Drugs in Pregnancy By Ravindu Gunatilake, MD, Valley Perinatal Services; Avinash S Patil, MD, University of Arizona College of Medicine Reviewed / Revised Mar 2021 | Modified Sep 2022 View Patient Education Vaccines During Pregnancy Antidepressants During Pregnancy Antivirals During Pregnancy Social and Illicit Drugs During Pregnancy More Information Topic Resources Some Drugs With Adverse Effects... Drugs are used in over half of all pregnancies, and prevalence of use is increasing.