We refer to Human Ivermectin anti-parasite and anti-viral oral medicine, recommended by the WHO and used safely by humans for over 40 years. It is often dismissed as horse paste by those who probably know better.
Irishman William Campbell shared the Nobel Prizein 2015 with Satoshi Omura for their discovery of Ivermectin and the millions of human lives it has saved.
Like penicillin and aspirin etc. it is also used for animals, including horses.
The image shows a sample protocol which includes ivermectin.