Positive impact of oral hydroxychloroquine and povidone-iodine throat spray for COVID-19 prophylaxis: an open-label randomized trial

4/14 Post Exposure Prophylaxis study (treated after exposure to the virus)

Seet et al., International Journal of Infectious Diseases, doi:10.1016/j.ijid.2021.04.035 (Peer Reviewed)
Positive impact of oral hydroxychloroquine and povidone-iodine throat spray for COVID-19 prophylaxis: an open-label randomized trial

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Prophylaxis RCT in Singapore with 3,037 low risk patients, showing lower serious cases, lower symptomatic cases, and lower confirmed cases of COVID-19 with all treatments (ivermectin, HCQ, PVP-I, and Zinc + vitamin C) compared to vitamin C.

Only 71.4% reported >70% adherence, limiting efficacy.

QTc did not statistically significantly differ between baseline and follow-up readings (mean 379 vs 378ms, paired t-test p=0.387).

Meta-analysis of vitamin C in 6 previous trials shows a benefit of 16%, so the actual benefit of ivermectin, HCQ, and PVP-I may be higher. Cluster RCT with 40 clusters.

There were no hospitalizations and no deaths. NCT04446104.

Seet et al., 4/14/2021, Cluster Randomized Controlled Trial, Singapore, Asia, peer-reviewed, 15 authors, dosage 400mg day 1, 200mg days 2-42, this trial compares with another treatment - results may be better when compared to placebo.

risk of COVID-19 severe case, 35.1% lower, RR 0.65, p = 0.14, treatment 29 of 432 (6.7%), control 64 of 619 (10.3%).

risk of COVID-19 case, 32.0% lower, RR 0.68, p = 0.009, treatment 212 of 432 (49.1%), control 433 of 619 (70.0%), adjusted per study, odds ratio converted to relative risk, model 6.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.

All 344 studies Meta Analysis

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