If your husband isn't responding to c/l, it's more likely that he has parkinson's plus/parkinsonism. Here's some information from NIH. https://www.ninds.nih.gov/disorders/patient-car... On the other hand, he may not be getting the right dose. Talk to the neurologist.

The golden drug carbadopa/levavopa or however you spell it didn’t work for my husband. So now he takes a dopamine uptake called pramipexal that works great for him. Ask your doctors for alternatives !