Avoid animal marketed ivermectin that has salicylanilides or closantel in it. There are only 3 manufacturers of all the brands. Bimeda-MTC makes both Durvet Ivermectin and Bimeda Bimectin, which do not contain salicylanilides or closantel. There's an 11 page thread about it all on another site, which has a lot of info.
Edit: Also be sure to read the Ivermectin contraindications before taking.
https://m.pdr.net/Mobile/Pages/drug-summary/Stromectol-ivermectin-391
Avoid animal marketed ivermectin that has salicylanilides or closantel in it. There are only 3 manufacturers of all the brands. Bimeda-MTC makes both Durvet Ivermectin and Bimeda Bimectin, which do not contain salicylanilides or closantel. There's an 11 page thread about it all on another site, which has a lot of info.