The second key point to understanding your pet’s heartworm medicine is that they do not actually prevent the heartworm parasite infecting them. Heartworm meds do nothing to deter mosquitoes biting your pets and passing on larval stage heartworms. What they do though, is ensure that any of those parasites are destroyed before they can grow into adults, breed and cause damage to your pet’s internal organs.

There are differences between the active ingredients used in the various heartworm medicines, and how large the larval worms they can deal with. In fact one of the key ingredients, ivermectin is widely used to destroy adult worms in dogs which do have the fully blown version of the disease. But, the dosages used in preventative heartworm meds are so small that only larvae which have been in your pets system for 30 days or less will definitely be destroyed.

This means it is absolutely critical that you re-administer your cat or dogs heartworm meds every 30 days. Failure to do so will mean the next time you do remember to give the treatment it might not be able to destroy all the larvae which have infected your pet. This means that in another seven months or so you may well be facing a heartworm disease positive pet, along with all the long-term health implications that brings.

The key to ensuring your pets never succumb to heartworm disease is to give whatever heartworm meds you choose in a very timely manner.

For more information regarding heartworm pills and heartworm meds visit the Heartworm Dogs & Cats site.