Ivermectin can be used as a prophylactic against COVID.

Ivermectin reduced the risk of contagion with COVID-19 by 74% compared to the control group (HR 0.26, 95% CI [0.10, 0.71]).

Ivermectin as a SARS-CoV-2 Pre-Exposure Prophylaxis Method in Healthcare Workers: A Propensity Score-Matched Retrospective Cohort Study

In studies comparing ivermectin plus standard treatment vs. standard treatment, there were 14 deaths among 681 patients receiving ivermectin, and 53 deaths among 619 patients receiving standard treatment.

Ivermectin for Prophylaxis and Treatment of COVID-19: A Systematic Review and Meta-Analysis

Results from three studies (736 subjects) showed that prophylaxis with ivermectin increased the likelihood of preventing COVID-19 compared to controls (low quality of evidence). Serious adverse events were rarely reported both in ivermectin and controls.

Ivermectin for Prophylaxis and Treatment of COVID-19: A Systematic Review and Meta-Analysis

Two doses of oral ivermectin (300 μg/kg/dose given 72 hours apart) as chemoprophylaxis among HCWs reduced the risk of COVID-19 infection by 83% in the following month. Safe, effective, and low-cost chemoprophylaxis has relevance in the containment of pandemic alongside vaccine.

Prophylactic Role of Ivermectin in Severe Acute Respiratory Syndrome Coronavirus 2 Infection Among Healthcare Workers

Given the effectiveness of such an inexpensive medication, the vaccine trials appear to be, at least, a horrendous waste of money. At worst–a failed experiment (Ivermectin seems to have better efficacy against mortality and severe disease than the vaccines).