An orphan drug is a drug that is

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An orphan drug is a drug or biologic product for the diagnosis or treatment of a rare disease.Rare is defined as a disease that affects less than 200,000 persons in the United States.Alternatively,a drug may be designated as an orphan if used for a disease that affects more than 200,000 persons in the United States but for which there is no reasonable expectation of recovering the cost of drug development.Orphan drugs are often quite expensive to produce because they have a limited market in which to recoup the initial investment.

An Orphan Drug Is a Drug That Is