Used primarily in medical settings to prevent preterm birth in pregnant women with a history of spontaneous preterm delivery. It works by supporting the uterus to maintain pregnancy, reducing the risk of early labor. Administered as an intramuscular injection, it is typically given weekly starting in the second trimester and continuing until week 37 of pregnancy or until delivery. It is also investigated for other hormonal conditions but is most recognized for its role in obstetrics. Always prescribed and monitored by healthcare professionals to ensure safety and effectiveness.