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Testosterone Levels in People Taking Regular Low-Dose Sustained-Release Morphine for Persisting Breathlessness: An

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Regular low-dose sustained-release morphine did not significantly impact testosterone levels in patients with chronic breathlessness. Declines were uncommon and linked to worsening illness, not morphine dosage or breathlessness severity.

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Area of Science:

  • Pharmacology
  • Endocrinology
  • Pulmonology

Background:

  • Persistent breathlessness is a debilitating symptom in chronic obstructive pulmonary disease (COPD).
  • Sustained-release (SR) morphine is used for managing chronic breathlessness.
  • The long-term effects of SR morphine on testosterone levels are not well understood.

Purpose of the Study:

  • To investigate the intermediate- and long-term effects of regular low-dose sustained-release (SR) morphine on testosterone levels in individuals with persistent breathlessness.
  • To explore potential relationships between testosterone changes, morphine dosage, and breathlessness severity.

Main Methods:

  • Exploratory analysis of a randomized controlled trial involving SR morphine (0-24 mg/day) for persistent breathlessness in COPD.
  • Total testosterone levels were measured at baseline and after at least three months of stable medication.
  • Participant data included morphine dose, breathlessness status, and overall illness progression.

Main Results:

  • Among 20 participants (9 males), only 3 showed substantial testosterone declines.
  • These declines occurred in the 8, 16, and 24 mg SR morphine groups.
  • No clear relationship was found between testosterone change, morphine dose, or breathlessness change.

Conclusions:

  • Substantial declines in testosterone levels were uncommon in patients receiving SR morphine for breathlessness.
  • Testosterone changes were not directly related to morphine dose or breathlessness severity.
  • Worsening underlying illness may be a factor in testosterone decline during SR morphine treatment.