I've read that some people believe generic pour-ons aren't as effective as name-brand dewormers. Do you have any idea why that would be the case? The major ingredient appears to be the same, so I wouldn't expect much difference in them.
Generic toilet paper contains the same ingredients as the name brands, but some generic TP is only good for light sanding and not much else.
Drugs are obviously much more regulated than toilet paper, but the idea is the same. There can be many differences in how a ...