Quetiapine Excretion Into Human Breast Milk

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Risk assessment of the use of quetiapine during breastfeeding is challenging owing to a paucity of data.


A pharmacokinetic study was conducted in lactating women who were taking quetiapine. The primary endpoint was to determine quetiapine concentration profiles in milk and estimated infant exposure levels. Multiple milk and a single blood quetiapine concentrations were determined using a highly sensitive liquid chromatography with tandem mass spectroscopy method.


Nine subjects receiving fast-release quetiapine (mean dose, 41 mg/d) were analyzed at steady state. The mean milk/plasma drug concentration ratio at 2-hour postdose was 0.47 (SD, 0.50; range, 0.13–1.67). The mean milk concentration of each patient was 5.7 ng/mL (SD, 4.5; range, 1.4–13.9 ng/mL). The mean infant quetiapine dose via milk per body weight relative to weight-adjusted maternal dose was 0.16 % (SD, 0.08; range, 0.04%–0.35%).


Infant exposure levels to quetiapine via milk are predicted to be very small.

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