Never heard of it so probably not a great recreational drug. Oooh Wikipedia confirms
Mebendazole is a highly effective, broad-spectrum antihelmintic indicated for the treatment of nematode infestations
Mebendazole sometimes causes diarrhea, abdominal pain, and elevated liver enzymes. In rare cases, it has been associated with a dangerously low white blood cell count, low platelet count, and hair loss,[14][15] with a risk of agranulocytosis in rare cases.
Depending on his weight that could be quite a high dose of ivermectin (the normal dose is 0.2mg/kg) but that seems like an extreme reaction.
I see four possibilities:
Or the company who sold it sold fake or cut drugs.
He also has mebendezol
Never heard of it so probably not a great recreational drug. Oooh Wikipedia confirms
I like the implication that you’re familiar with all the good recreational drugs
IRL or on Dreddit, I’d be happy to share some crazy stories
My money is on the last one