Prescribed doses, no problem.I don't think it can hurt you to take a preventive dose. We do it whenever we think we might be exposed to something. I'll take a dose everyday for 3 days. If you take to much you'll probably get the runs but that's about it. We started doing this since the covid debacle started a rancher friend has been doing this for 20 or 30 years and no ill effect.
My cousin died from ivermectin overdose.
He got sick out on the road doing a job. Probably took enough for a year to get better as the covid got worse over a few days time.
Overdoses of water can kill you too.