Answer
Carbidopa monohydrate is the form of carbidopa in co-careldopa; co-careldopa combines carbidopa with levodopa.
Sources for this answer
- Co-Careldopa 12.5mg/50 mg — 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.