When applying erythromycin ophthalmic ointment patients should keep their hands clean, and then gently pull the lower eyelid to expose the lower eyelid, and then apply the ointment inside the eyelid. Erythromycin ophthalmic ointment is indicated for patients with trachoma, conjunctivitis, blepharitis and other diseases to external ocular infections to achieve antibacterial and inhibit bacterial protein synthesis. Contraindications to erythromycin ophthalmic ointment are unclear. Some patients may experience adverse reactions such as eye pain, vision changes, and persistent redness after use. If the adverse reactions are serious, it is necessary to stop using the medication and go to the hospital. If you need to use erythromycin ophthalmic ointment, it is recommended that patients use the medication under the guidance of a doctor to avoid unauthorized use of the drug, so as not to delay the condition.