We investigated the σ1 pharmacological profile of Phenazocine enantiomers. We improved the plethora of information about the analgesic activity of Phenazocine. We employed phenytoin as σ1 receptor positive allosteric modulator. PRE-084 unmasked σ1 antagonistic component of (+)- and (−)- phenazocine. (+) and (−)-Phenazocine display σ1 antagonist activity and opioid analgesia.