For administration by inhalation. HALOTHANE-VET may be administered using either open, semi-open or closed circuit systems. Closed circuit systems and endotracheal intubation should be used whenever possible.

Induction: Anaesthesia is induced by using a concentration of Halothane in the range 2-4%. Alternatively a short acting induction agent (such as thiopentone sodium) may be used, and is to be preferred in large or excitable subjects.

Maintenance: Once a surgical plane of anaesthesia is reached, it may be maintained by a reduced concentration of between 0.5 and 2% depending on the size of the animal and the method used.

Induction: It may be possible to administer Halothane to a standing foal using a Cox mask but, as it is normally not practicable to induce anaesthesia in large animals using Halothane, induction should be by the use of a short acting intravenous agent such as thiopentone sodium. A concentration of 5-8% Halothane may then be used to complete the induction of surgical anaesthesia in 5-10 minutes.

Maintenance: Anaesthesia may be maintained by the administration of 0.8-2% Halothane vapour. Depending on the fresh gas flow-rate, to give this concentration to the animal it is usually necessary to deliver 1.5-5% from any out of circuit vaporiser, at least for the first hour.