Mavacor™ (Mavacamten) — Obstructive HCM Therapy for Cats
A cardiac myosin inhibitor for cats diagnosed with obstructive HCM. Titrated individually by the veterinarian with echocardiographic follow-up — alongside your cardiologist.
A different lever on the same disease
Mavacamten is a cardiac myosin inhibitor: it acts directly on the contractile protein of the heart muscle, easing the excessive contraction that, in the obstructive form of hypertrophic cardiomyopathy, narrows the outflow tract while the heart squeezes. In human medicine the molecule is fully approved for obstructive HCM. In cats it is investigational: published feline studies are small and early, showing reduced outflow-tract obstruction after dosing — a real signal, and not yet a settled treatment. No medicine anywhere is licensed to treat feline HCM.
What rapamycin therapy actually costs
$369
This product is not yet available for online purchase.
How it differs from our rapamycin therapy
The two act on different parts of the disease, and a cardiologist chooses between them — or neither. Rapamycin is studied for slowing the thickening of the heart wall in subclinical disease. Mavacamten addresses the obstruction itself in cats whose HCM is obstructive. One is aimed at the course of the disease, the other at its mechanics.
Where this fits
- For cats with a diagnosed, obstructive form of HCM — confirmed by echocardiography, not suspected from a murmur.
- It does not replace your cardiologist. Dosing is set low and adjusted individually, and every adjustment is guided by echocardiographic follow-up.
- Because the mechanism reduces the force of contraction, cats with reduced systolic function are not candidates, and the veterinary review screens for this before anything is dispensed.
How the therapy works
A small once-daily oral tablet (1 mg strength). The dose is fractions of a tablet, titrated by the prescribing veterinarian from the cat’s weight, response and echo findings — there is no fixed program strength, by design.
Veterinary oversight, included
Every order begins with a licensed veterinarian’s review of your cat’s history and cardiac workup. Cats without a confirmed obstructive HCM diagnosis, and cats whose echo shows reduced contractile function, are declined. Medication is dispensed under veterinary prescription. Lab-tested to a 99.9% purity standard.
Product information
| Indication | Positioned for cats with a confirmed obstructive HCM diagnosis |
|---|---|
| Evidence | Investigational in cats — the molecule is approved for obstructive HCM in human medicine |
| Form | Oral tablet, 1 mg |
| Schedule | Once daily; dose titrated individually by the veterinarian with echo follow-up |
| Alongside | Works with your cardiologist’s care, not instead of it |
| Purity | Lab-tested to a 99.9% standard, every batch |
| Status | Prescription medicine, dispensed under veterinary direction |
📦 Shipping time & tracking
- Every parcel ships fully tracked — the tracking number is emailed the moment the label is created.
- Flat €30 shipping worldwide, shown up front — no surprise fees at checkout.
- Your box ships once the veterinary review clears; the delivery windows below are counted from dispatch.
What cat owners say
Individual results vary. These are members’ own experiences, not medical claims or expected outcomes.
Miso is 14 and honestly moves like she did at 8. The vet check-ins make me feel like we’re doing this properly.
The onboarding was so thorough — real vets, real answers. Pamuk approves of the therapy too.
Sisu was diagnosed with early HCM. Between our cardiologist and the Rapavie vets, we finally feel like we are doing something instead of waiting.
What sold me was the honesty. They were clear that it is a prescription medicine reviewed by a vet, not a supplement. That is exactly why I trust it.
The quarterly lab reviews make me feel like my cat has a whole care team. Being able to message a vet the same day is worth it on its own.
Yuki refuses every tablet ever invented, so the flavoured suspension was the deciding factor. Dosing morning is no longer a wrestling match.