These costs are an average based on what Medicare beneficiaries paid out of pocket for a one month supply of the most common dosage.
If you are prescribed two or more doses each time you take your medicine, you will pay two or more times this amount.
This cost is based on what the Centers for Medicare and Medicaid Services paid for this medication in 2014 taken from prescription drug data for Medicare Part D beneficiaries.
This information is available at cms.gov.