Hydroxychloroquine - safety in pregnancy

Hydroxychloroquine (HCQ) is an antimalarial drug containing a 4-aminoquinoline radical, with immunomodulatory, antioxidant, anti-inflammatory and vascular protective effects, which is widely used in the treatment of various rheumatological conditions and is also compatible with pregnancy. It is well known that hydroxychloroquine crosses the placental barrier and hence it can protect against adverse perinatal outcomes, such as congenital heart block in fetuses of anti-SSA/Ro positive mothers. When it is administered at daily doses inferior or equal to 400 mg, HCQ is not associated with augmented risk of perinatal morbidity and it has also been found to prevent disease flares among pregnant women with systemic lupus erythematosus (SLE) or rheumatoid arthritis (RA), improving maternal outcomes and being protective toward fetal health as well. However, the concerns about its safety in pregnancy are still present because studies on the risks of perinatal defects associated with HCQ administration arise sparse and have controversial results. The purpose of the current article is to make a review of the medical literature concerning the safety of HCQ in pregnancy. For this purpose, scientific research in online medical publications such as Elsevier, PubMed, and The Lancet, was conducted.