However, while convenience is a major perk, heartworm medication isn't just another retail purchase. Because these drugs are regulated, there are a few hoops to jump through—and a few major red flags to avoid—to ensure your pet stays safe. 1. The Prescription Rule (No Shortcuts Allowed)

Protecting Your Pet (and Your Wallet): The Essential Guide to Buying Heartworm Meds Online

Most vets require an annual heartworm blood test before authorizing a refill to ensure the medication is still appropriate for your pet. 2. How the Online Process Works

The most critical thing to know is that in the United States, all effective heartworm preventatives . This isn't just a formality; giving preventative medication to a dog that already has an active heartworm infection can cause a fatal reaction .