Vascular endothelial dysfunction (ED) plays a critical role in the pathogenesis of severe COVID-19. Intranasal dexamethasone (IN-DXM) has been reported to improve clinical outcomes more efficiently than intravenous (IV-DXM) administration in hospitalized patients. This study compared the efficacy of both regimens in improving ED.
Methods
Hospitalized COVID-19 patients from the REVIVAL trial received either intranasal dexamethasone (IN-DXM) via a MAD-Nasal device (0.12 mg/kg for 3 days followed by 0.06 mg/kg for 7 days; n = 10) or intravenous dexamethasone (IV-DXM; 6 mg/day for 10 days; n = 7). Respiratory and inflammatory parameters were analyzed before and 10 days after treatment. Serum levels of IL-6, malondialdehyde (MDA), and nitric oxide (NO) metabolites (nitrites) were quantified, along with their effects on human microvascular endothelial cells (HMEC-1) incubated with patient or control sera.
Findings
COVID-19 infection significantly increased IL-6 and MDA and reduced NO levels. Only IN-DXM significantly improved respiratory parameters (FiO₂, SatO₂, pO₂) and reduced serum IL-6. Both regimens decreased peripheral inflammatory markers (C-reactive protein, neutrophil-to-lymphocyte ratio and fibrinogen) and increased NO approaching control levels, improving the vascular function. Notably, only sera from IN-DXM–treated patients normalized IL-6 levels in HMEC-1 supernatants to those of controls. Regardless of the administration route, supernatants from HMEC-1 cells incubated with sera from treated patients showed decreased MDA and increased NO compared with those obtained before treatment.
Implications
The IN-DXM regimen produced greater improvement in respiratory and inflammatory parameters than IV-DXM, supporting its potential as a practical and effective alternative for managing severe COVID-19–associated endothelial dysfunction.
{"title":"Experimental Evidence of Dexamethasone in Reversing Endothelial Dysfunction in COVID-19: Therapeutic Insights from Intranasal Administration","authors":"Celeste Trejo-Moreno DSc , Marisol Méndez-Martínez DSc , Zimri A. Alvarado-Ojeda MSc , Sergio Sifontes-Rodríguez PhD , Jaquelynne Cervantes-Torres DSc , Raul J. Bobes DSc , Juan P. Laclette PhD , Edda Sciutto DSc , Gladis Fragoso DSc , Gabriela Rosas-Salgado DSc","doi":"10.1016/j.clinthera.2025.11.005","DOIUrl":"10.1016/j.clinthera.2025.11.005","url":null,"abstract":"<div><h3>Purpose</h3><div>Vascular endothelial dysfunction (ED) plays a critical role in the pathogenesis of severe COVID-19. Intranasal dexamethasone (IN-DXM) has been reported to improve clinical outcomes more efficiently than intravenous (IV-DXM) administration in hospitalized patients. This study compared the efficacy of both regimens in improving ED.</div></div><div><h3>Methods</h3><div>Hospitalized COVID-19 patients from the REVIVAL trial received either intranasal dexamethasone (IN-DXM) via a MAD-Nasal device (0.12 mg/kg for 3 days followed by 0.06 mg/kg for 7 days; <em>n</em> = 10) or intravenous dexamethasone (IV-DXM; 6 mg/day for 10 days; <em>n</em> = 7). Respiratory and inflammatory parameters were analyzed before and 10 days after treatment. Serum levels of IL-6, malondialdehyde (MDA), and nitric oxide (NO) metabolites (nitrites) were quantified, along with their effects on human microvascular endothelial cells (HMEC-1) incubated with patient or control sera.</div></div><div><h3>Findings</h3><div>COVID-19 infection significantly increased IL-6 and MDA and reduced NO levels. Only IN-DXM significantly improved respiratory parameters (FiO₂, SatO₂, pO₂) and reduced serum IL-6. Both regimens decreased peripheral inflammatory markers (C-reactive protein, neutrophil-to-lymphocyte ratio and fibrinogen) and increased NO approaching control levels, improving the vascular function. Notably, only sera from IN-DXM–treated patients normalized IL-6 levels in HMEC-1 supernatants to those of controls. Regardless of the administration route, supernatants from HMEC-1 cells incubated with sera from treated patients showed decreased MDA and increased NO compared with those obtained before treatment.</div></div><div><h3>Implications</h3><div>The IN-DXM regimen produced greater improvement in respiratory and inflammatory parameters than IV-DXM, supporting its potential as a practical and effective alternative for managing severe COVID-19–associated endothelial dysfunction.</div></div>","PeriodicalId":10699,"journal":{"name":"Clinical therapeutics","volume":"48 1","pages":"Pages e10-e15"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145741408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.clinthera.2025.11.003
Ruth Fisher PhD
Purpose
The increasing legalization and use of cannabis necessitate robust, standardized methods for identifying and characterizing cannabis users in research and clinical settings. Variability in user demographics, consumption patterns, and product types complicates comparisons across studies, hindering the development of evidence-based policies and interventions. This commentary aims to highlight the need for urgent development and adoption of uniform methodologies to enhance the reliability and generalizability of cannabis-related research.
