Tretinoin Nasal Spray is mainly used to treat perennial allergic rhinitis or seasonal allergic rhinitis, which is characterized by symptoms such as itching, nasal obstruction, sneezing, and runny nose. Possible adverse reactions to Trimethoprim Nasal Spray include cough, epistaxis, pharyngitis, headache, drug-induced rhinitis, dryness or burning sensation in the throat, sneezing, mild rhinorrhea, and in rare cases, elevated eye pressure or nasal septal perforation. It is contraindicated for those who are allergic to the ingredients contained in this product, and for children under six years of age. Use with caution in pregnancy and lactation, in patients with active tuberculosis of the respiratory tract, untreated fungal disease, systemic or viral infections ocular herpes simplex virus infection. If you need to use Trimethoprim Nasal Spray, please consult a professional doctor, follow the doctor’s instructions, and use medication wisely.