Yeah I thought the guy was talking out of his ass when he brought up it being against the law like so many "legal" expert goofs have been acting up lately. I'm not really pro or con when it comes to Ivermectin, I just think this was a bad look on the Pharmacy...
If the pharmacy has a limited supply of a particular med that patients with proven benefit need, it's not a terrible idea for them to not fill it for a reason that has no major medical group or FDA approval supporting it.
Similar limitations were put on hydroxychloroquine last year when rheumatology patients and lupus patients couldn't get their medications because everybody was chasing hydroxychloroquine.
Unlike hydroxychloroquine I've remained in this much less demand day-to-day. But I bet the pharmacy typically carries a lot less of it too.