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HCQ study #182 of 280
11/6 Post Exposure Prophylaxis study (treated after exposure to the virus)
Dhibar et al., International Journal of Antimicrobial Agents, doi:10.1016/j.ijantimicag.2020.106224 (Peer Reviewed)
Post Exposure Prophylaxis with Hydroxychloroquine (HCQ) for the Prevention of COVID-19, a Myth or a Reality? The PEP-CQ Study
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41% reduction in cases with HCQ PEP. Prospective open label trial with 132 HCQ patients and 185 control patients showing RR 0.59, p=0.03.
50% reduction in PCR+ cases, 44% reduction in symptomatic cases.
No serious adverse events. Relatively low dosage, the PEP group received HCQ 800mg on day one followed by 400mg once weekly for 3 weeks. NCT04408456

Dhibar et al., 11/6/2020, prospective, India, South Asia, peer-reviewed, 13 authors.
risk of COVID-19 case, 41.0% lower, RR 0.59, p = 0.03, treatment 14 of 132 (10.6%), control 36 of 185 (19.5%), adjusted per study.
risk of COVID-19 case, 50.0% lower, RR 0.50, p = 0.04, treatment 10 of 132 (7.6%), control 28 of 185 (15.1%), adjusted per study, PCR+.
risk of symptomatic case, 43.9% lower, RR 0.56, p = 0.21, treatment 6 of 132 (4.5%), control 15 of 185 (8.1%), adjusted per study.

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.
Details of all 280 studies    Meta analysis
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