Isotopically Labeled Drugs

Isotopically Labeled Drugs

Published on 25/01/2022

Stable isotopically labeled drugs are routinely used to investigate a drug’s metabolism, distribution, bioavailability, side effects and potential toxicity. Discover our selection of labeled drugs.

For the development of innovative therapies and new drug agents, detailed information to understand a drug’s metabolic and pharmacokinetic pathway, its distribution and potential accumulation and toxicities are of crucial importance. The so-called ADMET profile, the absorption, distribution, metabolism, excretion, and toxicology of a drug, is one major checkpoint during drug discovery.

During such analysis not only the drug and drug-derived agents are monitored, but also various endogenous metabolites, which change rapidly in response to physiological perturbations such as drug consumption, as they serve as reporters to monitor the response to drug treatment.

In this regard, quantitative metabolomics is a frequently utilized tool for the identification of such biomarkers among other metabolites. In the past, radioisotopes have been utilized for tracking due to their sensitive detectability. However, nowadays, the use of stable isotopes has increased due to greater availability and safety. Some of the most common stable isotopes are 2H, 13C, and 15N with natural abundances of 0.015%, 1.10%, and 0.366%. Thereby, quantification of metabolite levels via mass spectrometry is frequently employed.

Typically, the heavy labeled standards are used as internal standards for quantitative metabolite profiling, allowing accurate measurements and diagnosis. In differential proteomics, two samples are compared, one labeled with the naturally occurring isotope abundance (light) and the other with a stable isotope of low natural abundance (heavy). The samples are mixed, and their ratio is analyzed by mass spectrometry to determine the relative amounts of a given substance in two samples. Such results are unaffected by errors during sample preparation and instrument response.

Iris Biotech is presenting a selection of stable isotopically labeled (SIL) derivatives to be used as reference standard for analysis.

➔ Interested? Scroll down to the section “related products” to see all available drug derivatives.


Isotopic labeling of metabolites in drug discovery applications; J. Iglesias, L. Sleno, D. A. Volmer; Curr. Drug Metab. 2012; 13(9): 1213-1225.

The use of stable isotope labelling for the analytical chemistry of drugs; C. J. Unkefer, R. A. Martinez; Drug Test Anal. 2012; 4(3-4): 303-7.

Chapter 25 The Use of Isotopically Labeled Compounds in Drug Discovery; C. S. Elmore; Annual Reports in Medicinal Chemistry 2009; 44: 515-534.

Stable isotope labeling – Liquid chromatography/mass spectrometry for quantitative analysis of androgenic and progestagenic steroids; N. Guo, P. Liu, J. Ding, S.-J. Zheng, B.-F. Yuan, Y.-Q. Feng; Anal. Chim. Acta 2016; 905: 106-114.

Stable isotope labelling methods in mass spectrometry-based quantitative proteomics; O. Chahrour, D. Cobice, J. Malone; J. Pharm. Biomed Anal. 2015; 113(2): 2-20.

Stable isotopic labeling of proteins for quantitative proteomic applications; G. W. Becker; Briefings in Functional Genomics 2008; 7(5): 371-382.

Related Products
    1. Micafungin-D11 Sodium Salt
      Micafungin-D11 Sodium Salt

      Product code: LS-4500

      Starting at Please inquire

    2. Structure image for Anidulafungin-D11

      Product code: LS-4510

      Starting at Please inquire

    3. Structure image for Moclobemide d8
      Moclobemide d8

      Product code: LS-4520

      Starting at Please inquire

    4. Structure image for Felbamat-d4

      Product code: LS-4530

      Starting at Please inquire

    5. Structure image for Lacosamide-d3

      Product code: LS-4540

      Starting at Please inquire

    6. Structure image for Ethosuximide-13C, D3
      Ethosuximide-13C, D3

      Product code: LS-4550

      Starting at Please inquire

    7. Structure image for Zonisamid-15N d4
      Zonisamid-15N d4

      Product code: LS-4560

      Starting at Please inquire

    8. Structure image for N-Desmetylmesuximid d5
      N-Desmetylmesuximid d5

      Product code: LS-4570

      Starting at Please inquire

    9. Structure image for Sultiame d4
      Sultiame d4

      Product code: LS-4580

      Starting at Please inquire

    10. Structure image for 2-Ethyl-2-phenylmalonamide d5
      2-Ethyl-2-phenylmalonamide d5

      Product code: LS-4590

      Starting at Please inquire

    11. Structure image for Stiripentol d9
      Stiripentol d9

      Product code: LS-4600

      Starting at Please inquire

    12. Structure image for Perampanel d5
      Perampanel d5

      Product code: LS-4610

      Starting at Please inquire

    13. Structure image for Topiramat d12
      Topiramat d12

      Product code: LS-4620

      Starting at Please inquire

    14. Structure image for Mycophenolic acid-glucuronide-d3
      Mycophenolic acid-glucuronide-d3

      Product code: LS-4630

      Starting at Please inquire

    15. Structure image for Mycophenolic acid-d3
      Mycophenolic acid-d3

      Product code: LS-4640

      Starting at Please inquire