Answer
The selected bottle should be discarded four weeks after opening. Writing the opening date on the label can help prevent use beyond this period.
Sources for this answer
- Hayeeze 1mg/ml Eye Drops Solution — 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.