Fairness in Orphan Drug Exclusivity Act This bill limits which orphan drugs may be granted a market exclusivity period by the Food and Drug Administration (FDA). (Generally, an orphan drug is one that is not economically viable because of the rarity of the disease that it treats; the sponsor of an FDA-designated orphan drug may be granted various incentives, such as a seven-year period in which the FDA may not grant market approval to a different sponsor for the same drug to treat the same disease.) Under this bill, if a drug is designated as an orphan drug on the basis that there is no reasonable expectation that the sponsor will recover the costs of developing and distributing the drug from U.S. sales, the drug shall be granted the seven-year exclusivity period only if the sponsor demonstrates that there is no reasonable expectation that it will recover such costs specifically within its first 12 years of U.S. sales of the drug. This requirement shall also apply retroactively to an orphan drug that was granted such an exclusivity period before this bill's enactment. When deciding whether an orphan drug meets this requirement, the FDA shall consider the sales of all drugs from the sponsor that are covered by the same orphan drug designation.