Don't be surprised if you get a letter from Express Scripts stating that one of the medications you are taking will have it's patent expire soon. And, when that happens, you will have to buy the generic brand in order to receive the lower price. If you must buy the brand name, you will have to still pay the co-pay, BUT you will also have to pay the difference between the generic brand price and the brand name product's price.
I believe that's the way it will be figured. If anyone know otherwise, please let us know.