Hypomagnesemia Induced by Long-Term Treatment with Proton-Pump Inhibitors

Janett, Simone; Camozzi, Pietro; Peeters, Gabriëlla G. A. M.; Lava, Sebastiano A. G.; Simonetti, Giacomo D.; Goeggel Simonetti, Barbara; Bianchetti, Mario G.; Milani, Gregorio P.

doi:https://doi.org/10.1155/2015/951768

Gastroenterology Research and Practice

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Volume 2015 | Article ID 951768 | https://doi.org/10.1155/2015/951768

Hypomagnesemia Induced by Long-Term Treatment with Proton-Pump Inhibitors

Simone Janett,¹Pietro Camozzi,¹Gabriëlla G. A. M. Peeters,¹Sebastiano A. G. Lava,²Giacomo D. Simonetti,^1,2Barbara Goeggel Simonetti,^1,3Mario G. Bianchetti,¹and Gregorio P. Milani⁴

Academic Editor: Haruhiko Sugimura

Received22 Dec 2014

Accepted16 Apr 2015

Published04 May 2015

Abstract

In 2006, hypomagnesemia was first described as a complication of proton-pump inhibitors. To address this issue, we systematically reviewed the literature. Hypomagnesemia, mostly associated with hypocalcemic hypoparathyroidism and hypokalemia, was reported in 64 individuals on long-term proton-pump inhibitors. Hypomagnesemia recurred following replacement of one proton-pump inhibitor with another but not with a histamine type-2 receptor antagonist. The association between proton-pump inhibitors and magnesium metabolism was addressed in 14 case-control, cross-sectional studies. An association was found in 11 of them: 6 reports found that the use of proton-pump inhibitors is associated per se with a tendency towards hypomagnesemia, 2 found that this tendency is more pronounced in patients concurrently treated with diuretics, carboplatin, or cisplatin, and 2 found a relevant tendency to hypomagnesemia in patients with poor renal function. Finally, findings likely reflecting decreased intestinal magnesium uptake were observed on treatment with proton-pump inhibitors. Three studies did not disclose any relationship between magnesium metabolism and treatment with histamine type-2 receptor antagonists. In conclusion, proton-pump inhibitors may cause hypomagnesemia. In these cases, switching to a histamine type-2 receptor antagonist is advised.

1. Introduction

First introduced in the late 1980s, proton-pump inhibitors are widely used for the management of conditions related to gastric acid secretion such as duodenal and gastric ulcer, reflux esophagitis, and gastroesophageal reflux disease [1].

The cases of two patients developing severe hypomagnesemia along with hypocalcemia and hypokalemia while being on long-term treatment with a proton-pump inhibitor and resolution after withdrawal were first described in 2006 [2]. Following the initial recognition, the association has been subsequently confirmed in various reports [3]. We systematically reviewed and analyzed the available literature. Our aims were to describe in detail this electrolyte abnormality, to address the underlying mechanisms, and to warn physicians about its occurrence.

2. Methods

Between May and October 2014, two of the authors (Simone Janett, Pietro Camozzi) independently conducted a computer-based research of the terms “proton-pump inhibitor[s],” “dexlansoprazole,” “omeprazole,” “esomeprazole,” “lansoprazole,” “pantoprazole,” “rabeprazole,” and “hypomagnes[a]emia” or “magnesium” in the U.S. National Library of Medicine database and in the Web-based Google search engine. For this purpose, we used the principles established by the UK Economic and Social Research Council guidance on the conduct of narrative synthesis and on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. Reports available as an article or as a letter in Dutch, English, French, German, Italian, Portuguese, or Spanish were retained for the analysis. To ensure that the search included all published cases, cross-citation screening was manually performed in the references of the included articles. Poorly documented case reports and cases with electrolyte abnormalities secondary to proton-pump inhibitor associated kidney injury were not included [4].

From each individually described patient with hypomagnesemia (<0.75 mmol/L) on proton-pump inhibitor treatment, we made attempts to obtain the following data: gender; age; details and duration of medication; concurrent conditions or management with drugs inducing hypomagnesemia; and laboratory findings regarding magnesium (including changes after withdrawal and rechallenge with a different proton-pump inhibitor or with a histamine type-2 receptor antagonist), calcium, parathyroid hormone and potassium blood levels, and urine magnesium excretion. From case-control, cross-sectional studies, we collected the following information: study setting; year of publication; origin of the report; number of patients and details; magnesium level; comorbidities and concurrent medications. Finally, we reviewed the United States Food and Drug Administration data on hypomagnesemia as adverse event reported during the use of proton-pump inhibitors.

