If one purchases the dewormers from an online store, there is no way to get the wrong ingredients if one sticks to these brands, Equimax, which contains the horse paste, not pills. Equimax is Praziquantel 14.03% & Ivermectin 1.78%.
Safeguard brand of Fenbendazole 10% horse paste.
Safeguard brand Pamoate Pyrantel or Strongyid paste for horses.
They cost under 10$ per tube, not exactly worth counterfeiting them, and the cost of the specialty tubes cannot be considered without attorneys signing off on the copyright.