The East Virginia Medical School COVID protocol has recommended ivermectin as a treatment for months now. But this is new: The EVMS protocol now recommends ivermectin for prophylaxis (prevention) too!

For treatment, the EVMS protocol says:
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Optional: Ivermectin 150-200 ug/kg orally (dose can be repeated on day 2) [40-45]
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For a 150-pound person, that dosage equals 10.2-13.6 mg. A typical pill dosage is 12 mg.

For prophylaxis (prevention), the EVMS protocol says:
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Optional: Ivermectin for postexposure prophylaxis (see ClinTrials.gov NCT04422561)
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The Borody protocol suggests to take the usual dose of ivermectin (as stated above) once every fortnight (two weeks).