My Darvocet prescription expired in 2/2011. What risk if I take now 4/2016?

I would be very careful because Darvocet's have been pulled from the shelves, discontinued. The U.S. Food and Drug Administration stopped the distribution/prescribing of Darvon/Darvocet in November of 2010 because scientific evidence has shown they can damage the heart or even cause fatal cardiac abnormalities. Darvocet contained a combination of propoxyphene and acetaminophen. Other Brand Names for Darvocet are: Balacet and Propacet 100. I would advise talking to a pharmacist first.
I didn't like them because they made my stomach hurt.