This Mayo Clinic information on carbidopa-levodopa seems to imply that this is a medication for specifically used for Parkinson's:

- Carbidopa and levodopa (oral route) https://www.mayoclinic.org/drugs-supplements/carbidopa-and-levodopa-oral-route/

That said, many, many medications are used off-label in the U.S. yearly, as this article from the Mayo Clinic Health System outlines:

- Weigh benefits, risks carefully before taking off-label medication https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/taking-off-label-medication

So, not knowing the mind of the doctor who prescribed this medication to @nasbyevan, I do not know at all what was in his or her mind or how he or she chose this medication to try for the leg cramp issues. Do you know at all, nasbyevan?