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Parental Levels. A female receiving long-lasting dental colchicine 0.6 mg daily had milk degrees of colchicine gauged 5 times in between 16 and 21 days postpartum. Two times, colchicine was undetected (<0.5 mcg/L) in milk 40 minutes after a dose. On other occasions, milk colchicine levels were 1.2 mcg/L 40 minutes after a dose, 2.5 mcg/L 50 minutes after a dose and 1.7 mcg/L 55 minutes after a dose.
A woman taking colchicine 1 mg orally once daily had breastmilk colchicine levels of 31 mcg/L at 2 hours after a dose and 24 mcg/L 4 hours after the dose on day 5 postpartum; and 27 mcg/L at 4 hours after the dose and 10 mcg/L at 7 hours after the dose on day 15 postpartum. Using the maximum milk level, the authors estimated that an exclusively breastfed infant would receive 10% of the maternal weight-adjusted dosage in the 8 hours after a dose. They suggested giving colchicine at nighttime and not nursing for 8 hours to minimize infant colchicine exposure.
Four women were receiving long-term colchicine therapy 1 to 1.5 mg once daily. Milk samples were taken before and 1, 3 and 6 hours after a colchicine dose on days 4, 6, 21 and 58 of nursing, respectively, in the 4 women. Colchicine was detectable in all milk samples, including the 24-hour pre-dose samples which were less than 1 mcg/L. Peak milk levels occurred 1 hour after the dose in 3 women and 3 hours after the dose in the fourth. Peak milk levels ranged from 1.98 and 8.6 mcg/L. At 6 hours after the dose, milk levels ranged from 0.87 and 2.57 mcg/L. Although the authors did not specify which mothers were taking which dose, milk levels were much higher (>1.5 times greater) in the moms who were 4 as well as 6 days postpartum as compared to those who were 21 and 58 days postpartum. Making use of the greatest determined milk degrees, the writers approximated that a solely breastfed infant would get 1.2 mcg/kg daily or less than 10 % of a grown-up colchicine dosage.