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Ketamine is a unique intravenous or intramuscular agent used for both analgesia and anaesthesia. It is a phencyclidine derivative. It takes a longer period than other intravenous anaesthetics before its non-hypnotic effects are maximal. Similarly, recovery is delayed. Effects include:
It is contraindicated in those with hypertension, a history of stroke, or a significant psychiatric history, but it may be useful for uncooperative patients.