Prospective Evaluation of Pregnancy Outcomes after Gestational Exposure
to Prazosin
Abstract
Introduction: Prazosin is an antihypertensive medication which can be
used to help with post-traumatic stress disorder (PTSD) symptoms. Little
data is currently available on its safety in pregnancy. Objective: To
assess the fetal and pregnancy safety associated with Prazosin exposures
in early Pregnancy. Methods: Subjects were 11 patients who took Prazosin
during pregnancy and were counselled at the FRAME clinic in London
Health Sciences Centre (Ontario, Canada) between January 1, 2000 to
December 31, 2021. Data on their other exposures and pregnancy outcomes
were collected from medical records and through telephone
questionnaires. Results: It was found that 6 /11 (54.5%) subjects did
not report any adverse outcomes and were uneventful pregnancies. There
were 2 miscarriages. Birthweights were within the normal range for the
remaining 9 pregnancies. Adverse events reported were consistent with
background population expectation, including: 1 postpartum hemorrhage, 1
case of preeclampsia, 1 preterm birth, 2 NICU admissions, and 2
caesarean sections. Discussion / Conclusion: For these 11 subjects,
pregnancy outcomes after exposure to Prazosin were consistent with
typical outcomes from unexposed pregnancies. More data are needed to
conclude that Prazosin is safe for use in pregnant subjects. However,
the lack of adverse effects above baseline is reassuring to future
patients who may be unintentionally exposed to Prazosin while pregnant.
Therefore, this study contributes valuable data toward monitoring safety
of Prazosin in Pregnancy.