Naproxen can irritate the lining of the stomach and cause gastro-oesophageal reflux or heartburn. Therefore, it is recommended not to lie down shortly after taking the medicine.
If you experience heartburn after taking Naproxen, speak to your doctor or ask a pharmacist for advice. Our online doctor may also be able to prescribe a heartburn treatment to take alongside Naproxen to prevent this side effect.