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A gastrointestinal simulation system for dissolution of oral solid dosage forms before and after Roux-en-Y gastric bypass
  1. Jan Peter Yska1,
  2. Ronald J Punter2,
  3. Herman J Woerdenbag3,
  4. Marloes Emous3,
  5. Henderik W Frijlink2,
  6. Bob Wilffert4,5,
  7. Eric N van Roon1,4
  1. 1 Department of Clinical Pharmacy and Clinical Pharmacology, Medical Centre Leeuwarden, Leeuwarden, The Netherlands
  2. 2 Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Groningen Research Institute of Pharmacy, Groningen, The Netherlands
  3. 3 Department of Surgery, Medical Centre Leeuwarden, Leeuwarden, The Netherlands
  4. 4 University of Groningen, Groningen Research Institute of Pharmacy, PharmacoTherapy, Epidemiology and Economics, Groningen, The Netherlands
  5. 5 Department of Clinical Pharmacy and Pharmacology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
  1. Correspondence to Dr Jan Peter Yska, Department of Clinical Pharmacy and Clinical Pharmacology, Medical Centre Leeuwarden, Leeuwarden 8901 BR, The Netherlands; j.p.yska{at}znb.nl

Abstract

Background The Roux-en-Y gastric bypass (RYGB) is a bariatric procedure, greatly reducing the stomach size and bypassing the duodenum and proximal jejunum. Hence, RYGB may reduce the absorption and bioavailability of oral medication. For clinical decisions on the use of medication, knowledge of altered modifications in drug disposition is a prerequisite. An in vitro dissolution method for solid oral medications, simulating conditions before and after RYGB, might be a valuable tool to predict the pharmaceutical availability of medicines frequently used by patients after RYGB.

Objectives To develop a gastrointestinal simulation system (GISS), mimicking conditions before and after RYGB for investigating dissolution characteristics of solid oral medications, and to assess the pharmaceutical availability of metoprolol from immediate-release (IR) and controlled-release (CR) tablets under these conditions.

Methods With an adjusted, pharmacopoeial paddle dissolution apparatus, the GISS enables variation in parameters which are relevant to drug release in vivo: pH, volume, residence time, osmolality and agitation. Metoprolol tartrate 100 mg IR tablets and metoprolol CR tablets were tested. Release profiles were determined by measuring the concentrations of metoprolol spectrophotometrically.

Results From IR tablets, under all conditions applied, >85% of metoprolol was released within 25 min. From all tested CR tablets >90% of metoprolol was released after 22 hours.

Conclusions This GISS is a suitable dissolution system to assess pharmaceutical availability before and after RYGB. In patients who have undergone RYGB, no problems in pharmaceutical availability of metoprolol IR and CR tablets are to be expected. Any changes in response to metoprolol in patients after RYGB should therefore be ascribed to changes in bioavailability.

  • gastrointestinal simulation system
  • Roux-en-Y gastric bypass
  • dissolution
  • metoprolol
  • controlled release
  • pharmaceutical availability

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