What defining characteristic is associated with drugs classified as Category C?

Drugs classified as Category C are characterized by showing risk in animal studies where the effects indicate potential harm, but there are limited human data available to fully understand the implications of their use during pregnancy. This means that while animal research may suggest a risk to the fetus, human studies have not definitively established how these drugs affect human pregnancies.

This classification reflects the need for caution when prescribing these medications to pregnant women, as the potential benefits may need to be weighed against the risks determined from animal studies. Unlike Category A drugs, which are proven to be safe based on extensive research, or Category X drugs, which are contraindicated in pregnancy due to known risks, Category C requires careful consideration by healthcare providers. This understanding is crucial in guiding medication choices and ensuring patient safety during pregnancy.