Answer
Yes. It can cause optic neuritis, leading to blurred or dim vision, altered colour perception or visual-field loss. Stop it and contact the specialist team urgently if these occur.
Sources for this answer
- Ethambutol hydrochloride 400mg Film-coated tablets — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.