Answer
Keep it refrigerated in its original container, away from children and pets. Return unwanted tablets to a pharmacy rather than using household waste or wastewater.
Sources for this answer
- Chlorambucil 2mg tablets — 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.