Sirolimus (Rapamune® / Rapamycin) – Advanced Support for Feline Hypertrophic Cardiomyopathy (HCM)

Advanced Cardiac Support for Cats with Hypertrophic Cardiomyopathy (HCM)

A diagnosis of feline HCM can feel overwhelming. The heart walls thicken silently, and conventional treatments often only manage symptoms. Sirolimus (Rapamune® / Rapamycin) is an mTOR inhibitor with growing evidence in veterinary cardiology for its ability to slow the pathological processes driving HCM — offering a proactive approach to protecting your cat's heart.

How Sirolimus Works

Sirolimus selectively inhibits the mammalian target of Rapamycin (mTOR) pathway — a key regulator of cellular growth and cardiac remodeling. In feline HCM, dysregulation of this pathway contributes to abnormal thickening of the ventricular walls. By modulating mTOR activity, Sirolimus may help:

• Slow pathological myocardial hypertrophy — reducing abnormal thickening of the heart muscle
• Reduce cardiac fibrosis — limiting the scarring that stiffens the heart and impairs function
• Modulate cellular proliferation — targeting the root biological drivers of HCM progression
• Support cardiac remodeling — helping preserve healthier heart structure over time

Why Choose Sirolimus for Feline HCM?

• mTOR-targeted mechanism — addresses the underlying pathway implicated in HCM, not just the symptoms
• Studied in veterinary cardiology — supported by emerging research into feline cardiac disease management
• Conditional FDA-approved compound — Rapamycin (Sirolimus) has an established pharmacological profile
• Flexible dosing — available in 1.2 mg and 2.4 mg to allow precise, vet-guided dosing

Available Strengths

• 1.2 mg × 10 tablets — for lower-dose protocols
• 2.4 mg × 10 tablets — for higher-dose veterinary protocols

Important Information

Sirolimus must be used strictly under veterinary supervision. Dosing, monitoring, and duration of treatment should be determined by a qualified veterinarian experienced in feline cardiology. Regular blood work and cardiac monitoring are recommended during treatment.