That is an blessing, Anon. The nausea was a herxheimer reaction. I've been taking Ivermectin for years because I handle wildlife everyday and they contact every other thing in creation. But I was using the horse dose, which is below the mg/kg range for humans…when I upped it to 2x (horse or 90% upper human) I got nauseous within a few hours and ill like I'd been poisoned…that must've been the dose that finally killed off the bugs and their death gave me (and likely your friend) a herxheimer reaction.
To verify it was herx and not a tox reaction, I actually took 50% (it has VERY wide safety margin - >10x) and did NOT get sicker, but steadily better over the next day or two. If it was tox, I would've gotten 50% sicker, not better. So the foreign field case guidelines were absolutely spot on wrt dosing.
Steady improvement for the past six weeks or so since the boost. Only one redose since then, but just got another six-pack at Tractor Supply on Monday. Price has gone up, as has the demand. Was $3.49/tube ($3/t in 6pk), now $5/t (still dirt cheap) Had to go to two stores in different counties. Surprisingly the rural (redneck) county was all out. kek They know.