Answer
Cystagon is a conventional capsule, whereas Procysbi contains gastro-resistant granules that delay release. Their food, handling and storage instructions differ.
Sources for this answer
- Cystagon 50 mg hard capsules — Current selected SmPCemc · Summary of Product Characteristics
- PROCYSBI 25 mg & 75 mg gastro-resistant 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.