I found these -
[Information about the temporary global supply shortage of SINEMET AND SINEMET CR

Merck (known as MSD outside the U.S. and Canada) is currently managing a temporary global supply shortage of SINEMET® (carbidopa-levodopa) and SINEMET CR® (carbidopa-levodopa controlled release), which are Merck's Parkinson's disease products. I would like to personally express our sincere apology for this supply interruption. Merck is doing its best to restore supplies as soon as possible and sincerely regrets any inconvenience or distress this interruption has caused to people who rely on SINEMET.

The extent of this supply shortage varies from country to country. Although our supply estimates change from time to time, all dosage strengths of SINEMET IR (immediate release) are now fully available in most markets, and SINEMET CR is in the process of being re-supplied. We expect SINEMET CR to be fully available by mid 2011 to most markets, contingent on regulatory approvals (see below). ]
more-
http://www.epda.eu.com/news/2010-07-29-epda/

and - googled results- sinemet shortage 2011 -
http://www.google.com/search?q=Name+...2b21bd614e0a97


If you found that the generic doesn't work for you & your dr noted in in your records -then maybe contact Merck directly with that information - perhaps they can place you on a list for the brand name supply.