Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

noun. a compound which inhibits the synthesis of serotonin from tryptophan, generating an elimination of serotonin from brain cells.

PARACHLOROPHENYLALANINE: "Parachlorophenylalanine has been experimented with in regards to its effects as an SSRI, but it not approved as one at this point in time."

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