dogs and horses get monthly or quarterly doses because they are constantly re-introduced to parasites
I am surprised that your husband only got one dose. Many times a second dose is prescribed (like 5 days later) in case the parasite left eggs...
Fenbendazole is another anti-parasitic (used mostly for animals but very safe for people) that has amazing anti-cancer properties. I often wonder if that is what R Ginsburg took.
ty 4 info