Δ-9-Tetrahydrocannabinol (THC) crosses the placenta, is highly lipophilic, and can be detected in breast milk.1 National guidelines recommend abstinence from marijuana use during pregnancy and lactation, with limited data regarding the presence of THC in breast milk.2-4 We aimed to estimate the amount and duration of THC excretion in breast milk among women with known prenatal marijuana use.
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Wymore EM, Palmer C, Wang GS, et al. Persistence of Δ-9-Tetrahydrocannabinol in Human Breast Milk. JAMA Pediatr. 2021;175(6):632–634. doi:10.1001/jamapediatrics.2020.6098
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