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Drug Saf. 2019 Aug;42(8):993-1003. doi: 10.1007/s40264-019-00821-6.

Bismuth Concentrations in Patients Treated in Real-Life Practice with a Bismuth Subcitrate-Metronidazole-Tetracycline Preparation: The SAPHARY Study.

Author information

1
Bordeaux PharmacoEpi, University of Bordeaux, Bâtiment Le Tondu, Case 41, 146, rue Léo Saignat, 33076, Bordeaux Cedex, France.
2
INSERM CIC1401, CHU Bordeaux, Bordeaux, France.
3
Laboratory of Pharmacology and Toxicology, CHU Angers, Angers, France.
4
Department of Gastroenterology, Hepatology and Digestive Oncology, CHU Bordeaux, University of Bordeaux, Bordeaux, France.
5
Laboratory of Bacteriology, CHU Bordeaux, French National Reference Center for Helicobacters, Bordeaux, France.
6
INSERM U1053, University of Bordeaux, Bordeaux, France.
7
Department of Neurology, CHU Bordeaux, University of Bordeaux, Bordeaux, France.
8
INSERM U1219, University of Bordeaux, Bordeaux, France.
9
Bordeaux PharmacoEpi, University of Bordeaux, Bâtiment Le Tondu, Case 41, 146, rue Léo Saignat, 33076, Bordeaux Cedex, France. patrick.blin@u-bordeaux.fr.
10
INSERM CIC1401, CHU Bordeaux, Bordeaux, France. patrick.blin@u-bordeaux.fr.

Abstract

INTRODUCTION:

A fixed-dose association of bismuth subcitrate, metronidazole and tetracycline (BMT) (Pylera®, Allergan, NJ, USA) was made available in France in 2013 for the eradication of Helicobacter pylori. Due to a historical issue of bismuth encephalopathy, the French Health Authorities requested a study of blood and plasma bismuth concentrations with BMT in daily practice.

AIMS:

The aim of the study was to measure eventual bismuth accumulation and neurological toxicity in patients prescribed BMT.

METHODS:

Patients initiating BMT for H. pylori between March 2014 and December 2015 were included. A blood sample was taken before first BMT intake and 24 h after the last intake, for assay of bismuth. A concentration > 50 μg/L was considered abnormal. Neurological complaints were assessed at inclusion, at the end of the 10-day treatment course, and 28 days later.

RESULTS:

202 patients were included, of whom 190 took at least one dose of BMT, and 167 provided both required blood samples. Mean blood bismuth concentrations after the BMT course were 16.9 μg/L (95% confidence interval 15.6-18.3). Concentrations were > 50 μg/L (56.0 μg/L and 50.9 μg/L) in two elderly patients, one of whom presented mild, transient memory impairment during treatment. Non-serious neurological symptoms occurred in 20% of all patients and treatment failure was documented in 5% of patients.

CONCLUSIONS:

In this study measuring blood bismuth concentrations in real-life practice, in < 1% of patients the BMT course resulted in blood bismuth concentrations > 50 μg/L. No serious neurological adverse events were observed.

STUDY REGISTRATION:

EU-PAS register EUPAS3142 at www.encepp.eu ; ENCePP study seal.

PMID:
31069703
DOI:
10.1007/s40264-019-00821-6

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