title: Influence of 1-week Helicobacter pylori eradication therapy with rabeprazole, clarithromycin, and metronidazole on 13C-aminopyrine breath test.
abstract: Helicobacter pylori eradication therapy is commonly prescribed in the general population. Treatment consists of drugs that are mainly metabolized by the liver cytochrome P-450 (CYP) enzymatic pool. Most H. pylori-infected patients often take drugs for comorbid illnesses, therefore increasing the potential for drug-drug interactions. We aimed to evaluate the interactions of rabeprazole, clarithromycin, and metronidazole 1-week H. pylori eradication therapy with CYP-dependent liver metabolic function in clinical practice. Ten patients referred to our unit for H. pylori infection underwent 1-week eradication therapy with rabeprazole (20 mg, b.i.d.), clarithromycin (500 mg, b.i.d.), and metronidazole (500 mg, b.i.d.). We chose the 13C-aminopyrine breath test (13C-ABT) to evaluate CYP-dependent liver function since it is noninvasive and nonharmful. All patients underwent 13C-ABT at three time points: before therapy (to), at the end of therapy (t8), and after 1 month of follow-up (t38). Mean 13C-ABT dose/hr (t0 = 14.0 +/- 5.4, t8 = 13.5 +/- 4.0, t38 = 16.1 +/- 5.6) as well as 13C-ABT cumulative dose (t0 = 2.4 +/- 1.1, t8 = 2.4 +/- 0.8, t38 = 2.6 +/- 1.0) were not statistically different at the three time points of the study. These results did not seem to be influenced by drugs being administered concomitantly. In everyday clinical practice rabeprazole-based H. pylori eradication therapy does not seem to display any significant interactions with CYP-dependent liver function, even in patients on multiple drugs.
authors.affiliation: Gastroenterology Unit, Department of Internal Medicine, University of Genoa, Genoa, Italy.
authors.forename: Edoardo G
authors.initials: EG
authors.lastname: Giannini
authors.forename: Federica
authors.initials: F
authors.lastname: Malfatti
authors.forename: Federica
authors.initials: F
authors.lastname: Botta
authors.forename: Simone
authors.initials: S
authors.lastname: Polegato
authors.forename: Emanuela
authors.initials: E
authors.lastname: Testa
authors.forename: Alessandra
authors.initials: A
authors.lastname: Fumagalli
authors.forename: Mario
authors.initials: M
authors.lastname: Mamone
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Savarino
authors.forename: Roberto
authors.initials: R
authors.lastname: Testa
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000368:Aged; D000632:Aminopyrine; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000627:therapeutic use; D000890:Anti-Infective Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D001562:Benzimidazoles / Q000008:administration & dosage* / Q000627:therapeutic use; D001944:Breath Tests; D002247:Carbon Isotopes; D017291:Clarithromycin / Q000008:administration & dosage* / Q000627:therapeutic use; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D004347:Drug Interactions; D004359:Drug Therapy, Combination; D004791:Enzyme Inhibitors / Q000008:administration & dosage* / Q000627:therapeutic use; D005260:Female; D016481:Helicobacter Infections / Q000188:drug therapy* / Q000503:physiopathology; D016480:Helicobacter pylori; D006801:Humans; D008099:Liver / Q000201:enzymology; D008111:Liver Function Tests; D008297:Male; D008795:Metronidazole / Q000008:administration & dosage* / Q000627:therapeutic use; D008875:Middle Aged; D009853:Omeprazole / Q000008:administration & dosage* / Q000031:analogs & derivatives* / Q000627:therapeutic use; D064750:Rabeprazole
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D001562:Benzimidazoles; D002247:Carbon Isotopes; D004791:Enzyme Inhibitors; D000632:Aminopyrine; D008795:Metronidazole; D064750:Rabeprazole; D003577:Cytochrome P-450 Enzyme System; D017291:Clarithromycin; D009853:Omeprazole