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In page Clenbuterol:

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Clenbuterol is administered as an aerosol for the treatment of allergic respiratory disease in horses as a bronchodilator, and intravenously in cattle to relax the uterus in cows at the time of parturition[1], specifically to facilitate exteriorisation of the uterus during Caesarian section surgery. It is licensed for obstetrical use in cattle as Planipart Solution for Injection.[2]