[bohica1]

Ivermectin is the main ingredient in Heartgard to prevent heartworms in dogs. I just checked and its not listed in NexGard [for fleas & ticks].

[Varda]

I use ivermectin for heartworms and for giardia. It's good for protozoans and nematodes in general. We have problems with ticks and Lyme here. I wish it would work on them.