Numerical data are presented as median and interquartile range and categorical data as relative frequency. Linear regressions with the rank correlation coefficient were performed for analysis. Significance was assumed when .

3. Results

3.1. Search Results

The initial search revealed 534 publications, of which 260 remained after excluding duplicates (Figure 1). Ninety were reviewed in detail and 56 retained for the final analysis. Four pertinent reports were found in the references of the mentioned reports. Hence, in the final analysis [2, 5–63], we included a total of 60 reports (48 in English, 6 in Spanish, 3 in French, 1 in Dutch, 1 in German, and 1 in Italian) from the United Kingdom (), the United States of America (), Spain (), the Netherlands (), Brazil (), France (), Italy (), Switzerland (), Australia (), Belgium (), Canada (), Germany (), Korea (), Argentina (), Greece (), Israel (), Japan (), New Zealand (), and Turkey ().

They were 45 reports detailing individual cases [2, 19–62], 14 case-control, cross-sectional studies [5–18] and one report based on the United States Food and Drug Administration data [63]. The case of a Spanish patient reported twice in the literature was considered only once [33, 34].

3.2. Individual Cases

The 45 reports detailing cases of proton-pump inhibitor associated hypomagnesemia included a total of 64 individual cases. The characteristics of the patients (30 male and 34 female subjects) appear in Table 1. The age of 53 (83%) of the 64 patients ranged between 50 and 80 years. Hypomagnesemia was rather severe: it ranged between 0.03 and 0.71, with median 0.21 mmol/L and was ≤0.50 mmol/L in 62 (97%) cases. The duration of treatment with a proton-pump inhibitor was one year or more in all cases with the exception of a newborn baby with gastroesophageal reflux on lansoprazole, and 3 years or more in 75% of the cases. When measured, hypomagnesemia was always accompanied by hypomagnesiuria. Moreover, it was very often accompanied by blood calcium level <2.20 mmol/L (97%), low or normal parathyroid hormone levels (95%), and blood potassium level <3.50 mmol/L (87%). Linear regression analysis did not show an association between the degree of hypomagnesemia with the degree of hypocalcemia or hypokalemia (Figure 2). Further possible causes of hypomagnesemia were observed in at least 21 cases: treatment with either thiazide () or loop diuretic (), alcohol abuse (), poor renal function (), and small bowel resection ().

(a)

(b)

The following proton-pump inhibitors were used in the 64 patients: omeprazole, esomeprazole, the S-isomer of omeprazole, or both (); pantoprazole (); lansoprazole (); omeprazole and lansoprazole (); rabeprazole (). No cases of hypomagnesemia were reported on dexlansoprazole. Hypomagnesemia resolved after discontinuing the proton-pump inhibitor but recurred following replacement with another proton-pump inhibitor in at least 13 cases. In these cases, the initially used proton-pump inhibitor was replaced as follows: with omeprazole or esomeprazole (); with lansoprazole (); with pantoprazole (); with esomeprazole and subsequently pantoprazole (); and with pantoprazole and subsequently lansoprazole (). In contrast, hypomagnesemia did not recur in 32 patients following switching to a histamine type-2 receptor antagonist: ranitidine (), famotidine (), and cimetidine ().

3.3. Case-Control, Cross-Sectional Studies

The association between proton-pump inhibitors and metabolism of magnesium was addressed in 14 case-control, cross-sectional studies, as given in Table 2. An association was found uniquely in 10 of them. Six reports found that the use of proton-pump inhibitors is associated per se with a tendency towards hypomagnesemia [8, 10, 11, 13, 14, 18]. Two reports found that the tendency towards hypomagnesemia is more pronounced in patients concurrently treated with either diuretic [13, 18] or carboplatin and cisplatin [11]. Danziger et al. [7] found that hypomagnesemia occurs exclusively in patients concurrently taking diuretics. Furthermore, two reports found a relevant tendency to hypomagnesemia in patients with poor renal function treated with proton-pump inhibitors [5, 15].

William et al. [17] found an association between the use of proton-pump inhibitors and decreased urinary magnesium excretion (a finding that likely reflects a decreased intestinal magnesium uptake).

Finally, three of the aforementioned studies did not find any relationship between magnesium and histamine type-2 receptor antagonists [7, 14, 18].

3.4. United States Food and Drug Administration Data

The reports submitted to the Adverse Event Reporting System of the United States Food and Drug Administration were recently examined to address the association between use of proton-pump inhibitors and hypomagnesemia [63]. Between 1997 and 2012, 66,102 subjects were identified as experiencing at least one adverse effect while taking a proton-pump inhibitor. Among the mentioned subjects, 693 (=1.0%) were reported to have hypomagnesemia. Subjects aged ≥65 years were at increased risk of hypomagnesemia (). Finally, there was a strong () association between occurrence of hypomagnesemia and that of hypocalcemia or hypokalemia. Two thirds () of the hypomagnesemia cases occurred in subjects treated with omeprazole or esomeprazole, the most frequently prescribed proton-pump inhibitors.

