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All Studies   Meta Analysis    Recent:   

Identification of antiviral antihistamines for COVID-19 repurposing

Reznikov et al., Biochemical and Biophysical Research Communications, doi:10.1016/j.bbrc.2020.11.095
Jan 2021  
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Case, all medications and.. 34% Improvement Relative Risk Case, hydroxyzine, 61+ 37% Case, hydroxyzine, 31-60 17% Case, brompheniramine.. 48% Case, cetirizine, 61+ 52% Case, cetirizine, 31-60 43% Case, fexofenadine, 61+ 62% Case, fexofenadine, 31-60 -33% Case, loratadine, 61+ 34% Case, loratadine, 31-60 26% Case, diphenhydramine.. 35% Case, diphenhydramine, 3.. 14% Case, levocetirizine, 61+ 74% Case, levocetirizine, 31-60 78% Case, chlorpheniramine.. 36% Case, chlorphenirami.. (b) 8% Case, azelastine, 61+ 59% Case, azelastine, 31-60 29% Antihistamine H1RAs  Reznikov et al.  Prophylaxis Do antihistamine H1RAs reduce COVID-19 infections? Retrospective study in the USA Fewer cases with antihistamine H1RAs (p<0.000001) c19early.org Reznikov et al., Biochemical and Bioph.., Jan 2021 Favorsantihistamine H1RA Favorscontrol 0 0.5 1 1.5 2+
10th treatment shown to reduce risk in December 2020
 
*, now with p = 0.00006 from 15 studies.
Lower risk for mortality, recovery, and cases.
No treatment is 100% effective. Protocols combine treatments. * >10% efficacy, ≥3 studies.
5,000+ studies for 104 treatments. c19early.org
Retrospective 219,000 patients showing lower risk of COVID-19 with antihistamine H1RA use.
In Vitro study showing these drugs exhibit direct antiviral activity against SARS-CoV-2. Molecular docking suggests hydroxyzine and azelastine may exert antiviral effects by binding ACE2 and the sigma-1 receptor.
12 preclinical studies support the efficacy of antihistamine H1RAs for COVID-19:
risk of case, 34.0% lower, RR 0.66, p < 0.001, adjusted per study, all medications and age groups combined.
risk of case, 36.7% lower, OR 0.63, p = 0.01, adjusted per study, inverted to make OR<1 favor treatment, hydroxyzine, 61+, multivariable, RR approximated with OR.
risk of case, 16.7% lower, OR 0.83, p = 0.24, adjusted per study, inverted to make OR<1 favor treatment, hydroxyzine, 31-60, multivariable, RR approximated with OR.
risk of case, 47.9% lower, OR 0.52, p = 0.27, adjusted per study, inverted to make OR<1 favor treatment, brompheniramine , 31-60, multivariable, RR approximated with OR.
risk of case, 52.2% lower, OR 0.48, p < 0.001, adjusted per study, inverted to make OR<1 favor treatment, cetirizine, 61+, multivariable, RR approximated with OR.
risk of case, 42.9% lower, OR 0.57, p < 0.001, adjusted per study, inverted to make OR<1 favor treatment, cetirizine, 31-60, multivariable, RR approximated with OR.
risk of case, 62.3% lower, OR 0.38, p = 0.13, adjusted per study, inverted to make OR<1 favor treatment, fexofenadine, 61+, multivariable, RR approximated with OR.
risk of case, 33.3% higher, OR 1.33, p = 0.58, adjusted per study, inverted to make OR<1 favor treatment, fexofenadine, 31-60, multivariable, RR approximated with OR.
risk of case, 34.2% lower, OR 0.66, p = 0.008, adjusted per study, inverted to make OR<1 favor treatment, loratadine, 61+, multivariable, RR approximated with OR.
risk of case, 26.5% lower, OR 0.74, p = 0.04, adjusted per study, inverted to make OR<1 favor treatment, loratadine, 31-60, multivariable, RR approximated with OR.
risk of case, 35.5% lower, OR 0.65, p < 0.001, adjusted per study, inverted to make OR<1 favor treatment, diphenhydramine, 61+, multivariable, RR approximated with OR.
risk of case, 13.8% lower, OR 0.86, p = 0.13, adjusted per study, inverted to make OR<1 favor treatment, diphenhydramine, 31-60, multivariable, RR approximated with OR.
risk of case, 73.6% lower, OR 0.26, p = 0.05, adjusted per study, inverted to make OR<1 favor treatment, levocetirizine, 61+, multivariable, RR approximated with OR.
risk of case, 78.3% lower, OR 0.22, p = 0.0496, adjusted per study, inverted to make OR<1 favor treatment, levocetirizine, 31-60, multivariable, RR approximated with OR.
risk of case, 36.3% lower, OR 0.64, p = 0.19, adjusted per study, inverted to make OR<1 favor treatment, chlorpheniramine, 61+, multivariable, RR approximated with OR.
risk of case, 8.3% lower, OR 0.92, p = 0.81, adjusted per study, inverted to make OR<1 favor treatment, chlorpheniramine, 31-60, multivariable, RR approximated with OR.
risk of case, 58.8% lower, OR 0.41, p < 0.001, adjusted per study, inverted to make OR<1 favor treatment, azelastine, 61+, multivariable, RR approximated with OR.
risk of case, 28.6% lower, OR 0.71, p = 0.17, adjusted per study, inverted to make OR<1 favor treatment, azelastine, 31-60, multivariable, RR approximated with OR.
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
Reznikov et al., 31 Jan 2021, retrospective, USA, peer-reviewed, 9 authors.
This PaperH1RAsAll
Identification of antiviral antihistamines for COVID-19 repurposing
Leah R Reznikov, Michael H Norris, Rohit Vashisht, Andrew P Bluhm, Danmeng Li, Yan-Shin J. Liao, Ashley Brown, Atul J Butte, David A Ostrov
Biochemical and Biophysical Research Communications, doi:10.1016/j.bbrc.2020.11.095
a b s t r a c t There is an urgent need to identify therapies that prevent SARS-CoV-2 infection and improve the outcome of COVID-19 patients. Although repurposed drugs with favorable safety profiles could have significant benefit, widely available prevention or treatment options for COVID-19 have yet to be identified. Efforts to identify approved drugs with in vitro activity against SARS-CoV-2 resulted in identification of antiviral sigma-1 receptor ligands, including antihistamines in the histamine-1 receptor binding class. We identified antihistamine candidates for repurposing by mining electronic health records of usage in population of more than 219,000 subjects tested for SARS-CoV-2. Usage of diphenhydramine, hydroxyzine and azelastine was associated with reduced incidence of SARS-CoV-2 positivity in subjects greater than age 61. We found diphenhydramine, hydroxyzine and azelastine to exhibit direct antiviral activity against SARS-CoV-2 in vitro. Although mechanisms by which specific antihistamines exert antiviral effects is not clear, hydroxyzine, and possibly azelastine, bind Angiotensin Converting Enzyme-2 (ACE2) and the sigma-1 receptor as off-targets. Clinical studies are needed to measure the effectiveness of diphenhydramine, hydroxyzine and azelastine for disease prevention, for early intervention, or as adjuvant therapy for severe COVID-19.
Appendix A. Supplementary data Supplementary data related to this article can be found at https://doi.org/10.1016/j.bbrc.2020.11.095.
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