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Many people run into pregnancy medications categories like A, B, C, D, and X while researching prescriptions, mental health meds, or withdrawal support during pregnancy.

These letters can look simple, but they are easy to misunderstand. This guide explains what each category means, what it does not mean, and what the FDA uses now instead.

This article is educational and not medical advice. If you are pregnant (or could be), review every medication decision with a qualified clinician.