## **Core Concept**
Ethambutol is a first-line antitubercular medication used in combination therapy for the treatment of tuberculosis (TB). One of its notable side effects is related to vision, specifically optic neuritis leading to visual disturbances. This side effect is particularly concerning in populations where monitoring might be challenging.

## **Why the Correct Answer is Right**
The correct answer, , relates to the risk of optic neuritis associated with ethambutol use. This condition can lead to decreased visual acuity and even color blindness. The concern in children is that they may not be able to report these symptoms accurately, making early detection of this side effect difficult. The risk of optic neuritis is dose-dependent, and guidelines often recommend careful monitoring of visual acuity in patients on ethambutol.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While ethambutol can have gastrointestinal side effects, they are not the primary concern regarding its use in children.
- **Option B:** Hepatotoxicity is a concern with several antitubercular drugs, including isoniazid and rifampicin, but it is not the specific concern with ethambutol in children.
- **Option C:** Ethambutol does not have a significant association with ototoxicity; this is more commonly a side effect of aminoglycosides like streptomycin.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the use of ethambutol in children requires careful consideration due to the potential for optic neuritis. When used, it is recommended to monitor visual acuity regularly. The American Academy of Pediatrics suggests that ethambutol can be used in children when the potential benefits outweigh the risks, with careful monitoring.

## **Correct Answer:** . Optic neuritis leading to visual disturbances.