Answer
It is contraindicated in asthma, a history of asthma and severe COPD because timolol can cause bronchospasm.
Sources for this answer
- Dorzolamide/Timolol 20mg/ml + 5mg/ml eye drops, solution in single-dose container — 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.