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. |