Naproxen is available both as a prescription drug and as an over-the-counter (OTC) medication. The difference comes down to dosage strength and what you’re using it for. You can buy lower-dose naproxen sodium (220 mg per tablet) without a prescription under brand names like Aleve, while higher-strength versions (250 mg, 375 mg, 500 mg, and controlled-release 750 mg tablets) require a prescription.
OTC vs. Prescription Strength
Over-the-counter naproxen sodium is sold in 220 mg tablets. At this dose, it’s intended for temporary relief of minor aches, headaches, muscle pain, menstrual cramps, and fever. OTC labels typically recommend no more than two or three tablets in a 24-hour period and limit use to 10 consecutive days for pain (or 3 days for fever) before you need to check with a doctor.
Prescription naproxen comes in significantly higher doses. Tablets are available at 250 mg, 375 mg, and 500 mg, plus a controlled-release formulation at 375 mg or 750 mg. Depending on the condition being treated, prescription daily doses can reach up to 1,500 mg, which is far more than you’d get from OTC tablets. Extended-release versions also deliver the drug differently, releasing it gradually so patients can take fewer doses per day.
What Prescription Naproxen Treats
Doctors prescribe higher-strength naproxen for chronic and inflammatory conditions that need sustained, stronger pain control. These include osteoarthritis, rheumatoid arthritis, juvenile arthritis, and ankylosing spondylitis (a type of arthritis that primarily affects the spine). It’s also prescribed for bursitis, tendinitis, gout attacks, and menstrual pain when OTC doses aren’t enough.
The key distinction is duration and intensity. If you’re managing a one-off headache or sore muscles after exercise, OTC naproxen is designed for that. If you have a condition causing ongoing joint inflammation or recurring flare-ups, a prescription gives your doctor control over a higher dose tailored to your situation, along with monitoring for side effects over time.
How Naproxen Works
Naproxen belongs to a class of drugs called NSAIDs (nonsteroidal anti-inflammatory drugs), the same family as ibuprofen. It works by blocking enzymes called COX-1 and COX-2, which your body uses to produce prostaglandins. Prostaglandins are chemicals that trigger inflammation, swelling, and pain at injury sites. By reducing prostaglandin production, naproxen lowers inflammation and dulls pain signals.
One practical advantage of naproxen over ibuprofen is that it lasts longer in the body. A single dose of naproxen provides relief for 8 to 12 hours, compared to 4 to 6 hours for ibuprofen. This means fewer doses throughout the day, which is part of why it’s a common choice for conditions that cause all-day discomfort.
Risks With Higher Doses and Long-Term Use
The reason higher doses require a prescription isn’t just about effectiveness. It’s also about safety monitoring. Naproxen can cause stomach ulcers or bleeding in the digestive tract, especially with long-term use. If you’ve had a stomach ulcer before, your doctor may prescribe a stomach-protecting medication alongside naproxen, or suggest a different pain reliever entirely.
Like all NSAIDs, naproxen also carries cardiovascular risks. The FDA requires a warning on all NSAID labels noting that these drugs can increase the chance of heart attack or stroke, particularly at higher doses or with prolonged use. This risk applies to both OTC and prescription versions, but it becomes more relevant when someone is taking prescription-strength doses over weeks or months. The general guidance from the FDA is to use the lowest effective dose for the shortest time that meets your treatment goals.
Other common side effects include nausea, heartburn, dizziness, and headache. These tend to be more frequent at higher doses. People with kidney problems, heart disease, or a history of stomach bleeding need closer medical supervision when taking naproxen regularly, which is another reason higher doses are gated behind a prescription.
Common Brand Names
The OTC version is most widely recognized as Aleve, though store-brand equivalents are available at most pharmacies under names like “All Day Pain Relief” or generic naproxen sodium. Prescription versions are sold under brand names including Naprosyn (naproxen), Anaprox and Anaprox DS (naproxen sodium), and Naprelan (controlled-release naproxen sodium). The active ingredient is the same across all of them. The difference is the dose per tablet and whether the formulation is immediate-release or controlled-release.