Women who are pregnant or thinking about becoming pregnant should consult with a physician before using any medications, supplements or recreational drugs. Although many prescription and over-the-counter drugs can be used safely during pregnancy, others can have harmful effects on the developing fetus or the natural course of the pregnancy.

Herbal remedies, supplements and recreational drugs – including legal (such as alcohol and nicotine) and illegal (such as marijuana and cocaine) substances – can also have negative impacts when used during pregnancy.

No medicines have been proven absolutely safe for use during pregnancy, according to the U.S. Department of Health and Human Services. However, many drugs are thought to be safe, and some may be beneficial during pregnancy. In addition, some medications and supplements should not be taken while breastfeeding as they can be transferred through breast milk to the baby. Women should consult with their physician when deciding which drugs are and are not safe to take during pregnancy and breastfeeding.