Wracking my brains to recall the name of a levadopa drug - not Madopar but one just as common. There were worries of shortages a few years ago. All I can come up with is Sinemet, but is there another one that might fit the bill? Is there one beginning with Z (but not Zelapar)? Something like Zeratogin?
Drug Treatment for Parkinson's is one very useful publication which
will help you explore what/why/when of current treatments Clive.
and from around the world -
There was a shortage of sinemet about a year ago, maybe 2 years? I think they closed one of the factories or something Sunray