Excluding nitroglycerin, insulin, and liquid antibiotics, most medications are long-lasting. Placing a medication in a cool place, such as a refrigerator, will help a drug remain potent for many years.

The expiration date is only an assurance that the labeled potency will last at least until that date. Ongoing research shows that stored under optimal conditions, many drugs retain 90% of their potency for at least five years after the labeled expiration date, and sometimes longer. Even 10 years after the expiration date many pharmaceuticals retain a significant amount of their original potency.
read more https://www.ncbi.nlm.nih.gov/pmc/articles/PMC70...

Still, I would dispose of medication that has expired if it was not too expensive and I could get replacement pills.

Is it safe to use expired medication?
No...maybe...it depends on who you ask
The need for expiration dates is rooted in the fact that medications degrade over time, as well as when exposed to external factors like light and humidity.
The FDA strongly discourages the use of expired medications because
the chemical composition and potency of a medication can change over time.
The true shelf life of a medication is complex, however.
Several studies, including ones conducted by the U.S. Department of Defense (DOD) and the FDA's Shelf Life Extension Program (SLEP), show that some medications remain effective well beyond their expiration date — with 88% of the 128 drugs tested through the SLEP remaining stable at least one year beyond their original expiration date.
So, to answer your question: Should you take expired Sinemet?
It probably won't harm you. It may not be as effective at controlling your symptoms as newer pills. If you can get new pills, it would be better to use them and throw out the expired pills.

How long is your Sinemet expired for? Bean

Sinemet is the brand name for the generic carb/levo

because i can't spell carbadopa levodopa