Initiating antidepressant treatment in pregnancy: Timing, intensity, and influential maternal and familial factors.

Objective: To describe the timing and intensity of antidepressant initiation in pregnancy using longitudinal trajectories of antidepressant prescription fills to identify associated sociodemographic, lifestyle, somatic, mental health, pregnancy, and paternal factors.

Methods: This population-based cohort within the Norwegian Mother, Father and Child Cohort study linked to MoBa Genetics and the Prescribed Drug Registry included 1879 women with a new episode of self-reported depression/anxiety during pregnancy. Antidepressants were measured by week and average daily dose.