Going to put this out there for anyone who might have trouble with the pharmacy sites. I bought a bottle of ivermectin from Tractor Supply, the clerk ordered it for me inside the store on their own website because they were out of stock. Had cv in September, had headaches that would not stop for months afterwards, nothing helped - so after purchasing the liquid (yes it says it is for cattle) but you can adjust the dosage according to weight, I took several doses over several days. The headaches stopped completely. I am sold on it. Since then if I start feeling a headache coming on I take some for a couple of days, no side effects and no headaches............