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IM Ketamine is safe and predictable which is a bonus for children, the other advantage being that one doesn't have to cannulate! Atropine is recommended (0.01/kg) to reduce salivation reactions, but I have seen colleagues who haven't used atropine.
I myself have used IM Ketamine for children for a variety of procedures for the past 8 yrs or so and am happy with it; so are my colleagues in my department. It saves us transferring the patient to a specialist just for GA and the patient is sorted within a single episode.