With a 20-mg intake of amphetamines daily, levels of 55-138 |ig/l were detected in breast milk. An M/P ratio ranging from 2.8 to 7.5 was calculated (Steincr 1984). A relative infant dose of up to 3% would result from these values. Another study could not find any symptoms among 103 infants whose mothers took various amounts of amphetamines (Ayd 1973).
Two publications report on phencyclidine in breast milk (Kaufman 1983, Nicholas 1982). However, these data are insufficient to assess its risk. There is insufficient experience with other drugs of abuse during breastfeeding.
Recommendation. If a mother regularly takes amphetamines or abuses other drugs, she should not breastfeed.
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