While the prescription must come from a vet, you are not required to buy the medicine directly from their clinic. You can use your prescription at:
Why Heartworm Preventatives Need a Prescription - VetRxDirect can you buy heartworm medicine over the counter
: Giving preventative medication to a pet that already has adult heartworms can cause a sudden massive die-off of larvae. This can trigger a severe, shock-like reaction that may be fatal . While the prescription must come from a vet,
Because of these risks, most veterinarians require an before issuing or renewing a prescription. can you buy heartworm medicine over the counter
: A veterinarian ensures the preventative won't have dangerous interactions with other medications your pet may be taking.