DO NO used "Worry Free Refills" with Medco / Express-Scripts. They will ship the drugs and bill you long before you need them. I have enough drugs to last till July and I am only to have a 3 month supply.
In November I canceled the Automatic "Worry Free Refills" on all of my scripts. I got two new scripts today and my AmEx was billed $ 123.00
From now on I will dispute any charges to my AmEx. AmEx will stop paying, and sooner or later Medco / Express-Scripts might stop sending me drugs I do not need.