I have a similar problem with meds (Madopar 100/25) suddenly lasting only 90 mins approx so all of the comments have been helpful thanks. I currently take meds 3 hourly.

I have very recently added Entacopone, too early to comment on how well it works. I notice with interest that some here appear to have shortened the time between doses rather than add entacopone. I'd be interested in hearing why/how you make that choice.