These two drugs have exactly the same chemical formulation but made it is made by different companies. X is a brand drug costing me at least 400 dollars a month as a tier 3 drug. X2 came out about six months ago and should have been listed as a generic which it is (20 year run out on the patent)...but Optum RX listed it as a tier 4 drug because it might not be affective. But the ingredients are the same for X and X2!!!!! It should have been listed as a generic drug at tier 2 which is much less expensive. For Premera X2 is a tier 2 generic drug costing $12 dollars copay!!!!!
Be careful Optum RX manipulates Tiers to their financial benefit.