Crohn's disease and ulcerative colitis, referred to as inflammatory bowel disease (IBD), are chronic, relapsing conditions. Patients are often diagnosed at a reproductive age, and therefore questions about fertility and reproductions often arise. Preconceptional counseling is the most important aspect in the management of IBD patients with a pregnancy wish.
Patients should be counseled on the influence of IBD and IBD drugs on pregnancy. Most drugs are not related to adverse outcome while used during pregnancy. Active disease is related to adverse outcomes; therefore, it is of utmost importance to strive for remission before conception and during pregnancy.

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Digestive Diseases: clinical reviews
Department of Gastroenterology & Hepatology

Kanis, S., & van der Woude, J. (2016). Proper Use of Inflammatory Bowel Disease Drugs during Pregnancy. Digestive Diseases: clinical reviews, 34(1), 61–66. doi:10.1159/000447377