: Vets ensure the dosage is exactly right for your pet's current weight to prevent accidental underdosing or toxicity.
While you need a prescription, you do not always need to buy the medicine from your vet's office. You can save money by using these methods: Heartworm Basics buy heartworm medicine without vet
The primary reason for a prescription is safety, not just regulation: : Vets ensure the dosage is exactly right
: Administering preventatives to a dog that already has an active heartworm infection can cause a sudden "die-off" of larvae, leading to severe shock or death. leading to severe shock or death.