Warning - Sinemet contraindication

I have previously warned about the use of Sinemet. Some people find that, after taking the first dose each morning, their ability to walk easily during the rest of the day is disrupted. I’d be interested in hearing from anyone with this issue. Thanks.

Sinemet and madopar are the standard treatments for those symptoms and for Parkinons disease in general. Could you share your references for this warnign please.