HeartRx (Pimobendan): What Dog Owners Should Know

HeartRx contains pimobendan, a prescription medication used to support dogs with heart disease, particularly congestive heart failure (CHF) caused by mitral valve disease (MVD) or dilated cardiomyopathy (DCM). Because pimobendan is a prescription drug, it should only be used under the direction and ongoing supervision of a licensed veterinarian.

What Pimobendan Does

Pimobendan works by improving the strength of heart muscle contractions while also helping to widen blood vessels, easing the workload on a failing heart. It is one of the most widely used and researched medications in veterinary cardiology for dogs with MVD- or DCM-related heart failure, and it is typically prescribed alongside other heart medications as part of a broader treatment plan set by your vet.

Conditions Pimobendan Is Used For

Pimobendan is most commonly prescribed for dogs diagnosed with congestive heart failure secondary to mitral valve disease, one of the most common heart conditions in small and toy dog breeds, and for dogs with dilated cardiomyopathy, which is more common in larger breeds. A veterinary diagnosis, usually including a physical exam, chest X-rays, and often an echocardiogram, is the necessary first step before starting treatment.

Potential Side Effects to Discuss With Your Vet

As with any prescription medication, pimobendan can cause side effects in some dogs, which may include reduced appetite, lethargy, diarrhea, or changes in heart rhythm. Every dog responds differently, and your veterinarian is best positioned to weigh the risks and benefits for your dog's specific diagnosis, monitor bloodwork and heart function over time, and adjust the treatment plan as needed. Never start, stop, or change a pimobendan dose without veterinary guidance.

Getting HeartRx Through RX Sciences

HeartRx is available through RX Sciences as a pimobendan option for dogs with a valid veterinary prescription. If your dog has been diagnosed with MVD- or DCM-related heart disease, talk to your veterinarian about whether pimobendan is appropriate, and ask them about HeartRx as part of that conversation.