The hazards of eye drop allergy after eye surgery mainly include causing local or systemic discomfort and affecting postoperative recovery; in severe cases, anaphylactic shock may occur. When allergic reaction occurs when eye drops are used after eye surgery, it can lead to local reactions such as burning sensation, redness, swelling and tearing of the eyes, itching of the eyes, etc., and some patients may have systemic reactions such as generalized rash and itching, which will cause physical and mental discomforts to the patients, affecting their life and sleep, and adversely affecting their post-surgery recovery to a certain extent. However, the above symptoms can be relieved after discontinuing the allergy medication. If necessary, patients can consider taking anti-allergy medication, such as levocetirizine tablets. A small number of patients may experience severe allergic reactions due to eye drop allergy, such as anaphylaxis and allergic asthma, which can lead to serious and life-threatening consequences if not treated in time. If symptoms related to eye drop allergy occur after surgery, the medication should be stopped immediately and the patient should go to a regular medical institution in a timely manner for anti-allergy treatment under the guidance of a physician, so that the patient’s condition will not be delayed and the medication will not be used arbitrarily.