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NEW YORK (Reuters Health) – If you take antidepressants such as fluoxetine (marketed as Prozac) early in your pregnancy, you may be doubling the risk that your newborn will be born with a heart defect, according to a new study.

However, the vast majority of children born to women who take such antidepressants – known as selective serotonin reuptake inhibitors (SSRIs) – do not have such defects, the researchers are quick to note.

Earlier studies have tied SSRIs during pregnancy to heart defects, but also to even more serious birth defects. According to the new study of nearly half a million children born in Denmark between 1996 and 2003, however, only heart defects are likely to be associated with the antidepressants, note co-author Dr. Lars Henning Pedersen, from Aarhus University, Denmark, and colleagues.