Heartworm preventives

Heartworm preventives are medicines used as part of a veterinarian’s plan for heartworm prevention in dogs and cats. Ask your veterinarian to explain your pet’s instructions, what to do if a planned treatment is missed, and how to keep everyone involved in your pet’s care following the same plan. Bring the package if you need help identifying a medicine.

The linked ingredient pages bring together FDA report counts, signs reported after an ingredient, and Green Book product names where available. FDA approves animal drugs and lists them in the Green Book. Brand names are masked in FDA’s public report data; Green Book names do not identify which products the reports concern.

Reports do not prove cause. Counts depend on use and reporting, so they cannot estimate risk or compare products. Use these pages to prepare questions, rather than to rank treatments. Talk to your veterinarian before starting, stopping or changing a medicine. If your pet has an emergency, call your veterinarian or an emergency clinic.

• Ivermectin
• Milbemycin Oxime
• Moxidectin
• Selamectin

These links do not recommend a medicine. Discuss treatment choices with your veterinarian.