Antihistamine eye drops commonly used in clinical practice include emetine fumarate eye drops, azelastine hydrochloride eye drops and so on. Antihistamines are mainly used for allergic conjunctivitis, which can effectively relieve the itching, redness, increased secretion and other discomfort in the eyes. If the symptoms are more serious, they can be used in combination with other anti-allergy eye drops, such as non-steroidal anti-inflammatory drugs like Pranoprofen. Antihistamines are contraindicated in patients who are allergic to their ingredients and should be stopped immediately if eye irritation occurs. As most eye medicines contain preservatives, long-term use is not recommended. It is recommended that people with eye discomfort consult a doctor in time, after a clear diagnosis, treatment for the cause of the disease, and use medication under the guidance of the doctor.