Shelly had her prescription filled on October 23, 2012. The medication had a manufacturer’s expiration date of November 30, 2013. When does Shelley’s medication expire, and why? October 23, 2013, because the expiration date is a year from when the prescription is filled and before the manufacturer’s date. October 23, 2013, because the prescription fill date is always earlier than the manufacturer’s date. November 30, 2013, because the expiration date is the later date between the prescription date and manufacturer date. November 30, 2013, because the manufacturer expiration date is always used as the expiration date.