Ivermectin is used in heartworm medicine for dogs.
A couple billion doses have been given to people over the last several decades. Ivermectin is quite safe.
Used for horses and many other animals too.
It’s an anti-parasitic. Inhibits the ACE-2 receptor which effectively closes the door on pathogens entering the cell.
When used with Zinc, it blocks the virus from using the cell machinery to replicate.