Book excerpt: Preterm birth (i.e. birth before 37 completed weeks of gestation) is the leading cause of neonatal mortality globally. Preterm newborns that survive are at an increased risk of a number of short- and long-term adverse health outcomes, including chronic lung disease, infections and neurological, visual and auditory disabilities. A number of tocolytic agents are currently in use internationally to slow down or stop the progression of labour. However, none of those has shown substantive improvements in fetal or newborn health outcomes.There is an urgent need for new agents to manage preterm birth, thereby reducing adverse outcomes for newborns. An initial target product profile (TPP) for drugs to manage preterm labour was developed and published by external parties. Following the identification of an unmet public health need, WHO has considered the already published TPP as the basis for developing a WHO TPP. The purpose of this TPP is to guide product developers and funders on the key characteristics and desired attributes of therapeutic agents for pregnant women experiencing spontaneous preterm labour.