Hello! Thank you for your detailed query. Both Meva-C and Colospa Retard (mebeverine) are used for IBS-related abdominal cramps, but they differ in composition, formulation, and the recommended timing of administration. The best timing depends on the specific preparation as well as your symptoms and treatment plan. I'd be happy to review your previous and current prescriptions, explain the differences, and guide you on the most appropriate way to take them.
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Please book a teleconsultation with me on Practo so we can discuss this in detail and ensure your treatment is optimized. Wishing you good health!