Posaconazole-Induced Pseudohyperaldosteronism

A woman in her late 60s with disseminated histoplasmosis was treated with posaconazole because first-line therapies were not tolerated. She subsequently presented with decompensated heart failure, hypertension, and hypokalemia. Laboratory tests revealed low renin and aldosterone levels. A potential mechanism is inhibition of the enzyme 11β-hydroxysteroid dehydrogenase 2, with resultant apparent mineralocorticoid excess.