My Propecia Has Not Expired But Should I Be Worried?

I recently filled a prescription for finasteride at Costco and noticed the manufacturing date was from a year ago (9/2014). The expiration date is 8/2016. Even though it hasn’t expired, should I be concerned that it might’ve been sitting around in a warehouse (either Costco’s or the manufacturer’s) for a year?

It’s Aug 2015 (not 2016) so your propecia has not expired yet.  If you are concerned about the potency, just go back to the pharmacy for a new prescription.  There is a reason why there is an expiration date and a manufacturing date.  As long as you follow direction and use it before the expiration date, you should be fine.