Copay coupons and discount cards could soon be seeing the end of their day as pharmacy benefits managers (PBMs) put their foot down. Last year, Express Scripts ($ESRX) made waves by excluding 48 products from its national formulary, including some Big Pharma up-and-comers, targeting those with copay discounts. Now, United Healthcare ($UNH) has widened its stamp-out-coupons pilot program to cover 25 additional drugs, and some smaller PBMs and insurers are following suit with similar moves. More