• Am. J. Med. · Aug 2014

    Randomized Controlled Trial

    Risk of hypercalcemia in blacks taking hydrochlorothiazide and vitamin D.

    • Paulette D Chandler, Jamil B Scott, Bettina F Drake, Kimmie Ng, John P Forman, Andrew T Chan, Gary G Bennett, Bruce W Hollis, Edward L Giovannucci, Karen M Emmons, and Charles S Fuchs.
    • Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Mass; Harvard Medical School, Boston, Mass. Electronic address: pchandler@partners.org.
    • Am. J. Med. 2014 Aug 1; 127 (8): 772778772-8.

    IntroductionHydrochlorothiazide, an effective antihypertensive medication commonly prescribed to blacks, decreases urinary calcium excretion. Blacks have significantly higher rates of hypertension and lower levels of 25-hydroxyvitamin D. Thus, they are more likely to be exposed to vitamin D supplementation and thiazide diuretics. The risk for hypercalcemia among blacks using vitamin D and hydrochlorothiazide is undefined.MethodsWe assessed the frequency of hypercalcemia in hydrochlorothiazide users in a post hoc analysis of a randomized, double-blind, dose-finding trial of 328 blacks (median age 51 years) assigned to either placebo, or 1000, 2000, or 4000 international units of cholecalciferol (vitamin D3) daily for 3 months during the winter (2007-2010).ResultsOf the 328 participants, 84 reported hydrochlorothiazide use and had serum calcium levels assessed. Additionally, a comparison convenience group of 44 enrolled participants who were not taking hydrochlorothiazide had serum calcium measurements at 3 months, but not at baseline. At 3 months, hydrochlorothiazide participants had higher calcium levels (0.2 mg/dL, P <.001) than nonhydrochlorothiazide participants, but only one participant in the hydrochlorothiazide group had hypercalcemia. In contrast, none of the nonhydrochlorothiazide participants had hypercalcemia. In a linear regression model adjusted for age, sex, 25-hydroxyvitamin D at 3 months, and other covariates, only hydrochlorothiazide use (Estimate [SE]: 0.05 [0.01], P = .01) predicted serum calcium at 3 months.ConclusionIn summary, vitamin D3 supplementation up to 4000 IU in hydrochlorothiazide users is associated with an increase in serum calcium but a low frequency of hypercalcemia. These findings suggest that participants of this population can use hydrochlorothiazide with up to 4000 IU of vitamin D3 daily and experience a low frequency of hypercalcemia.Copyright © 2014 Elsevier Inc. All rights reserved.

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