The Breeders' Cup board of directors voted Friday to keep a Lasix ban for juvenile events and decided to eliminate the juvenile sprint race from the two-day horse racing extravaganza.
The move maintains the same medical policies used last year for this year's event, set for November 1-2 at Santa Anita.
Horses in non-juvenile races will be allowed to race on Lasix, or furosemide, provided its use is approved by race officials and administered by approved veterinarians.
The diuretic is used in US racing to combat exercise-induced bleeding in the respiratory system.
The panel also called upon thoroughbred racing organizations to unite in studying the impact of medications upon horses.
"We recognize that there has been great divisiveness in our industry over medication rules, but joining together in the common goal of independent scientific research of the effects of race-day medications, coupled with industry pursuit of uniform rules, will move us toward eliminating such divisions," said Breeders' Cup chairman Tom Ludt.
"Our board feels this measure, keeping the policy in place for the Juvenile races and maintaining the 2012 policy on the remaining races, is the most practical course of action at this time."
The Cup also dropped the $500,000, six-furlong juvenile sprint event after two years, saying the event never lived up to desired standards.
"The number of starters and overall quality of the juvenile sprint fields for its two runnings did not meet the standards expected," Breeders' Cup chief executive Craig Fravel said.
"We also believe that the juvenile sprint had a negative impact on field sizes for both the Breeders' Cup juvenile and juvenile fillies.
"Even with the reduction from 15 to 14 races, we anticipate we will pay more than $25 million in purses and awards in 2013, more than last year."