What should I do if my doctor prescribes a drug that isn't on the preferred drug list?

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You might want to ask your doctor to look at the preferred drug list. He or she may not be aware of an equivalent drug that’s available on the Express Scripts preferred drug list. If you and your doctor still want the non-preferred drug, it’s covered, but at the higher non-preferred, brand-name copay, which is still a significant savings over paying the full retail price.