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What happens if a drug covered by my Medicare drug plan is found to be unsafe?

Understanding your Formulary · updated Jun 20, 2016

If a drug is found to be unsafe, it will no longer be covered. You will get a written notice from your plan of why the drug is no longer covered, a list of other drugs that are the same type that may be used in its place, and the expected cost. Talk to your doctor about what drug you should take.

(Source: U.S. Department of Health & Human Services)