13 Things to Know About Medication During Pregnancy — From a Medical Perspective

7. Teratogenic Medications and Absolute Contraindications

Certain medications carry such significant teratogenic risks that they are absolutely contraindicated during pregnancy, requiring immediate discontinuation upon pregnancy recognition and implementation of highly effective contraception for women of reproductive age taking these medications. Isotretinoin (Accutane) represents one of the most potent human teratogens, causing severe craniofacial, cardiac, and central nervous system malformations in 25-35% of exposed pregnancies, necessitating the iPLEDGE program that requires multiple forms of contraception and monthly pregnancy testing. Thalidomide, historically infamous for causing phocomelia, remains in use for certain cancers and inflammatory conditions but requires strict pregnancy prevention programs due to its devastating teratogenic effects. Methotrexate, widely used for autoimmune conditions and certain cancers, is a folate antagonist that causes multiple congenital anomalies and is absolutely contraindicated in pregnancy, requiring folate supplementation even in non-pregnant women to reduce toxicity. Warfarin crosses the placenta freely and causes warfarin embryopathy, characterized by nasal hypoplasia, stippled epiphyses, and central nervous system abnormalities, particularly with first-trimester exposure. ACE inhibitors and angiotensin receptor blockers (ARBs) cause severe fetal kidney damage, oligohydramnios, and growth restriction, particularly with second and third-trimester exposure, making them contraindicated throughout pregnancy. Valproic acid carries the highest teratogenic risk among antiepileptic drugs, causing neural tube defects, facial dysmorphism, and cognitive impairment, requiring careful consideration of alternatives in women of reproductive age. Certain chemotherapy agents, particularly alkylating agents and antimetabolites, carry high risks of fetal death and malformations, necessitating pregnancy avoidance and careful timing of conception after treatment completion. The management of patients taking these medications requires proactive counseling about pregnancy risks, implementation of effective contraception, and development of alternative treatment strategies for women planning pregnancy.

8. Mental Health Medications and the Risk-Benefit Balance

Mental health medications during pregnancy present particularly complex risk-benefit considerations, as untreated maternal psychiatric conditions can have profound effects on both maternal and fetal wellbeing, while medication exposure carries potential risks that must be carefully weighed against these consequences. Selective serotonin reuptake inhibitors (SSRIs) represent the most commonly prescribed antidepressants during pregnancy, with sertraline and citalopram generally considered first-line options due to extensive safety data, though paroxetine is avoided due to increased cardiac malformation risks. The decision to continue antidepressant therapy during pregnancy must consider the severity of maternal depression, history of previous episodes, response to non-pharmacological interventions, and the significant risks of untreated depression including poor prenatal care, substance abuse, preterm delivery, and postpartum depression. Third-trimester SSRI exposure has been associated with transient neonatal adaptation syndrome, characterized by jitteriness, poor feeding, and respiratory distress, but these symptoms are typically mild and self-limiting. Mood stabilizers present unique challenges, with lithium carrying first-trimester cardiac risks (Ebstein's anomaly) but potentially being the safest option for severe bipolar disorder when benefits outweigh risks, requiring specialized monitoring including fetal echocardiography. Antipsychotic medications show variable safety profiles, with older agents like haloperidol having more safety data than newer atypical antipsychotics, though quetiapine and olanzapine are increasingly used when treatment is necessary. Benzodiazepines are generally avoided due to potential teratogenic effects and neonatal withdrawal syndrome, though short-term use may be necessary for severe anxiety or panic disorders. The key principle in managing mental health during pregnancy is that maternal mental health directly impacts fetal development and pregnancy outcomes, making treatment decisions highly individualized and requiring close collaboration between obstetricians, psychiatrists, and patients to optimize outcomes for both mother and child.