Ethambutol is a first-line anti-tuberculosis drug, and its duration of treatment is determined by whether the patient’s chemotherapy history is primary, relapsed, or drug-resistant; primary treatment is usually used for 2 months, relapsed can be used for up to 8 months, and multidrug-resistant patients can be used for the entire course. In the process of use, you need to pay attention to the adverse reactions of ethambutol, its adverse reactions are mainly optic nerve damage, manifested as blurred vision, vision loss and so on. The most common adverse reaction is optic neuritis, the early manifestation of eye swelling and pain, foreign body sensation in the eyes, further development of blurred vision, vision loss. Adverse reactions to medication should be detected in time, and timely measures should be taken to stop the medication.