Will Falconer, DVM Moderator
Hi Megan,
While I think it's possible there could be prior drug interactions here, I also see that Trifexis alone is a significantly toxic drug without a prior drug history. You can see, even in the comment above from JB about an 8 mo. old pup, it can cause mayhem with health all by itself.
The key I think is that when research is done by a company selling a drug, that research will never be unbiased: the profit motive takes over and that's a larger incentive than finding the truth and reporting it. Data can be and regularly is skewed to make a good show of the profitable drug.
Thanks for joining the discussion, and all the best in your training and future research.