Although PCP was tested on humans, it was eventually adopted primarily for use in animals as an anesthetic and also in so-called "tranquillizer" guns.

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PCP, initially developed and tested for human use as an anesthetic, was found to have significant side effects including hallucinations and delirium. Due to these adverse effects, its use in humans was discontinued, and it was instead adopted for veterinary use, including in tranquilizer guns for immobilizing animals.

Although PCP Was Tested on Humans, It Was Eventually Adopted