While some online pharmacies are trustworthy, others have questionable ethics and have been under scrutiny by state legislatures. Medications purchased online may have been obtained from “black market” resources and are not approved by the FDA. Never use a product that does not have the FDA warning on the label. It states “Caution: Federal law restricts this drug to be used by or on the order of a licensed veterinarian”. Additionally, pharmaceutical manufacturers will only honor product guarantees when purchased from your veterinarian’s office. Recently, we have noted an increase in cases of heartworms where the owners had been buying the heartworm preventative online. Because of this, the pharmaceutical companies were unwilling to contribute to the cost of the treatment. Your vet can genuinely guarantee that the medication they sell for your pet is safe.