Answer
Yes. The surgeon and anaesthetist should know because timolol can affect responses to anaesthetics and medicines such as adrenaline.
Sources for this answer
- Brimonidine tartrate/Timolol 2mg/ml + 5mg/ml eye drops, solution — 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.