The mother’s milk provides the child by necessary nutrients, but also drugs, which the breast-feeding woman uses. Many drugs, which come into the mother’s milk, are potentially dangerous for the suckling. Most drugs, which the mother takes, may be determined in the mother’s milk, but the concentrations of drugs are generally lower than plasma levels of the drug in the mother. These concentrations are mostly tolerated by the child, but in spite of that even those amounts may exert untoward effects. The authors present a survey of untoward effects of drugs coming into the mother’s milk and recommendation for breast-feeding women.

        Key words: drugs, lactation