The use of isotopes in the determination of absolute bioavailability of drugs in humans

Lappin, Graham, Rowland, Malcolm and Garner, R. Colin (2006) The use of isotopes in the determination of absolute bioavailability of drugs in humans. Expert Opinion on Drug Metabolism and Toxicology, 2 (3). pp. 419-427. ISSN 1742-5255

Full content URL: http://dx.doi.org/10.1517/17425255.2.3.419

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Item Type:Article
Item Status:Live Archive

Abstract

Absolute bioavailability studies in humans are not routinely performed as part of the drug registration process. They tend to be reasonably demanding, not least because toxicology data are required to support intravenous administration of a drug. Moreover, the classical crossover design of an absolute bioavailability study can suffer from artefacts caused by concentration-dependent pharmacokinetics. Many of the problems associated with absolute bioavailability studies can be alleviated using isotopically labelled drugs. Stable isotopes have been used in the performance of absolute bioavailability studies in humans for > 30 years. More recently, the advantages of using radiolabelled drugs have been expanded by using the ultrasensitive technology of accelerator mass spectrometry. Isotopic labelling not only allows for the accurate and efficient determination of absolute bioavailability, but can also provide information on first-pass effects and other pharmacokinetic parameters. © 2006 Informa UK Ltd.

Keywords:radioisotope, drug absorption, drug bioavailability, drug determination, human, isotope labeling, mass spectrometry, review, Administration, Intravesical, Administration, Oral, Aminolevulinic Acid, Biological Availability, Clinical Trials, Cross-Over Studies, Humans, Injections, Intravenous, Midazolam, Radiopharmaceuticals
Divisions:College of Science > School of Pharmacy
ID Code:8228
Deposited On:24 Mar 2013 16:12

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