. Author manuscript; available in PMC: 2014 Nov 16.

Published in final edited form as: Cochrane Database Syst Rev. 2010 Sep 8;(9):CD007396. doi: 10.1002/14651858.CD007396.pub2

Analysis 15.1. Comparison 15 IM Avacan ® versus IM pentazocine, Outcome 1 Further analgesia required (nitrous oxide).

Review: Parenteral opioids for maternal pain management in labour

Comparison: 15 IM Avacan versus IM pentazocine

Outcome: 1 Further analgesia required (nitrous oxide)