The amount of drug excreted in breast milk is usually 1% to 2% of the maternal dose.It is likely that most drugs taken by the lactating mother will have pharmacologic significance for the infant.

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While it is true that the amount of drug excreted in breast milk is usually 1% to 2% of the maternal dose, it is not accurate to say that most drugs taken by the lactating mother will have pharmacologic significance for the infant. Many factors, including the dose, the drug's properties, and the infant's age and health, influence whether a drug will have a significant effect.

The Amount of Drug Excreted in Breast Milk Is Usually