Animal Drug User Fee Amendments of 2013

[AI summary unavailable — showing source text] Animal Drug User Fee Amendments of 2013 - Amends the Federal Food, Drug, and Cosmetic Act to extend for FY2014-FY2018 the authority of the Food and Drug Administration (FDA) to collect animal drug user fees, specifically new animal drug application or supplemental animal drug application fees, animal drug product fees, animal drug establishment fees, and animal drug sponsor fees. Revises the due date for annual user fees to the later of January 31 of each year or the first business day after enactment of an appropriations act providing for the collection and obligation of fees for the fiscal year. Establishes the amount of revenue such fees can generate. Specifies percentages of the total revenue that shall be derived from each type of user fee. Requires the Secretary of Health and Human Services (HHS) to adjust the total revenue amounts for FY2015 and subsequent fiscal years for inflation. Authorizes the Secretary to accept payment of user fees prior to their due date. Requires the total fees collected for FY2016-FY2018 to be increased by the cumulative amount, if any, by which the amount of user fees collected and appropriated for prior fiscal year falls below the cumulative amou…