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

Purpose: Safe and effective analgesia sub partu is one of the central issues in optimizing vaginal delivery birth experiences. Meptazinol is a common opiate approved for treating labor pain in the first stage of labor. According to the manufacturer, manual meptazinol can be applied intramuscularly or intravenously.