Methods
A review was conducted of correlational studies on outcomes associated with cannabis use to assess methods for identifying and characterizing cannabis users in study populations. Gaps in standardization were identified through comparisons of survey tools, self-report measures, health records, and biochemical assays. A review of existing frameworks for characterizing cannabis use was conducted.
Findings
Current methods lack consistency in defining key variables such as “occasional use” or “heavy use” (ranging from monthly to weekly to daily); they fail to capture sufficient nuance in cannabis use patterns, such as lifetime patterns of use, form (eg, flower, concentrate, edibles), dose, and content (eg, THC, CBD) of use; and they fail to identify cannabis users, due to self-report biases, lack of health codes for general cannabis use, and inaccuracies in biological tests. A standardized framework, including the development of validated, easy-to-administer surveys, together with the assurance that study participants are safe from repercussions associated with honestly reporting cannabis use, could address these issues.
Implications
Standardized methods would improve the comparability of cannabis research, enabling meta-analyses and longitudinal studies to inform public health strategies. Consistent user characterization could guide clinical practices, such as tailored interventions for dependence or therapeutic use. Policymakers would benefit from reliable data to shape regulations. There is an urgency for collaborative efforts to develop and adopt global standards for identifying and characterizing cannabis users.
{"title":"What is a “Cannabis User”?","authors":"Ruth Fisher PhD","doi":"10.1016/j.clinthera.2025.11.003","DOIUrl":"10.1016/j.clinthera.2025.11.003","url":null,"abstract":"<div><h3>Purpose</h3><div>The increasing legalization and use of cannabis necessitate robust, standardized methods for identifying and characterizing cannabis users in research and clinical settings. Variability in user demographics, consumption patterns, and product types complicates comparisons across studies, hindering the development of evidence-based policies and interventions. This commentary aims to highlight the need for urgent development and adoption of uniform methodologies to enhance the reliability and generalizability of cannabis-related research.</div></div><div><h3>Methods</h3><div>A review was conducted of correlational studies on outcomes associated with cannabis use to assess methods for identifying and characterizing cannabis users in study populations. Gaps in standardization were identified through comparisons of survey tools, self-report measures, health records, and biochemical assays. A review of existing frameworks for characterizing cannabis use was conducted.</div></div><div><h3>Findings</h3><div>Current methods lack consistency in defining key variables such as “occasional use” or “heavy use” (ranging from monthly to weekly to daily); they fail to capture sufficient nuance in cannabis use patterns, such as lifetime patterns of use, form (eg, flower, concentrate, edibles), dose, and content (eg, THC, CBD) of use; and they fail to identify cannabis users, due to self-report biases, lack of health codes for general cannabis use, and inaccuracies in biological tests. A standardized framework, including the development of validated, easy-to-administer surveys, together with the assurance that study participants are safe from repercussions associated with honestly reporting cannabis use, could address these issues.</div></div><div><h3>Implications</h3><div>Standardized methods would improve the comparability of cannabis research, enabling meta-analyses and longitudinal studies to inform public health strategies. Consistent user characterization could guide clinical practices, such as tailored interventions for dependence or therapeutic use. Policymakers would benefit from reliable data to shape regulations. There is an urgency for collaborative efforts to develop and adopt global standards for identifying and characterizing cannabis users.</div></div>","PeriodicalId":10699,"journal":{"name":"Clinical therapeutics","volume":"48 1","pages":"Pages 22-28"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145687156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.clinthera.2025.11.004
Manan M. Nayak PhD, MA , Peter R. Chai MD, MS , Stephanie Tung MD , Anna Revette PhD , Ilana M. Braun MD
Purpose
Medical cannabis (MC) is used by 1 in 3 patients with cancer. Scientific work suggests a disconnect between patients’ cannabis therapeutics practices and oncologists’ clinical preferences. This qualitative study explores the preferences of patients with cancer as they relate to MC formulations, administration routes, and dosing.
