How was PCP first discovered?
Answer: Parke, Davis & Company were searching for an efficient intravenous anesthetic. Animal studies showed that PCP was a good analgesic, but did not produce good muscle relaxation or sleep. Its first uses as a surgical anesthesia for humans indicated that PCP was a good analgesia without depressing blood circulation or respiration and it did not produce irregularities in heartbeat. Later the patients had no memory of the procedure. Therefore it was deemed medically safe for monkeys, but psychologically troubling for human use.
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