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Monitoring testosterone replacement therapy (TRT) with transdermal gels requires assessing levels at peak and trough times. This helps maintain optimal testosterone levels throughout the day for hypogonadal men.

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Area of Science:

  • Endocrinology
  • Pharmacology

Background:

  • Testosterone replacement therapy (TRT) is a standard treatment for male hypogonadism.
  • Transdermal testosterone gels are widely used, but optimal monitoring strategies are lacking.

Purpose of the Study:

  • To evaluate the effectiveness of transdermal testosterone gel in maintaining physiologic serum testosterone levels.
  • To determine optimal timing for monitoring testosterone levels during TRT.

Main Methods:

  • Thirty hypogonadal patients received 40 mg/day of 2% transdermal testosterone gel.
  • Serum total, bioavailable, and free testosterone were measured at 2 hours (peak) and 23 hours (trough) post-application.

Main Results:

  • Testosterone levels were significantly lower at 23 hours compared to 2 hours.
  • 70% of patients achieved adequate testosterone levels at 2 hours, but only 36.7% maintained them at 23 hours.
  • No significant differences were observed between replicate samples taken at the same time points.

Conclusions:

  • Assessing testosterone levels at both peak and trough is crucial for effective TRT with transdermal gels.
  • This dual assessment allows for personalized dosing to prevent supra-physiological levels and ensure adequate concentrations throughout the day.