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. 2006 Spring;11(1):11–38. doi: 10.1155/2006/642568

TABLE 15.

Opioids generally not recommended for treatment of chronic pain

Pentazocine (Talwin, Sanofi-Synthelabo Inc, Canada)
Meperidine hydrochloride (Demerol, Sanofi-Synthelabo Inc, Canada)
Propoxyphene hydrochloride (Darvon, AAIPharma Inc, USA)