Take naproxen tablets with or just after a meal or snack. Take the lowest dose of naproxen for the shortest time to control your symptoms. The most common side effects of naproxen are confusion, headache, ringing in the ears, changes in vision, tiredness, drowsiness, dizziness and rashes. Naproxen is used as a treatment to relieve pain from various conditions such as headaches, muscle aches, tendonitis, dental pain, and menstrual cramps. Learn about side effects, drug interactions, dosages, warnings, and more. Uses. See also Warning section. Naproxen is used to relieve pain from various conditions such as headache, muscle aches, tendonitis, dental pain, and menstrual cramps. Along with its needed effects, naproxen may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Although not all of these side effects may occur, if they do occur they may need medical attention. Since both ibuprofen and naproxen are NSAIDs, they have similar side effects and adverse effects. Ibuprofen and naproxen may increase the risk of blood clots, heart attack, and stroke. Common side effects of both drugs include heartburn, constipation, nausea, diarrhea, abdominal pain, dizziness, headaches, drowsiness, and tinnitus (ringing in the ears). Other serious side effects include edema. As with most medicines, naproxen side effects are more likely with higher doses and if you take the medicine for long periods of time, so if you take the occasional non-prescription dose for. Common side effects of naproxen include upset stomach, mild heartburn, stomach pain, diarrhea, constipation, bloating, gas, dizziness, headache, nervousness, blurred vision, and ringing in the. The most common side effects of naproxen are confusion, headache, ringing in the ears, changes in vision, tiredness, drowsiness, dizziness and rashes. You should not use naproxen if you are allergic to it, or if you have ever had an asthma attack or severe allergic reaction after taking aspirin or an NSAID. This may lead to more methotrexate or aminoglycoside-related side effects. Individuals taking anticoagulants , for example, warfarin , ( Coumadin ), should avoid naproxen because naproxen also thins the blood, and excessive blood thinning may lead to bleeding. Naproxen can pass into breast milk and may cause side effects in the nursing baby. You should not breast-feed while using this medicine. You should not breast-feed while using this medicine. Naproxen is not approved for use by anyone younger than 2 years old.