Erythromycin ophthalmic ointment generally refers to erythromycin ophthalmic ointment, gentamycin ophthalmic ointment generally refers to gentamycin hydrochloride ophthalmic ointment, the difference between the two in terms of the type of medication, adverse reactions and so on: 1. Different antibiotic types: erythromycin ophthalmic ointment belongs to macrolide antibiotics, and aureomycin hydrochloride ophthalmic ointment belongs to tetracycline broad-spectrum antibiotics. 2. Adverse reactions are different: erythromycin ophthalmic ointment may lead to persistent eye redness, irritation and pain, eye pain and other symptoms, and may also trigger changes in vision; gentamycin hydrochloride ophthalmic ointment may lead to mild eye irritation, occasional eye congestion, edema, eye itching and other symptoms. Erythromycin ophthalmic ointment and aureomycin hydrochloride ophthalmic ointment have the same mechanism of action, which is to inhibit the synthesis of bacterial proteins and play an antibacterial effect. Antibacterial spectrum is also the same, on the eye common gram-positive bacteria and Chlamydia trachomatis have antibacterial effect. Contraindications to Erythromycin Ophthalmic Ointment vs. Chrysomycin Ophthalmic Ointment are not known. If there is a need to take medication, please follow your doctor’s instructions to choose the appropriate medication.