Which type of medications are contraindicated in breastfeeding?

Radioactive drugs are contraindicated in breastfeeding due to their potential to emit radiation, which can be transferred to the infant through breast milk. The exposure of a breastfeeding infant to radiation can pose significant health risks, including the possibility of cancer and developmental issues. Since radioactive substances can accumulate in the body and breast milk, it is essential for breastfeeding mothers to avoid these medications. Health professionals typically advise nursing mothers to discontinue breastfeeding for a specified time after receiving radioactive drugs, allowing their bodies enough time to eliminate the radioactive materials before resuming breastfeeding.

In contrast, the other types of medications listed, such as herbal supplements, local anesthetics, and nutritional supplements, may have varying degrees of safety and potential effects on breastfeeding, but they do not inherently carry the same level of risk as radioactive drugs when it comes to breastfeeding an infant.