Proper use of mometasone furoate nasal spray is generally not harmful, there may be some adverse reactions, such as causing headache, burning sensation in the nose, nasal irritation, rhinorrhea, headache, and in the case of pediatric patients, a runny nose. Mometasone Furoate Nasal Spray is a nasal spray glucocorticoid used for the treatment of seasonal or perennial rhinitis and the prophylactic treatment of allergic rhinitis in people over the age of 3 years. Side effects of using this product are headache, nasal irritation, burning sensation in the nose, nasal ulcers, rarely allergic reactions, rare disturbances in the sense of smell and taste, and pediatric patients may have a runny nose. It is contraindicated for those who are allergic to any of the ingredients, pregnant and lactating women should use with caution, and piercing of the nozzle is prohibited. This product should be used under the guidance of a physician, do not self-medicate, so as not to cause adverse consequences.