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  • Title: Losartan potassium/hydrochlorothiazide (Preminent®) and hyponatremia: case series of 40 patients.
    Author: Kinoshita H, Kobayashi K, Yaguramaki T, Yasuda M, Fujiki K, Tomiyama J, Koga N, Yakushiji F.
    Journal: Hum Exp Toxicol; 2011 Sep; 30(9):1409-14. PubMed ID: 20974655.
    Abstract:
    The clinical course of losartan potassium/hydrochlorothiazide (Preminent(®))-induced hyponatremia has not been described. We summarized 40 patients with Preminent-induced hyponatremia. The study involved 15 (37.5%) men and 25 (62.5%) women (mean age [SD], 76.4 [8.3] years; range, 55-95). Their sodium levels before Preminent administration were 139.5 (4.9) mEq/L (range, 131-145; reference range, 135-147). The duration from the day of Preminent administration to the day with the lowest sodium level was 59.3 (64.9) days (range, 2-207; median, 24). Most patients for whom this duration was <50 days exhibited progressive symptoms, whereas most of those for whom this duration was >50 days did not exhibit progressive symptoms but exhibited symptoms after fever or appetite loss. The lowest sodium value was 114.4 (8.2) mEq/L (range, 99-133). The duration from the time of Preminent discontinuation to (1) the time of early recovery and (2) the time of final recovery was 6.8 (5.5) days (range, 1-20; median, 5) and 11.6 (7.6) days (range, 2-29; median, 7.5), respectively. Of the 40 patients, 36 (90.0%) achieved full recovery, 1 (2.5%) suffered from after-effects due to central pontine myelinolysis, 1 (2.5%) died, and 2 (5.0%) were unknown. In the analysis of other adverse effects of Preminent and the same adverse effects of other three angiotensin II receptor blocker (ARB)/thiazide combinations, hyponatremia was observed as a primary adverse effect of all ARB/thiazide combinations. However, hyperesthesia dermatitis was reported as an adverse effect of Preminent only.
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