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Updated: Nov 23, 2025

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
Published on: July 29, 2014
Consideration of immunomodulatory actions of morphine in COVID-19 - Short report
B Hudzik1, J Nowak, B Zubelewicz-Szkodzinska
1Department of Cardiovascular Disease Prevention, Department of Metabolic Disease Prevention, Faculty of Health Sciences in Bytom, Medical University of Silesia in Katowice, Poland. justyna.nowak@sum.edu.pl.
Abstract:
Cytokine storm in COVID-19 is linked to disease severity and mortality. 40% of patients with severe COVID-19 require mechanical ventilation. Analgesia and sedation are used for treatment of pain, facilitation of mechanical ventilation, or management of acute agitation. Herein, we present the immunomodulating actions of morphine that may either improve or worsen the clinical course of COVID-19 once cytokine storm develops. A literature search was performed to find articles on potential immunomodulatory effects of morphine. Taken together, the results of in vitro and in vivo models in non-COVID-19 conditions suggest that morphine could have a beneficial effect by mitigating the cytokine storm in the early stages of severe COVID-19. In contrast, it could be potentially harmful in late stages of severe COVID-19, especially in the presence of septic shock.
Insights
Morphine’s effects on severe COVID-19 patients depend on the disease stage. Early cytokine storm mitigation may be beneficial, but late-stage use, particularly with septic shock, could be harmful.
Area of Science:
- Immunology and Pharmacology
- Critical Care Medicine
Background:
- Cytokine storm correlates with severe COVID-19, mortality, and mechanical ventilation needs.
- Analgesia and sedation are crucial for managing pain, ventilation, and agitation in severe cases.
Purpose of the Study:
- To investigate the immunomodulatory effects of morphine in COVID-19.
- To determine if morphine could improve or worsen COVID-19 outcomes during cytokine storm.
Main Methods:
- Literature search for studies on morphine's immunomodulatory effects.
- Analysis of in vitro and in vivo models (non-COVID-19 conditions).
Main Results:
- Morphine may mitigate cytokine storm in early stages of severe COVID-19.
- Morphine could be detrimental in late stages, especially with septic shock.
Conclusions:
- Morphine's role in COVID-19 is complex, with potential dual effects based on disease progression.
- Further research is needed to clarify morphine's impact on COVID-19 cytokine storm.
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