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Iverhart MAX by Virbac are palatable chewable tablets guaranteed to prevent canine heartworm disease by eliminating the tissue stage of heartworm larvae for a month after infection and for treatment and control of roundworms, hookworms, and tapeworms. Each tablet contains 3 anthelmintics (ivermectin/pyrantel pamoate/praziquantel). Recommended for dogs 8 weeks of age and older. For dogs over 100 lbs. use the appropriate combination of these chewable tablets.