Trial reportLancet (London, England)2021
Inhaled budesonide for COVID-19 in people at high risk of complications in the community in the UK (PRINCIPLE): a randomised, controlled, open-label, adaptive platform trial.
Trial report in Lancet (London, England), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 180 papers, 13 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
180 citing papers in PubMed, 13 syntheses or guidelines pooled it, 303 citations in OpenAlex.
- Effectiveness of oral and inhaled repurposed and antiviral pharmaceutical treatments for acute SARS-CoV-2 in outpatient settings: a systematic review of 124 randomized trials.BMC infectious diseases · 2026Pooled it
- Washing Illness Away: A Systematic Review of the Impact of Nasal Irrigation and Spray on COVID-19.The Laryngoscope · 2025Pooled it
- AGIHO guideline on evidence-based management of COVID-19 in cancer patients: 2022 update on vaccination, pharmacological prophylaxis and therapy in light of the omicron variants.European journal of cancer (Oxford, England : 1990) · 2023Guideline
- Comparison of Preprint Postings of Randomized Clinical Trials on COVID-19 and Corresponding Published Journal Articles: A Systematic Review.JAMA network open · 2023Pooled it
- Clinical efficacy of inhaled corticosteroids in patients with coronavirus disease 2019: A living review and meta-analysis.PloS one · 2023Pooled it
- Effect of anti-inflammatory drugs on the storm of inflammatory factors in respiratory tract infection caused by SARS-CoV-2: an updated meta-analysis.Frontiers in public health · 2023Pooled it
- Inhaled corticosteroids' effect on COVID-19 patients: A systematic review and meta-analysis of randomized controlled trials.Canadian journal of respiratory therapy : CJRT = Revue canadienne de la therapie respiratoire : RCTR · 2023Pooled it
- Risk of serious COVID-19 outcomes among adults and children with moderate-to-severe asthma: a systematic review and meta-analysis.European respiratory review : an official journal of the European Respiratory Society · 2022Pooled it
- Effect of corticosteroid therapy on mortality in COVID-19 patients-A systematic review and meta-analysis.Reviews in medical virology · 2022Pooled it
- Inhaled corticosteroids for outpatients with COVID-19: a meta-analysis.The European respiratory journal · 2022Pooled it
- Inhaled corticosteroids for the treatment of COVID-19.The Cochrane database of systematic reviews · 2022Pooled it
- Systemic administration of glucocorticoids, cardiovascular complications and mortality in patients hospitalised with COVID-19, SARS, MERS or influenza: A systematic review and meta-analysis of randomised trials.Pharmacological research · 2022Pooled it
- Efficacy of COVID-19 Treatments: A Bayesian Network Meta-Analysis of Randomized Controlled Trials.Frontiers in public health · 2021Pooled it
- Oral Nirmatrelvir-Ritonavir for Covid-19 in Higher-Risk Outpatients.The New England journal of medicine · 2026Trial
- A bidimensional early intervention strategy of standard of care in combination with corticosteroids in elderly patients with mild to moderate COVID-19 (BEAT-COV study): a multicentre, open-label, randomized controlled trial.BMC infectious diseases · 2026Trial
- Inhaled Ciclesonide for Community-Based COVID-19: A Placebo-Controlled Randomised Trial.Respirology (Carlton, Vic.) · 2026Trial
- Efficacy and safety of combined nebulization of unfractionated heparin, acetylcysteine, budesonide and ipratropium bromide in hospitalised patients with COVID-19 pneumonia: a randomized controlled clinical trial.BMC pulmonary medicine · 2025Trial
- Identification of HIF1A as a therapeutic target during SARS-CoV-2-associated lung injury.JCI insight · 2025Trial
- Ivermectin for COVID-19 in adults in the community (PRINCIPLE): An open, randomised, controlled, adaptive platform trial of short- and longer-term outcomes.The Journal of infection · 2024Trial
- Trial
120 more citing papers are in PubMed but not listed here.
Corrections and comments
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- Erratum issued
Authors and funding
27 authors at 7 institutions in 4 countries.
Funding
Abstract
backgroundA previous efficacy trial found benefit from inhaled budesonide for COVID-19 in patients not admitted to hospital, but effectiveness in high-risk individuals is unknown. We aimed to establish whether inhaled budesonide reduces time to recovery and COVID-19-related hospital admissions or deaths among people at high risk of complications in the community.
methodsPRINCIPLE is a multicentre, open-label, multi-arm, randomised, controlled, adaptive platform trial done remotely from a central trial site and at primary care centres in the UK. Eligible participants were aged 65 years or older or 50 years or older with comorbidities, and unwell for up to 14 days with suspected COVID-19 but not admitted to hospital. Participants were randomly assigned to usual care, usual care plus inhaled budesonide (800 μg twice daily for 14 days), or usual care plus other interventions, and followed up for 28 days. Participants were aware of group assignment. The coprimary endpoints are time to first self-reported recovery and hospital admission or death related to COVID-19, within 28 days, analysed using Bayesian models. The primary analysis population included all eligible SARS-CoV-2-positive participants randomly assigned to budesonide, usual care, and other interventions, from the start of the platform trial until the budesonide group was closed. This trial is registered at the ISRCTN registry (ISRCTN86534580) and is ongoing.
findingsThe trial began enrolment on April 2, 2020, with randomisation to budesonide from Nov 27, 2020, until March 31, 2021, when the prespecified time to recovery superiority criterion was met. 4700 participants were randomly assigned to budesonide (n=1073), usual care alone (n=1988), or other treatments (n=1639). The primary analysis model includes 2530 SARS-CoV-2-positive participants, with 787 in the budesonide group, 1069 in the usual care group, and 974 receiving other treatments. There was a benefit in time to first self-reported recovery of an estimated 2·94 days (95% Bayesian credible interval [BCI] 1·19 to 5·12) in the budesonide group versus the usual care group (11·8 days [95% BCI 10·0 to 14·1] vs 14·7 days [12·3 to 18·0]; hazard ratio 1·21 [95% BCI 1·08 to 1·36]), with a probability of superiority greater than 0·999, meeting the prespecified superiority threshold of 0·99. For the hospital admission or death outcome, the estimated rate was 6·8% (95% BCI 4·1 to 10·2) in the budesonide group versus 8·8% (5·5 to 12·7) in the usual care group (estimated absolute difference 2·0% [95% BCI -0·2 to 4·5]; odds ratio 0·75 [95% BCI 0·55 to 1·03]), with a probability of superiority 0·963, below the prespecified superiority threshold of 0·975. Two participants in the budesonide group and four in the usual care group had serious adverse events (hospital admissions unrelated to COVID-19).
interpretationInhaled budesonide improves time to recovery, with a chance of also reducing hospital admissions or deaths (although our results did not meet the superiority threshold), in people with COVID-19 in the community who are at higher risk of complications.
fundingNational Institute of Health Research and United Kingdom Research Innovation.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.