Toxicology studies provide the basis for which classification in humans?

• A. Drug interaction categories
• B. Age-based dosing schedules
• C. Pregnancy categories
• D. Formulation types

Answer: (C)

Toxicology data assess how a drug might affect a developing fetus, including teratogenicity and fetal toxicity seen in animal studies. When human data are limited or unavailable, these animal findings help determine potential fetal risk and guide labeling with pregnancy categories, which indicate how safe a drug is to use during pregnancy. That is why toxicology studies provide the basis for pregnancy classifications in humans. Drug interaction categories come from interaction studies, age-based dosing from pediatric pharmacokinetics, and formulation types come from formulation development, not toxicology data.