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DICP, The Annals of Pharmacotherapy: Vol. 23, No. 1, pp. 56-57.
© 1989 Harvey Whitney Books Company.
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Research Articles

Disopyramide and N-monodesalkyl disopyramide in serum and breast milk

AJ Ellsworth, Horn JR, VA Raisys, LA Miyagawa, and JL Bell

Maternal serum and breast milk were obtained to determine the concentration of disopyramide (DP) and its metabolite N-monodesalkyl disopyramide (NMD) from a woman requiring antidysrhythmic drug therapy. Infant serum and urine were also obtained for drug concentrations. DP 450 mg tid resulted in peak maternal serum concentrations of 4.0 micrograms/mL and 2.2 micrograms/mL for DP and NMD, respectively. Breast milk concentrations averaged 1.06 and 6.24 times the serum levels for DP and NMD, respectively. No DP was measurable in the infant's serum except for cord blood, which contained 0.7 micrograms/mL DP, 26 percent of simultaneous maternal concentration, and 0.9 micrograms/mL NMD, which represented 43 percent of the maternal concentration. Infant urine collected over an eight-hour period contained 3.3 micrograms/mL of DP and 3.7 micrograms/mL of NMD.


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Copyright © 1989 by Harvey Whitney Books Company.