The active ingredient in Wormshield is Ivermectin, which is also found in Heartgard, which we sell (
http://goo.gl/rYcoQ7), although Ivermectin does not control Tapeworm. Milbemax contains Praziquantel, which causes tapeworms to muscle spasm and are then digested. So the ingredients differ, as does the process, however we suggest asking your vet if your dog will be ok with these two active ingredients together. It is important that your dog is assessed before administering a range of ingredients together.
By Cynthkel8 on 18 Dec 2012