Erythromycin ophthalmic ointment inhibits bacterial synthesis of proteins and thus has antimicrobial properties, and can be used for conjunctivitis, trachoma, blepharitis, and external eye infections. There are side effects such as change in vision, eye pain, persistent burning sensation or redness at the site of application. Hands should be washed before use, care should be taken not to contact with other mucous membranes such as mouth, nose, etc. If burning sensation, redness, etc. occurs at the site of application after use, the drug should be stopped immediately and the applied drug should be washed clean. Allergic to the drug is prohibited; prohibited when the drug properties change. Allergic persons should use with caution. If you need to use the drug patients, please be sure to strictly comply with the instructions of the doctor or pharmacist under the guidance of the medication, do not self-medication.