Halothane should always be given through a calibrated vaporiser. This can be remedied either by washing the vaporiser through with ether or stripping and cleaning if you have the facilities. This becomes expensive and may also be unsafe. I would never use this method, though many do and get away with it, probably because heart disease is so uncommon in Africa. A common arrangement is to have two draw-over vaporisers in series containing halothane and trichloroethylene, with the halothane nearest the patient.
Supplementary oxygen is mandatory when using halothane to avoid hypoxia.
In a study recently conducted in Malawi, halothane accounted for one quarter of the entire anaesthetic department budget.