I think their business is over .
look at it this way- trust Pharma Co.'s who could alter the strength, give placebos, f with the drug at the request of gubmint OR trust animal vet product producers who if their product does not work they go out of business.
watch the diarrhea (3 to 4 days in) if this is your first course and the farting is off the charts. you may even see your parasites in the bowl. 2nd time around this does not happen as bad.
oh yea . you have nothing to worry about then