Drug use before and during pregnancy requires special considerations, since medications have the potential to affect the developing fetus. In addition, pregnancy alters pharmacokinetic parameters of some medications, resulting in a need for dosage adjustment. Drug regimens for management of acute and chronic disorders in pregnancy should be tailored to optimize the health of the mother while minimizing risk to the fetus. After delivery, measures should be taken to minimize drug exposure to the breastfeeding infant. Pharmacists can play a key role in maximizing the safe and effective use of medications during pregnancy and lactation.
Preconception care should be discussed with all women of childbearing age. The goal of preconception care is to minimize poor pregnancy and improve fetal/infant and maternal outcomes. Elements of preconception care include supplementation, dietary considerations, immunizations, and management of chronic diseases.
Vitamin and Mineral Supplementation
Folic acid deficiency is a major cause of neural tubal defects (NTDs), and adequate intake of folic acid can reduce the incidence of NTDs by 50% to 70%. Women of childbearing age should be advised to take a multivitamin (MVI) with 400 to 800 mcg of folic acid daily, as formation of the neural tube occurs in the first 4 weeks of pregnancy, before a woman knows she is pregnant. Higher doses (4-5 mg daily) are required for women with an increased risk of delivering a child with NTDs (eg, women taking antiepileptic medications). Supplementation should be initiated at least 1 month before conception and continue throughout the first trimester.
Multivitamins offer additional benefit in meeting calcium (1000-1300 mg) and iron requirements. Calcium is important for bone health of the mother and fetus, and may reduce the risk of preeclampsia. Additional calcium supplementation with calcium carbonate or citrate may be needed if MVI and dietary intake is insufficient. The Centers for Disease Control and Prevention (CDC) recommends supplementation with 27 mg/d of elemental iron to support the increased demands of pregnancy. All pregnant women should be screened for iron deficiency anemia; those requiring additional supplementation should be given 60 to 120 mg/d of iron.
Caffeine consumption may increase risk of miscarriage and low birth weight. Low to moderate amounts of caffeine (<200 mg/d) appear to be safe. Seafood contains long-chain omega-3 polyunsaturated fatty acids and mercury. Fatty acids are beneficial to the central nervous system, but mercury can lead to birth defects. It is recommended to limit intake to 12 ounces of seafood with lower mercury content per week. Alcohol consumption may contribute to complications during pregnancy and cause fetal alcohol syndrome (physical, behavioral, and cognitive abnormalities) in infants. No level of alcohol consumption is considered safe during pregnancy.
Ideally, immunizations should be up to date before conception. Inactivated vaccines ...