The typical adult dosage of Aleve, a brand of naproxen, is 250 mg to 500 mg orally, twice per day, according to Drugs.com. The recommended geriatric dosage is 250 mg every eight hours. Pediatric and juvenile dosages vary, but they are usually significantly lower than adult dosages.
People with allergies to aspirin should not take Aleve, Drugs.com reports. Long term use of Aleve can increase the risk of heart attack or stroke, and people with a history of heart disease are also at an increased risk for these complications. People should not take Aleve before or after heart bypass surgery, and taking Aleve during the third term of pregnancy increases the risk for birth defects.