Overview

Effects of LRYGB on Pharmacokinetics of Nine CYP Probe Drugs

Status:
Completed

Trial end date:
2014-12-10

Target enrollment:
0

Participant gender:
All

Summary

Due to anatomical and physiological changes caused by the Roux-en-Y gastric bypass (RYGB) bariatric surgery, drug bioavailability after the surgery can be altered. Therefore, post-operative dose adjustment in these patients can be required. The aim of the study was to investigate the effects of laparoscopic Roux-en-Y gastric bypass (LRYGB) surgery on drug pharmacokinetics and cytochrome P450 (CYP) mediated metabolism using a cocktail of nine CYP probe drugs. The cocktail covers nine main CYP enzymes: melatonin (CYP1A2), nicotine (CYP2A6), bupropion (CYP2B6), repaglinide (CYP2C8), losartan (CYP2C9), omeprazole (CYP2C19/CYP3A4), dextromethorphan (CYP2D6), chlorzoxazone (CYP2E1), midazolam (CYP3A4). The changes in pharmacokinetic parameters of the drugs as well as modulation of the activity of CYPs are evaluated before and one year after LRYGB. In the study, the patients administering drug cocktail before surgery and 1 year after LRYGB are served as their own controls.

Phase:

N/A

Accepts Healthy Volunteers?

Details

Lead Sponsor:

University of Eastern Finland

Collaborators:

Academy of Finland
Diabetes Research Foundation, Finland
Finnish Cultural Foundation
Kuopio University Hospital

Criteria

Inclusion Criteria:

- BMI > 40 kg/m2 or BMI 35-40 kg/m2 and a comorbidity or its risk factor, such as type 2
diabetes, hypertension, sleep apnea, osteoarthritis of weight bearing joints or
polycystic ovarian syndrome;

- previous conservative treatment for obesity had been proven to be ineffective;

- patients were assigned to undergo LRYGB surgery

- patients are able to give a written inform consent.

Exclusion Criteria:

- smokers

- consuming alcohol more than 20 g per day were included in the study

- taking drugs which alter CYPs activity

- history of hypersensitivity to the drugs used in the cocktail