The use of Clenbuterol to produce relaxation of the myometrium during caesarean operation in cattle.

The tocolytic drug Clenbuterol was clinically tested as a means of producing relaxation of the myometrium to facilitate exteriorisation of the uterus during Caesarean operation in 17 cows. When myometrial tone was found to be high during surgery, the intravenous injection of 10 ml of Clenbuterol resulted in a lowering of tone in less than 3 min allowing easy exteriorisation of the uterus. Alternative methods of myometrial relaxation are compared.