SPAM-sub partual analgesia with meptazinol: a prospective cohort study comparing intramuscular with intravenous administration.

Meptazinol significantly reduces labor pain regardless of the method of application: intramuscular or intravenous. According to our data, no preferable route could be identified. The comparably poorer perinatal outcome in our study cohort hinders us to confirm that meptazinol is safe and can be recommended without restrictions.