Tretinoin Nasal Spray is usually administered once a day by intranasal inhalation, and the exact dosage should be followed by the doctor. Tretinoin Nasal Spray should be shaken well before use to make it uniform. When treating with intranasal spray, pressing should be done quickly to ensure a dose per spray. Adults and children over 12 years of age: two sprays in each nostril once daily (220 μg/day). The total daily dose should not exceed eight sprays.Children aged 6 to 12 years: one spray per nostril once a day (110 μg/day).For optimal efficacy, there should be regular dosing. Tretinoin Nasal Spray is mainly used for the prevention and treatment of perennial and seasonal allergic rhinitis, which is characterized by symptoms such as itchy nose, nasal obstruction, runny nose and sneezing. Adverse reactions include dryness or burning sensation in the nasopharynx, mild nosebleed, headache, etc.; patients should seek medical attention as soon as possible if they experience yellowish or greenish nasal discharge, feeling of odor, more severe tingling sensation in the nose or pharynx, or nosebleed. Tretinoin Nasal Spray is contraindicated in patients who are allergic to the ingredients contained in Tretinoin Nasal Spray, and should be used with caution in the presence of active tuberculosis of the respiratory tract, untreated mycosis, systemic or viral infections, herpes simplex virus infection of the eye, nasal septal ulcers, nasal surgery or post-traumatic injury, and should be used with caution in pregnant women and breastfeeding women. If you need to use Trimethoprim Nasal Spray, please consult a professional doctor, follow the doctor’s instructions for standardized treatment, do not blindly use the drug on their own.