Emerging tocolytics: challenges in designing and testing drugs to delay preterm delivery and prolong pregnancy

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Pharmacology

Background:

• Global preterm delivery rates are increasing, posing significant risks for neonatal mortality and long-term pediatric morbidity.
• Current interventions to prevent preterm labor focus on inhibiting myometrial contractions, often using repurposed drugs.
• Developing novel therapeutics for preterm birth is hindered by financial and practical barriers.

Purpose of the Study:

• To review current and emerging strategies for preventing preterm labor and maintaining pregnancy.
• To identify challenges in developing and testing new tocolytic agents.
• To explore the potential of existing drugs for pregnancy maintenance.

Main Methods:

• Literature review of current tocolytic therapies and novel approaches.
• Analysis of barriers to new drug development for preterm labor.
• Discussion of complexities in designing clinical trials for tocolytics.

Main Results:

• Existing tocolytic drugs were often developed for other conditions.
• Newer strategies focus on maintaining uterine quiescence to prevent preterm labor.
• Clinical trial design for tocolytics is complex due to dual patient health considerations and varying outcomes based on gestational age.

Conclusions:

• Effective prevention of the increasing preterm delivery rate remains a critical unmet need.
• Repurposing existing drugs may offer a viable path for pregnancy maintenance.
• Overcoming financial, practical, and clinical trial design hurdles is essential for advancing preterm birth prevention.