Women with MS who choose to go on interferon beta drugs are advised to stop treatment if they decide to try to become pregnant. This advice is based on data from animal studies that suggest these drugs may increase the risk of miscarriage. However, since animal studies are imperfect substitutes for human experience, a group of doctors decided to pore through pregnancy data collected during eight IFN-b trials to determine whether being on the drug did have an impact on pregnancy outcome. They found that IFN-b did appear to slightly increase the risk of miscarriage but not to a significant degree.
Overall, these data i"
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