Answer
Drowsiness is not expected because systemic exposure is very low and epinastine does not readily enter the brain. Temporary blurred vision may still affect driving.
Sources for this answer
- Relestat 0.5 mg/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.