Related Experiment Video
Updated: Apr 8, 2026

Analysis of Electrocardiograms and Behavior in Mice from Pregnancy to Lactation Period
Published on: April 5, 2024
An overview of upcoming changes in pregnancy and lactation labeling information
Juan F Mosley1, Lillian L Smith2, Megan D Dezan3
1Florida Agricultural & Mechanical University . Tallahassee, FL ( United States ). juan.mosley@famu.edu.
Background:
Many medications can be used safely and effectively to provide health benefits for disease state management during pregnancy with minimal risk to the fetus or mother. Today nine out of ten women take at least one medication during pregnancy, and the number of women taking four or more medications has more than doubled over the past 30 years. However, the lack of safety data combined with the generalizations of the current risk category system (A, B, C, D, X) makes risk versus benefit assessment difficult.
Discussion:
In response to these concerns, the U.S. Food and Drug Administration (FDA) has decided to implement a new pregnancy and lactation labeling rule designed to improve risk versus benefit assessment of drugs used in pregnant and nursing mothers; this rule is set to take effect in June of 2015. This change is designed to provide clear and detailed information for both patients and healthcare providers pertaining to three main categories: pregnancy, lactation, and females and males of reproductive potential. The new labeling rule also removes the previous letter risk categorization system.
Conclusion:
The upcoming changes regarding pregnancy and lactation safety labeling are going to have a vast impact on drug safety interpretation and prescribing practices. While this rule will provide practitioners with more detailed information pertaining to pregnancy, lactation, and reproduction, it will also place more responsibility on the practitioners to ensure the safety of their patients. This review will summarize these changes and discuss their potential effect on clinical practice.
Related Concept Videos
FDA Approved Drugs: Changes to Approved Drugs
Hormonal Regulation of the Menstrual Cycle
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...
Development of the Oral Microbiota
Teratogenicity
Drug Regulation
Development of Human Microbiota