Methods
Semistructured interviews were conducted with patients with cancer consuming MC in 8 states and examined using thematic analysis.
Findings
Among study participants (N = 24), the mean age was 54 years, 67% were female, and 51% had metastatic disease. A powerful theme identified across interviews was of myriad MC dispensary product formulations, triggering astonishment and burden. Common strategies among participants included purchasing and sampling multiple store-bought formulations, modifying dispensary products, and altering intended routes of administration. Preferred dispensary products were not consistently available. Top-cited modes of administration included oral, followed by topical, sublingual, vaporization, combustion, and rectal suppository. Three-quarters of participants alternated between modes. Medical cannabis dosing imprecision represented another powerful theme due to the lack of dispensary quality assurance and accuracy in home measurements.
Implications
This investigation suggests that MC preparations, dosing, and administration routes vary among patients with cancer, and that common consumption patterns (for instance, reliance on multiple routes of cannabis administration) are not rooted in science. Although these findings should be further interrogated, they suggest a need for lay-facing cannabis therapeutics education and standardization of dispensary products to strengthen cannabis-related care.
{"title":"Medical Cannabis Formulations, Administration Routes, and Dosing: Perspectives of Patients With Cancer Who Consume","authors":"Manan M. Nayak PhD, MA , Peter R. Chai MD, MS , Stephanie Tung MD , Anna Revette PhD , Ilana M. Braun MD","doi":"10.1016/j.clinthera.2025.11.004","DOIUrl":"10.1016/j.clinthera.2025.11.004","url":null,"abstract":"<div><h3>Purpose</h3><div>Medical cannabis (MC) is used by 1 in 3 patients with cancer. Scientific work suggests a disconnect between patients’ cannabis therapeutics practices and oncologists’ clinical preferences. This qualitative study explores the preferences of patients with cancer as they relate to MC formulations, administration routes, and dosing.</div></div><div><h3>Methods</h3><div>Semistructured interviews were conducted with patients with cancer consuming MC in 8 states and examined using thematic analysis.</div></div><div><h3>Findings</h3><div>Among study participants (N = 24), the mean age was 54 years, 67% were female, and 51% had metastatic disease. A powerful theme identified across interviews was of myriad MC dispensary product formulations, triggering astonishment and burden. Common strategies among participants included purchasing and sampling multiple store-bought formulations, modifying dispensary products, and altering intended routes of administration. Preferred dispensary products were not consistently available. Top-cited modes of administration included oral, followed by topical, sublingual, vaporization, combustion, and rectal suppository. Three-quarters of participants alternated between modes. Medical cannabis dosing imprecision represented another powerful theme due to the lack of dispensary quality assurance and accuracy in home measurements.</div></div><div><h3>Implications</h3><div>This investigation suggests that MC preparations, dosing, and administration routes vary among patients with cancer, and that common consumption patterns (for instance, reliance on multiple routes of cannabis administration) are not rooted in science. Although these findings should be further interrogated, they suggest a need for lay-facing cannabis therapeutics education and standardization of dispensary products to strengthen cannabis-related care.</div></div>","PeriodicalId":10699,"journal":{"name":"Clinical therapeutics","volume":"48 1","pages":"Pages 51-56"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145741435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.clinthera.2025.10.011
Hitesh Pandya MBChB, MD , Mehul Patel MBBS, PhD, FRCP , Michael Gillen BS, PhD , Jitendar Reddy MPharm , Artur Bednarczyk MD , Marek Kokot MD, MBA , Yubo Tan MSc , Maria Heijer MSc , Magdalena Andersson MSc, MSBA , David Petullo MSc , Mandeep Jassal MD
Purpose
Hydrofluoroalkane-134a (HFA-134a), the propellant in the marketed budesonide/glycopyrronium/formoterol fumarate dihydrate (BGF) formulation, has a global warming potential (GWP) that falls above environmental regulation thresholds and therefore will be phased out. With global efforts to minimize carbon emissions, the hydrofluoroolefin-1234ze (HFO-1234ze) propellant, with a >99% lower GWP than HFA-134a, is in development for pressurized metered-dose inhalers (pMDIs). Spacers support drug delivery in patients with poor pMDI inhalation technique, but it is unknown if BGF exposure with HFO-1234ze exceeds that observed with HFA-134a when using a spacer.
