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Delivery of testosterone replacement therapy.

Asjad Hameed1, Theresa Brothwood, Pierre Bouloux

  • 1Centre for Neuroendocrinology, Royal Free and University College Medical School, Royal Free Campus, Hampstead, London, NW3 2QG, UK.

Current Opinion in Investigational Drugs (London, England : 2000)
|December 3, 2003
PubMed
Summary

Testosterone replacement therapy faces challenges due to poor oral absorption. Various delivery methods and structural modifications are explored to improve testosterone

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Area of Science:

  • Endocrinology
  • Pharmacology

Background:

  • Androgen deficiency affects approximately 5 in 1000 men.
  • Oral testosterone delivery is limited by rapid metabolism and short half-life.
  • Testosterone derivatives aim to enhance potency, duration, or bioavailability.

Purpose of the Study:

  • To review current and emerging testosterone replacement therapy (TRT) options.
  • To discuss structural modifications of testosterone for improved therapeutic outcomes.
  • To evaluate various delivery systems for TRT.

Main Methods:

  • Review of existing literature on testosterone formulations and delivery systems.
  • Analysis of structural modifications of testosterone and their effects.
  • Comparison of available TRT methods including oral, transcutaneous, intramuscular, and novel systems.

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Main Results:

  • Multiple TRT formulations exist: oral, transcutaneous, sublingual, intramuscular, pellets, and transbuccal.
  • Biodegradable microspheres offer 2-3 month testosterone delivery.
  • 7 alpha-Methyl 19-nortestosterone shows potential for tissue-specific action without hepatotoxicity.

Conclusions:

  • Optimal testosterone replacement therapy requires careful consideration of delivery methods and drug modifications.
  • Novel delivery systems like microspheres and specific synthetic androgens offer improved therapeutic potential.
  • Further research into tissue-specific androgens may mitigate side effects of TRT.