Get emergency medical help if you have signs of an allergic reaction to Naprosyn: sneezing, runny or stuffy nose; wheezing or trouble breathing; hives; swelling of your face, lips, tongue, or throat.
Get emergency medical help if you have signs of a heart attack or stroke: chest pain, sudden numbness or weakness on one side of the body, slurred speech, feeling short of breath.
Stop using Naprosyn and call your doctor at once if you have:
shortness of breath (even with mild exertion);
swelling or rapid weight gain;
the first sign of any skin rash, no matter how mild;
signs of stomach bleeding - bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds;
liver problems - nausea, upper stomach pain, itching, tired feeling, flu-like symptoms, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
kidney problems - little or no urinating, painful or difficult urination, swelling in your feet or ankles, feeling tired or short of breath;
low red blood cells (anemia) - fatigue, pale skin, feeling light-headed or short of breath, rapid heart rate, trouble concentrating; or
severe skin reaction - fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.
Common Naprosyn side effects may include:
indigestion, heartburn, stomach pain, nausea;
headache, dizziness, drowsiness;
bruising, itching, rash;
swelling; or
ringing in your ears.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Naprosyn side effects (more detail)
