Per the iMASK protocol, they recommend taking 0.2 mg/kg per dose twice a week for prevention.

https://covid19criticalcare.com/covid-19-protocols/i-mask-plus-protocol/

200lb = approximately 90kg. 90kg x 0.2mg = 18mg of ivermectin per dose.

So, 18mg twice a week for prevention.

If using the horse paste, each notch dispenses roughly 4mg:

https://www.americanpartisan.org/2021/08/ivermectin-treatment-protocols/

Per the iMASK protocol, they recommend taking 0.2 mg/kg per dose twice a week for prevention.

https://covid19criticalcare.com/covid-19-protocols/i-mask-plus-protocol/

200lb = approximately 90kg. 90kg x 0.2mg = 18mg of ivermectin per dose.

So, 18mg twice a week for prevention.