Medicine is given to start labor without a medical reason. Lower is better.
Labors that are started by medicine, or induced, are more likely to end in a c-section which has a greater risk for complications for both the mother and baby.
Patients with elective vaginal deliveries or elective cesarean sections at >= 37 and < 39 weeks of gestation completed: https://manual.jointcommission.org/releases/TJC2013A/MIF0166.html