4. Discussion

This work brings together the most recent literature and some reports identified exclusively from the search engine Google Scholar. Its results, acquired both in individual case reports and in case-control, cross-sectional studies, support the hypothesis that management with proton-pump inhibitors may cause hypomagnesemia along with hypomagnesiuria, hypocalcemia, and hypokalemia (see the following list). This tendency is more pronounced in patients concomitantly treated with cisplatin, carboplatin, and especially diuretics and in those with poor renal function.

Clinical and Biochemical Characteristics of Proton-Pump Inhibitor Associated Hypomagnesemia. Consider the following.(i)Age mostly ≥50 years, duration of treatment ≥1 year, and no emblematical patient profile unique for this electrolyte abnormality, being more frequent in patients concurrently managed with other factors that may lower magnesemia (e.g., management with thiazides and loop diuretics, alcohol abuse) and in those with poor renal function.(ii)Hypomagnesemia often accompanied by hypocalcemic hypoparathyroidism and hypokalemia.(iii)Hypomagnesemia resolution soon after discontinuing the proton-pump inhibitor, recurring upon readministration or after replacement of one proton-pump inhibitor with another (=class effect).(iv)Hypomagnesemia not occurring with histamine type-2 receptor antagonists (e.g., ranitidine).

The concurrent demonstration of both magnesium deficiency and hypomagnesiuria suggests that impaired intestinal magnesium absorption is the culprit. This electrolyte abnormality recovers within 4 days after discontinuing the drug; it recurs upon readministration or after replacement with another proton-pump inhibitor [64], but it does not develop with other acid suppressants such as histamine type-2 receptor antagonists. Hypomagnesemia was mostly accompanied by hypocalcemia and normal or low parathyroid hormone levels, confirming the existence of a state of secondary hypoparathyroidism in the most severely hypomagnesemic patients [65]. A further common laboratory finding was hypokalemia, a recognized consequence of hypomagnesemia [65].

In the few individual cases available for such an analysis, no significant correlation was noted between circulating magnesium and hypocalcemia or hypokalemia. At least two factors might account for this unexpected observation. First, there are sometimes differences among laboratories with respect to total magnesium determination in blood [65]. Furthermore, circulating magnesium exists in the ionized, biologically active state and in the undissociated form, either bound to albumin or complexed to anions such as bicarbonate, citrate, and phosphate [65].

At least three limitations of our study should be mentioned. First, the analysis results rather from the small number of reported subjects affected by proton-pump inhibitor associated hypomagnesemia. Second, because of the scant information available on the clinical presentation of magnesium deficiency, the present study does not address this issue. Third, the underlying mechanisms require further investigations.

Recognition and management of hypomagnesemia secondary to long-term treatment with proton-pump inhibitors mainly rest on two pillars: first, blood magnesium monitoring at least in patients with symptoms or signs consistent with magnesium deficiency, in those concurrently treated with other agents that may lower magnesium level, and in those with poor renal function; second, in patients with hypomagnesemia, switching to a histamine type-2 receptor antagonist may be attempted. Further studies are required to identify whether magnesium supplements or sucralfate might be prescribed in subjects with proton-pump inhibitor associated hypomagnesemia.

Disclosure

The authors have no financial relationships relevant to this paper to disclose.

Conflict of Interests

The authors declare that there is no potential conflict of interests.

Authors’ Contribution

Simone Janett, the principal investigator, conceptualized and designed the study, performed the review of the literature, drafted the initial paper, and approved the final paper as submitted. Pietro Camozzi conceptualized and designed the study, performed the review of the literature, designed the figures, and approved the final paper as submitted. Gabriëlla G. A. M. Peeters conceptualized the study, substantially participated in the review of the literature, and approved the final paper as submitted. Sebastiano A. G. Lava contributed to the study design, supervised the review of the literature, prepared the figures, and wrote the final paper as submitted. Giacomo D. Simonetti and Barbara Goeggel Simonetti supervised the review of the literature and approved the final paper as submitted. Mario G. Bianchetti, the senior author, conceptualized and designed the study, supervised the review of the literature and the preparation of the paper, performed statistical analysis, and wrote the final paper as submitted. Gregorio P. Milani conceptualized and designed the study, supervised the review of the literature, the statistical analysis, and wrote the final paper as submitted. Simone Janett and Pietro Camozzi contributed equally to this work.

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Copyright © 2015 Simone Janett et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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