Usefulness of Topical Ivermectin and Carrageenan to Prevent Contagion of Covid 19 (IVERCAR)

Carvallo et al., NCT04425850, NCT04425850, Oct 2020
ProphylaxisProspective · NCT04425850 · 229 patients · Argentina
Iota-carrageenan for COVID-19
Carvallo et al. NCT04425850 · October 2020
Outcome
Improvement
Relative Risk · 95% CI
Case
96%0.04 · 0.00–0.63
00.511.52+
← Iota-carrageenan
reduces riskIota-carrageenan
increases risk →
Fewer cases with iota-carrageenan + ivermectin
p = 0.000063
See also
The secret plot to hide the effectiveness of ivermectin in the country
Prophylaxis study using ivermectin and carrageenan showing 0 of 131 cases from treated healthcare workers, compared to 11 of 98 control.
The effect may be primarily due to ivermectin - the author later reported that carrageenan is not necessary1.
See2 for discussion of issues with this trial.
Targeted administration to the respiratory tract provides treatment directly to the typical source of initial SARS-CoV-2 infection and replication, and allows for rapid onset of action, higher local drug concentration, and reduced systemic side effects.
This study is excluded in meta-analysis: combined treatment may significantly contribute to efficacy, concern about potential data issues.
Important missing comments or errors? Let us know.
Study covers iota-carrageenan and ivermectin.
risk of case, 96.3% lower, RR 0.04, p < 0.001, treatment 0 of 131 (0.0%), control 11 of 98 (11.2%), NNT 8.9, relative risk is not 0 because of continuity correction due to zero events (with reciprocal of the contrasting arm).
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
Carvallo et al., 19 Oct 2020, prospective, Argentina, preprint, 1 author, this trial uses multiple treatments in the treatment arm (combined with ivermectin) - results of individual treatments may vary, trial NCT04425850 (history).
$0 $500 $1,000+ Efficacy vs. cost for COVID-19 treatment protocols c19early.org October 2026 Argentina Angola Colombia Kenya Mozambique Myanmar South Africa Peru Philippines USA Vietnam Iran Bangladesh Ethiopia Ghana Germany Mexico South Korea United Kingdom Saudi Arabia Algeria Morocco Yemen Poland Uzbekistan India China Venezuela DR Congo Madagascar Thailand Uganda Egypt Nigeria Taiwan Fiji Zambia Bosnia-Herzegovina Dominican Republic Bolivia Côte d'Ivoire Eritrea Togo Bulgaria Greece Slovakia Iceland New Zealand Trinidad and Tobago Mongolia Czechia Belarus Israel Haiti North Macedonia Hong Kong Qatar Panama Serbia Argentina favored high-profit treatments.The average efficacy of treatments was very low.High-cost protocols reduce early treatment, andforgo complementary/synergistic benefits. More effective More expensive 75% 50% 25% ≤0%
$0 $500 $1,000+ Efficacy vs. cost for COVID-19treatment protocols worldwide c19early.org October 2026 Argentina Angola Colombia Kenya Mozambique Myanmar South Africa Peru Philippines USA Spain Iran Bangladesh Ethiopia Ghana Germany Mexico South Korea United Kingdom Saudi Arabia Algeria Morocco Yemen Poland Uzbekistan India China Venezuela DR Congo Madagascar Thailand Uganda Egypt Taiwan Dominican Rep. Bolivia Côte d'Ivoire Eritrea Togo Sri Lanka Bulgaria Greece Slovakia New Zealand Trinidad and Tobago Mongolia Czechia Belarus Israel North Macedonia Hong Kong Qatar Panama Serbia Argentina favored high-profit treatments.The average efficacy was very low.High-cost protocols reduce early treatment,and forgo complementary/synergistic benefits. More effective More expensive 75% 50% 25% ≤0%
Please send us corrections, updates, or comments. c19early involves the extraction of 200,000+ datapoints from thousands of papers. Community updates help ensure high accuracy. Treatments and other interventions are complementary. All practical, effective, and safe means should be used based on risk/benefit analysis. No treatment or intervention is 100% available and effective for all current and future variants. We do not provide medical advice. Before taking any medication, consult a qualified physician who can provide personalized advice and details of risks and benefits based on your medical history and situation. IMA and WCH provide treatment protocols.
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