Phenylpiperidine is a chemical compound with a phenyl moiety directly attached to piperidine. There are a variety of pharmacological effects associated with phenylpiperidines including morphine-like activity or other central nervous system effects. Phenylpiperidine is a chemical compound with a phenyl moiety directly attached to piperidine. There are a variety of pharmacological effects associated with phenylpiperidines including morphine-like activity or other central nervous system effects.