Methods
This Phase I study assessed systemic BGF component exposure with HFO-1234ze versus HFA-134a when using a spacer, and for HFO-1234ze with and without a spacer. Participants (N = 42) were randomized to BGF with HFA-134a with a spacer (reference), HFO-1234ze with a spacer (test), and HFO-1234ze without a spacer (descriptive treatment) over 3 treatment periods in 1 of 6 sequences. As spacer devices help to increase exposure, the upper limit of the 90% confidence interval (CI) of geometric mean ratios (GMRs) was of interest, and bioequivalence was not included as a study objective.
Findings
Analyses demonstrated the upper 90% CI of the GMRs for maximum observed plasma concentration (Cmax) and area under the plasma concentration curve from time zero to the time of the last quantifiable concentration (AUClast) were <125% for all BGF components for HFO-1234ze versus HFA-134a when using a spacer, indicating exposure with HFO-1234ze did not exceed exposure with HFA-134a. Additionally, Cmax was increased for all BGF components with HFO-1234ze when using versus not using a spacer, with the largest increases observed among participants with the lowest exposure when not using a spacer, likely due to poor inhalation technique. No new safety findings, and no deaths or serious adverse events, occurred during the study.
Implications
These findings provide evidence that may help to support the future use of HFO-1234ze propellant in BGF pMDIs.
{"title":"Exposure to Budesonide, Glycopyrronium, and Formoterol With a Next-Generation Propellant Does Not Exceed Exposure With Hydrofluoroalkane-134a Propellant When Administered Via Pressurized Metered-Dose Inhaler With a Spacer","authors":"Hitesh Pandya MBChB, MD , Mehul Patel MBBS, PhD, FRCP , Michael Gillen BS, PhD , Jitendar Reddy MPharm , Artur Bednarczyk MD , Marek Kokot MD, MBA , Yubo Tan MSc , Maria Heijer MSc , Magdalena Andersson MSc, MSBA , David Petullo MSc , Mandeep Jassal MD","doi":"10.1016/j.clinthera.2025.10.011","DOIUrl":"10.1016/j.clinthera.2025.10.011","url":null,"abstract":"<div><h3>Purpose</h3><div>Hydrofluoroalkane-134a (HFA-134a), the propellant in the marketed budesonide/glycopyrronium/formoterol fumarate dihydrate (BGF) formulation, has a global warming potential (GWP) that falls above environmental regulation thresholds and therefore will be phased out. With global efforts to minimize carbon emissions, the hydrofluoroolefin-1234ze (HFO-1234ze) propellant, with a >99% lower GWP than HFA-134a, is in development for pressurized metered-dose inhalers (pMDIs). Spacers support drug delivery in patients with poor pMDI inhalation technique, but it is unknown if BGF exposure with HFO-1234ze exceeds that observed with HFA-134a when using a spacer.</div></div><div><h3>Methods</h3><div>This Phase I study assessed systemic BGF component exposure with HFO-1234ze versus HFA-134a when using a spacer, and for HFO-1234ze with and without a spacer. Participants (<em>N</em> = 42) were randomized to BGF with HFA-134a with a spacer (reference), HFO-1234ze with a spacer (test), and HFO-1234ze without a spacer (descriptive treatment) over 3 treatment periods in 1 of 6 sequences. As spacer devices help to increase exposure, the upper limit of the 90% confidence interval (CI) of geometric mean ratios (GMRs) was of interest, and bioequivalence was not included as a study objective.</div></div><div><h3>Findings</h3><div>Analyses demonstrated the upper 90% CI of the GMRs for maximum observed plasma concentration (Cmax) and area under the plasma concentration curve from time zero to the time of the last quantifiable concentration (AUClast) were <125% for all BGF components for HFO-1234ze versus HFA-134a when using a spacer, indicating exposure with HFO-1234ze did not exceed exposure with HFA-134a. Additionally, Cmax was increased for all BGF components with HFO-1234ze when using versus not using a spacer, with the largest increases observed among participants with the lowest exposure when not using a spacer, likely due to poor inhalation technique. No new safety findings, and no deaths or serious adverse events, occurred during the study.</div></div><div><h3>Implications</h3><div>These findings provide evidence that may help to support the future use of HFO-1234ze propellant in BGF pMDIs.</div></div>","PeriodicalId":10699,"journal":{"name":"Clinical therapeutics","volume":"48 1","pages":"Pages 73-80"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145676351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}