Standard IV infusions are 40 minutes, although patients may stay for up to 90 minutes to allow for effects to wear off. Onset is 4 minutes, duration about 40 minutes, and expect 2-3 hours for the effects to dissipate. Intramuscular injection effects are immediate since the entire dose of ketamine is given at one time. These patients may leave when they choose although we encourage staying at least 40 minutes after injection.
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