New York regulators on Nov. 24 enacted the most sweeping set of equine drug rules in more than 30 years in the state, providing a more certain threshold for allowable amounts of medication from two dozen different drugs in Thoroughbreds prior to running in a race.

The state Gaming Commission's approval of the final set of highly detailed rules comes a year after the agency first proposed adding specification levels for the drugs to New York's long-standing "time-based'' medication rules.

The agency says the new rules are intended "to protect the integrity of the pari-mutuel wagering system'' in the state as well as the health of horses,'' said Robert Williams, the Gaming Commission's executive director.

The rules will take effect Jan. 1, 2015