1865
Ethambutol is frequently used in the treatment of tuberculosis, and, although optic neuropathies have been reported with the use of ethambutol, this adverse side effect has been considered to be rare and generally reversible with discontinuation of the medication.
 ( potential therapeutic event: used ,  Ethambutol: Treatment, tuberculosis: Treatment.Disorder, Ethambutol: Treatment.Drug) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( potential therapeutic event: used ,  Ethambutol: Treatment, tuberculosis: Treatment.Disorder, Ethambutol: Treatment.Drug) 