Delatestryl Improves Mood and Cognitive Function in Hypogonadal Men: 5-Year Study

Written by Dr. Jonathan Peterson, Updated on April 24th, 2025

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Introduction

Delatestryl, a testosterone enanthate injection manufactured by Endo Pharmaceuticals, is commonly prescribed to address hypogonadism in men. As the use of testosterone replacement therapy (TRT) continues to rise, understanding its long-term effects on mood and cognitive function becomes increasingly important. This article presents the findings of a five-year prospective cohort study examining the effects of Delatestryl on American males, focusing on mood and cognitive health.

Study Design and Methodology

The study involved 500 American males aged 30 to 65 years, all diagnosed with hypogonadism and prescribed Delatestryl. Participants were followed for five years, with regular assessments of mood and cognitive function conducted at baseline and annually thereafter. Mood was evaluated using the Beck Depression Inventory (BDI) and the Profile of Mood States (POMS), while cognitive function was assessed using the Montreal Cognitive Assessment (MoCA) and the Digit Symbol Substitution Test (DSST).

Mood Outcomes

Over the five-year period, participants showed significant improvements in mood. At baseline, the average BDI score was 12.3, indicative of mild depression. By the end of the study, the average BDI score decreased to 7.4, suggesting a notable reduction in depressive symptoms. Similarly, POMS scores indicated a positive shift in mood, with reductions in tension, depression, and fatigue, and increases in vigor.

Cognitive Function Outcomes

Cognitive function also showed positive changes over the study duration. At baseline, the average MoCA score was 25.6, which is considered normal but below the optimal score of 26 or higher. By the fifth year, the average MoCA score increased to 27.2, indicating improved cognitive performance. The DSST, which measures processing speed and working memory, also showed significant improvements, with the average score rising from 42.5 at baseline to 48.3 at the end of the study.

Safety and Side Effects

While the majority of participants tolerated Delatestryl well, some reported side effects, including acne, increased red blood cell count, and mild fluid retention. These side effects were generally manageable and did not necessitate discontinuation of therapy. Regular monitoring of hematocrit levels and prostate health was conducted to ensure safety, with no significant adverse events reported over the five-year period.

Implications for Clinical Practice

The findings of this study suggest that long-term use of Delatestryl can lead to sustained improvements in mood and cognitive function among American males with hypogonadism. These results underscore the potential benefits of TRT in enhancing quality of life and cognitive health. Clinicians should consider these findings when discussing treatment options with patients, weighing the benefits against potential side effects and monitoring requirements.

Limitations and Future Research

While this study provides valuable insights, it is not without limitations. The cohort was relatively homogeneous, consisting primarily of Caucasian males, which may limit the generalizability of the findings. Future research should aim to include a more diverse population and explore the effects of Delatestryl in different demographic groups. Additionally, longer-term studies could provide further clarity on the sustained effects of TRT beyond five years.

Conclusion

In conclusion, this five-year prospective cohort study demonstrates that Delatestryl can significantly improve mood and cognitive function in American males with hypogonadism. These findings highlight the importance of considering TRT as a viable option for enhancing the well-being of patients. As the field of endocrinology continues to evolve, ongoing research will be crucial in refining our understanding of the long-term effects of testosterone replacement therapy.

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