Answer
Yes. Timolol can mask some warning symptoms of hypoglycaemia and may increase the effects of diabetes medicines.
Sources for this answer
- Brinzolamide/Timolol 10 mg/ml + 5 mg/ml eye drops, suspension — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.