Answer
Keep capsules in their blister until needed. Keep the inhaler dry, never wash it with water, and clean the mouthpiece with a dry cloth.
Sources for this answer
- Onbrez Breezhaler 150 and 300 microgram inhalation powder, hard capsules — 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.