alexa Abstract | Fluconazole-Associated Hypercalcemia in Patients with Coccidioidomycosis
ISSN: 2165-7920

Journal of Clinical Case Reports
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Abstract

Fluconazole, voriconazole, and itraconazole may potentiate the hypercalcemic effect of other medications, although to date, triazoles alone have not been linked to hypercalcemia. We describe a case of new-onset hypercalcemia in the setting of high-dose fluconazole that resolved after changing the antifungal regimen. We reviewed our institutional database to assess the frequency of moderate or severe hypercalcemia (serum calcium ≥12 mg/dL) among patients with coccidioidomycosis treated with a triazole. We identified 2,133 patients, seen from January 1, 2005, through December 20, 2012, with a diagnosis of coccidioidomycosis. Twenty-three patients (1%) had subsequent hypercalcemia; of these, 20 patients (87%) had moderate or severe hypercalcemia. Nine of the 20 patients (45%) with moderate or severe hypercalcemia were taking triazoles, and most had comorbid conditions that were risk factors for hypercalcemia (tertiary hyperparathyroidism, n=4; multiple myeloma, n=2; adrenal insufficiency, n=1). The effect of fluconazole on calcium metabolism possibly is small or not clinically significant until the dose is high. Fluconazole may also contribute to hypercalcemia in patients with underlying hyperparathyroidism because of the loss of calcium’s inhibitory effect on parathyroid hormone secretion. In summary, moderate or severe hypercalcemia is uncommon in coccidioidomycosis and rare in those treated with triazoles. High-dose fluconazole may be associated with symptomatic hypercalcemia, especially in patients with predisposing comorbid conditions.

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Author(s): Nam H Chan, Janis E Blair, Sydney A Westphal, Leila K Tehrani and Maria Teresa A Seville

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