen in the blood increases. FDA data shows that unbound naproxen concentrations in elderly individuals can be two to three times higher than in younger adults, even when the total amount in the blood looks the same. This means the drug is more active and potentially more persistent in older people.
Kidney impairment directly slows elimination. People with significant kidney problems clear naproxen more slowly, and its byproducts can accumulate. Naproxen-containing products are generally not recommended for people with moderate to severe kidney disease.
Liver disease changes the equation differently. Conditions like chronic alcoholic liver disease reduce the amount of albumin in the blood, which means less of the naproxen is bound to protein. The total amount in circulation may drop, but the unbound, active portion rises, intensifying effects even as the overall level appears lower.
Why This Timeline Matters
People searching this question often have a specific reason: a surgery coming up, a drug test, a concern about interactions, or switching to a different pain reliever. Naproxen is a nonsteroidal anti-inflammatory drug that affects blood clotting, so surgeons typically want it out of your system before a procedure. Given the clearance timeline, stopping Aleve at least 3 to 4 days before surgery is a common recommendation.
For drug testing, standard workplace panels screen for illegal substances and naproxen is not among them. However, naproxen has historically caused false positives on some older immunoassay urine screens for marijuana or barbiturates. Confirmatory testing (which most labs run automatically on a positive result) will rule out naproxen as the cause, but it’s worth knowing if you’re taking a screening test within a few days of your last dose.
If you’re switching to another anti-inflammatory or a blood thinner, the 3-to-4-day window gives you a practical benchmark. For most healthy adults after a single 220 mg tablet, the drug is functionally cleared within 3 days. If you’re older, have been taking it regularly, or have kidney concerns, allow closer to 5 or 6 days.