Injectable Talwin, which contains the active ingredient pentazocine, is used in horses to relieve moderate to severe pain. Pentazocine is an opioid analgesic that acts on opioid receptors in the central nervous system to reduce pain perception and response.

It is used to treat pain associated with injuries, surgeries, colic, or any other painful condition in horses.

It is important to use this medication under the supervision and prescription of a qualified veterinarian, following the proper directions and dosage.