Assertion: ephedrine's effect | /r/AtLocation | patient
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text: Drowsiness, dissociation, and psychosis-like effects (e.g., hallucinations, delirium) are reported in patients treated with ketamine starting at circulating concentrations of around 50 to 200 ng/mL (210–841 nM), while analgesia begins at levels of approximately 100 to 200 ng/mL (421–841 nM).