The California Horse Racing Board, meeting at Betfair Hollywood Park May 24, approved a 21-day withdrawal period from the commonly used drug for any horse entered in a race. The move, which becomes effective with the start of the Del Mar summer meet July 18, will be in effect for one year.

The delay in instituting the change will give horsemen a chance to adjust their medication regimen. The previous withdrawal period for clenbuterol was 96 hours.

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The ban was enacted after CHRB investigators confiscated brands of clenbuterol not approved by the U.S. Food and Drug Administration at Los Alamitos, primarily as a muscle-building agent. Since the suspension of clenbuterol in Quarter Horses was instituted last November, there have been no violations, the CHRB reported.


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New rule will be in effect for one year, then evaluated.