Erythromycin ophthalmic ointment can not be wiped on the nasal cavity, this product can not contact the oral and nasal mucosa, so there is no up to a few days of application; its efficacy is bacteriostatic, the main treatment of trachoma, blepharitis and external ocular infections and so on. Erythromycin ophthalmic ointment is white to yellow ointment, the main ingredient is erythromycin. It should not be used in the nasal cavity, and should not be used to contact the oral and nasal mucous membrane areas to avoid adverse consequences; the efficacy of erythromycin ophthalmic ointment is to inhibit the synthesis of Chlamydia trachomatis and Gram-positive bacterial proteins, and it is mainly used for the treatment of blepharitis, conjunctivitis, trachoma and external ocular infections. Adverse reactions to erythromycin ophthalmic ointment are allergic reactions, eye irritation, redness, occasional changes in vision, and eye pain can occur. Contraindications are that it is contraindicated in those who are allergic to it. Precautions are to avoid contact with other mucous membranes (e.g., mouth, nose, etc.) and to wash hands before use. If you need to use erythromycin ophthalmic ointment, it should be applied under the guidance of a physician, and should not be used on its own to avoid adverse consequences.