Depends how it was stored, but probably.
It's probably fine. It might have even retained most of its potency. I would play it safe and assume it's still 100% potent if you try it.
As Slow Mobius said, at worst a slight loss of potency. I found some darvon's that were older than me on an abandoned property I was exploring. An admittedly lame drug to find, but some pals and I got nice and toasty with them. As a side note, the US Army did a study to investigate the effects of time on properly stored pharmaceuticals and they found that most retained potency even 30 years past the expiration date.