New studies show no long term effects of antidepressant use during pregnancy, but risk of significant blood loss during childbirth is increased
News Sep 16, 2015
The use of antidepressants during pregnancy has no long term neurodevelopmental or behavioral effects on the child, however they may be associated with an increased risk of postpartum hemorrhage, suggests the findings from three studies published in BJOG: An International Journal of Obstetrics and Gynaecology.
Depression and anxiety are the most common mental health problems during pregnancy, with around 12% of women in the UK experiencing depression at some point during pregnancy and the postnatal period. The use of antidepressants such as selective serotonin reuptake inhibitors (SSRIs) to treat depression during pregnancy has become increasingly common, however, it is unclear whether any increased risk to the fetus, and health problems for the woman or baby, can be attributed directly to these drugs or may be caused by other factors. The research published today examines the effects of SSRI use on the health of both the mother and the long term development of the child.
A study from the Norwegian Institute of Public Health looked at the effects of prenatal exposure to SSRIs on motor skill development at 3 years old in 51,404 children from the Norwegian Mother and Child Cohort Study. In this cohort 159 mothers reported a prolonged use of SSRIs during pregnancy. Their children had a slight delay in the development of fine and gross motor skills compared to children unexposed during pregnancy. However, the authors of this paper acknowledge that the numbers are so small, no change in clinical practice is warranted.
Marte Handal, lead author of the study from the Norwegian Institute of Public Health said, “our results show that treatment with SSRIs during longer time periods in pregnancy was weakly associated with a delayed motor development at age 3. However, only a very small number of children had a severe delay. Even though we did take into account maternal symptoms of depression we still did not have complete information on the severity of the maternal depression in the different groups. Effective treatment of depression during pregnancy is essential and these results should not discourage healthcare professionals from prescribing or continuing antidepressant treatment to those who need it.”
In another study, an Australian team analyzed data from 49,000 women registered on the Danish National Birth Cohort, to examine the impact of prenatal exposure to SSRIs on behavioral problems at aged 7 years. Results found that untreated prenatal depression (231 children) was associated with an increased risk of problem behavior in the children, hyperactivity, inattention, and peer problems. This increased risk was not seen in the children (210 children) whose mothers took antidepressants, including SSRIs.
In a separate study, the same team examined the risk of postpartum hemorrhage (the loss of between 500 and 1,000ml of blood within the first 24 hours after giving birth) in mothers taking antidepressants in the final 3 months of their pregnancy, at the Women's and Children's Hospital in Adelaide, Australia. For women without psychiatric illness (28,000 women) or who were not taking antidepressants (1,292) the risk of postpartum hemorrhage was 11%. This increased to 16% for women taking antidepressants (558). Risk of severe postpartum hemorrhage and of postpartum anemia were almost doubled by SSRI use.
Dr Luke Grzeskowiak, lead author of the studies from The University of Adelaide, Australia, said, “it is reassuring to find that prenatal exposure to antidepressants did not affect a child’s behaviour at age 7, however as with any medication, the benefits and risks but always be considered.
"Regarding our other study, overall the risks for postpartum hemorrhage are largely unknown. We found separate increases in risk with placenta previa, prolonged labor, hypertension and assisted vaginal delivery, as well as the increased risk seen with antidepressant use. However we did not have data on known risks such as use of oxytocin during delivery, nor did we have any data on the severity of the underlying maternal psychiatric illness. Consequently, it is possible that the women who took antidepressants late in pregnancy were those with the most severe illness and it is this which is responsible for the increased risk of postpartum hemorrhage and not the antidepressant. Based on this study alone we do not recommend that women stop taking medication for depression during pregnancy, but are closely monitored in order to reduce the risk of any potential increased risk of bleeding as much as possible.”
"These studies add to a growing body of evidence about the safety of taking antidepressants during pregnancy. While there are some increased risks, the evidence so far seems to be that the risks of untreated depression outweigh the risks of taking them. But the more we understand the better prepared the medical profession will be to help women through their pregnancy and birth."
John Thorp, BJOG Deputy Editor-in-chief said, "these studies add to a growing body of evidence about the safety of taking antidepressants during pregnancy. While there are some increased risks, the evidence so far seems to be that the risks of untreated depression outweigh the risks of taking them. But the more we understand the better prepared the medical profession will be to help women through their pregnancy and birth."
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Selmer W et al. Motor development in children prenatally exposed to selective serotonin reuptake inhibitors: a large population-based pregnancy cohort study. BJOG: An International Journal of Obstetrics & Gynaecology, Published Online September 15 2015. doi: 10.1111/1471-0528.13582
Pederson LH et al. Prenatal antidepressant exposure and child behavioural outcomes at 7 years of age: a study within the Danish National Birth Cohort. BJOG: An International Journal of Obstetrics & Gynaecology, Published Online September 15 2015. doi: 10.1111/1471-0528.13611
Clifton VL et al. Antidepressant use in late gestation and risk of postpartum haemorrhage: a retrospective cohort study. BJOG: An International Journal of Obstetrics & Gynaecology, Published Online September 15 2015. doi: 10.1111/1471-0528.13612