Pentazocine

The effort to find an effective analgesic with less dependence-producing consequences led to the development of pentazocine (Talwin®). Introduced as an analgesic in 1967, it was frequently encountered in the illicit trade, usually in combination with tripelennamine and placed into Schedule IV of the CSA in 1979. An attempt at reducing the abuse of this drug was made with the introduction of Talwin Nx®. This product contains a quantity of antagonist (naloxone) sufficient to counteract the morphine-like effects of pentazocine if the tablets are dissolved and injected.