https://www.fda.gov/consumers/consumer-updates/why-you-should-not-use-ivermectin-treat-or-prevent-covid-19

Here’s What You Need to Know about Ivermectin

• FDA has not approved ivermectin for use in treating or preventing COVID-19 in humans. Ivermectin tablets are approved at very specific doses for some parasitic worms, and there are topical (on the skin) formulations for head lice and skin conditions like rosacea. Ivermectin is not an anti-viral (a drug for treating viruses).
• Taking large doses of this drug is dangerous and can cause serious harm. 
• If you have a prescription for ivermectin for an FDA-approved use, get it from a legitimate source and take it exactly as prescribed. 
• Never use medications intended for animals on yourself. Ivermectin preparations for animals are very different from those approved for humans.