<prompt> Ethambutol is avoided in children as it causes -Dental maldevelopmentVisual disturbanceRenal failureGrowth retardation  <response>: Ans. is b i.e., Visual disturbanceo The main adverse effect of Ethambutol is retrobulbar optic neuritis unilateral or BL.o This causes loss of visual activity, red-green colour blindness, central scotoma, peripheral vision loss.o The changes reverse, if the tt is stopped promptly if not, the patient may go blind.o Children below 6 years of age are not given ethambutol because children are unable to report early visual deterioration.o Ethambutol also produces hyperuricemia. 