How do heartworm preventatives work?

Preventive medications are available for once monthly administration. These medications act in slightly different biochemical ways, but each works to prevent adult heartworm development within the host. Common monthly heartworm preventatives that are administered orally include Heartgard®, Intercepter®, or Iverhart®.

Revolution® is a "spot-on" product that is labeled as effective for heartworm prevention, and is applied topically once monthly. The doctor will advise you on the best means of control for your pet. More.

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