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Oral morphine drops for prompt relief of breathlessness in patients with advanced cancer—a randomized, double blinded, crossover trial of morphine sulfate oral drops vs. morphine hydrochloride drops with ethanol (red morphine drops)

  • Birgit AabomEmail author
  • Gunnar Laier
  • Poul Lunau Christensen
  • Tine Karlsson
  • May-Britt Jensen
  • Birte Hedal
Original Article
  • 27 Downloads

Abstract

Purpose

Episodic breathlessness is frequent in palliative cancer patients. Opioids are the only pharmacological agents with sufficient evidence in treatment. In Denmark, the main recommendation is red morphine drops (RMD), an off-label solution of morphine, ethanol, and red color (cochenille) described since 1893 (Pharmacopoea Danica). In 2015, the Danish Medicines Agency increased focus on off-label medicines and recommended registered morphine drops without ethanol instead. However, our palliative patients told us that RMD was better. For that reason, we conducted a clinical trial to clarify any perceived difference between the two types of drops.

Methods

We conducted a randomized, double blinded, crossover trial. Patients were asked to perform standardized activity (2-min walk) aiming to provoke breathlessness. Primary endpoint (breathlessness NRS) and secondary endpoints (saturation, pulse, respiratory frequency) were measured before (t = 0) and after test medicine at t = 1, t = 3, t = 5, t = 10, and t = 20 min. After 2–4 days (washout period), the patients repeated the test, receiving the alternative drops in a blinded setup (crossover).

Results

In the first 3 min, the relative drop in breathlessness for morphine drops with ethanol (RMD) was significant more than for morphine drops without ethanol. We found no significant difference in secondary endpoints.

Conclusions

A conclusion could be that ethanol might facilitate morphine absorption in the mouth. Our results needs further research of opioid absorption in the mouth as well as trials, testing morphine vs. more lipophilic opioids. The RMD drops are cheap, easy to use, and noninvasive and keep the patient independent of health care professionals.

Keywords

Breathlessness Advanced cancer Opioids, Randomized crossover trial Sublingual administration 

Notes

Funding information

Zealand University Hospital, Oncology Department and Hospice Zealand financially supported this study.

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed were in accordance with the ethical standards of Zealand University Hospital and Hospice Zealand and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The Regional Ethical Committee (SJ-502) approved the study.

Disclaimer

The funding body had no role in the study design, collection, analysis or interpretation of data, writing of report, or decision to submit for publication. The authors have no financial relationship with the funding source. The authors have full control of all primary data and agree to allow the journal to review data if requested.

Supplementary material

520_2019_5116_MOESM1_ESM.docx (28 kb)
ESM 1 (DOCX 28 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Clinical Oncology and Palliative CareZealand University HospitalRoskildeDenmark
  2. 2.Department of Data and InnovationRegion ZealandSoroeDenmark
  3. 3.Hospice ZealandRoskildeDenmark

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