Check with your doctor or the pharmacist for a savings card for the drug. You have to call to activate the card. They will ask a few questions to see if you qualify for the savings card. Certain RX plans are not included for the savings card.
You can also check on the drug manufactures web site for the specific medication. There may be a registration area.
The company will direct you on how the RX should be billed by the pharmacy. Usually commercial insurance is billed first and then the savings plan card.
There may also be a 800 number available.
Hope that helps.