Drug Toxicity Ratings

Medications are classified according to how much risk they pose to a developing baby. (The higher the letter, the greater the risk.)

Toxicity Rating Risk
A Drugs, which are not toxic to humans.
B Drugs, which does not show any significant risk or adverse effects in animal or human studies.
C Drugs in which no adequate animal or human studies are carried out, or adverse effects are shown in animal studies and no human study data available.
D Drugs with evidence of risk to the fetus but benefits outweigh the risk of the drug.
X Drugs with proven risk to the fetus.

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