What are the side effects of heartworm medicine?

Answer by  Bootsand (42)

Side effects listed for heartworm preventative drugs range from vomiting, diarrhea, convulsions, weakness and even seizures, generally from dosing too much for a dogs weight.

Answer by  HelpfulAndy (1107)

Don't worry about the side effects if your dog needs it. The side effects are minimal, but you may find that your dog is a bit gassy.

Answer by  Vanessa (387)

Some dogs may experience mild stomach discomfort. Most of the time there are no side effects from heart worm medication.

Answer by  heatherbooboo (655)

I have given my three dogs interceptor brand hearth worm medicine for over seven years. I have seen no side effects at all. They don't show any change when taking hearth worm medicine.