WARNING: Adverse reactions to COMFORTIS when combined with IVERMECTIN

Here's the FDA report: (link)

The warning is being cross-posted for dog owners that dispense separate oral flea & tick preventatives along with Ivermectin (which in its oral form is dispensed monthly as a heartworm preventative, though some veterinarians also use it to treat manges).

As always, it's best to stay current on these kinds of topics, and please cross-post the link to other pet forums you happen to peruse.