RAPAMYCIN FOR CATS — Longevity For Your Cat
Rapamycin for Cats: Veterinary-Guided Feline Longevity Therapy
Dr. Kevin has treated more than 300 HCM cats with Felycin and compounded rapamycin -- more than any other veterinarian in the US. Here is what he has learned.
The Cat You Love Is Still In There.
Cats hide their aging well. But you know your cat — and you've noticed. The slower mornings. The window perch they don't jump to anymore. The quietness that wasn't there before.
Your cat is still in there. The purr at 2am. The specific weight of them settling onto your legs. The way they find you when you're having a hard day, as though they always know.
That relationship is worth protecting with the best medicine available.
Not hope. Not waiting. Medicine, once weekly.
Prescribed by a veterinarian who has spent 40 years making sure cats like yours get more time than anyone thought possible.
What is Rapamycin for Cats?
Rapamycin, also called sirolimus, is a prescription medication that acts on aging, inflammation, and cell growth. Helping Pets Live Longer offers rapamycin for cats as delayed-release tablets or compounded liquid medication. Before prescribing it, Dr. Kevin reviews your cat’s health, current medications, treatment goals, and monitoring needs.
Looking Specifically for Felycin-CA1? Here you go.
Dr. Kevin has treated more than 300 HCM cats with Felycin and compounded rapamycin -- more than any other veterinarian in the US. Here is what he has learned.
Rapamycin for Feline Longevity.
Rapamycin has been shown to improve immune function, reduce inflammation, and support cellular health that helps your cat thrive.
Most feline medicine is reactive. Rapamycin offers a proactive pathway for your cat.
But here's what matters most: Dr. Kevin can prescribe it for your cat today. Because waiting for HCM, kidney disease, or cancer is not a strategy.
One of Dr. Kevin's patients — a cat named Jack — arrived nearly in crisis, breathing hard enough to need an oxygen chamber. His family found HPLL when their local vet had run out of options. Jack has been on rapamycin for almost a year now. He's home. He's comfortable. He's still there. That's not luck. That's what happens when the right medicine reaches a cat that still has time left. The question is never whether rapamycin works. The question is whether you start before the window closes — or after.
4 Ways That Rapamycin Protects Your Cat
In cats, at precisely calibrated weekly doses, rapamycin targets the four greatest threats to feline longevity:
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What the Research Shows in Cats: ✓ HEART DISEASE — Rapamycin may slow or stop the progression of hypertrophic cardiomyopathy — the #1 killer of adult cats over age 9. Nothing else has ever done this. ✓ CHRONIC KIDNEY DISEASE (CKD) — Rapamycin has been shown to slow CKD progression in multiple mammalian species. Active clinical trials at Ohio State, Florida, and Texas veterinary schools are studying this directly in cats. ✓ CANCER RISK — Rapamycin has been proven beneficial in feline mammary cancer and squamous cell carcinoma. It works by helping the immune system identify and destroy abnormal cells before they establish. ✓ WHOLE-BODY AGING — By targeting mTOR, rapamycin addresses the core biology of cellular aging itself — reducing the systemic inflammation, cellular dysfunction, and metabolic decline that makes cats age faster than they should. |
What Cat Parents Are Saying.
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"Our kitty has been on rapamycin since December and is NOTICEABLY more active, energetic, and playful. Working with Dr. Kevin has been the best investment in our little bud's happiness — and ours."
— Verified Buyer, Early HCM Cat
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"I was terrified our HCM kitty Patch didn't have much time left. After working with Dr. Kevin and starting Rapamycin, Patch is his old spunky self again."
— Patch's Mom
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"My 12-year-old cat Leo was diagnosed with HCM 4 months ago. Dr. Kevin gave me confidence to try rapamycin. He is now breathing much better — and his arthritis improved too. 6 weeks on rapamycin."
— Leo's Owner
Is Rapamycin Right For Your Cat?
Rapamycin is not reserved for cats already in crisis. It works best — and does its greatest good — when started before symptoms steal the time you have left.
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Rapamycin Is the Right Choice If Your Cat: ✓ Is 6 or older — the age range where HCM, CKD, and cancer risks begin accelerating ✓ Has been diagnosed with HCM, even in early or subclinical stages ✓ Has early kidney changes showing on bloodwork (elevated SDMA, BUN, creatinine trends) ✓ Has chronic inflammation, dental disease, or a history of infection ✓ Is a breed with elevated HCM risk: Maine Coon, Ragdoll, British Shorthair, Persian, Sphynx ✓ Has been diagnosed with cancer — particularly mammary tumors or squamous cell carcinoma ✓ Is currently healthy but belongs to a parent who refuses to wait for the first symptom |
Veterinary Monitoring for Cats Taking Rapamycin
Dr. Kevin has treated more than 300 HCM cats with Felycin and compounded rapamycin -- more than any other veterinarian in the US. Here is what he has learned.
At Helping Pets Live Longer, rapamycin for cats is prescribed within a structured longevity strategy — not handed over and forgotten. Dr. Kevin reviews your cat's heart, kidney, and metabolic health before prescribing. He calibrates the dose to your cat's exact weight. He monitors their response and adjusts over time.
Dosing matters. Timing matters. Monitoring matters. Used correctly, rapamycin can protect years of healthy life. Used without guidance, it may create unnecessary risk.
This structure is what makes longevity medicine responsible — and effective for your cat.
How to Obtain Prescription Rapamycin for Cats
Rapamycin for your cat requires a valid veterinary prescription. You have two simple ways to get started:
1. Use your current veterinarian
Ask your vet to email us a prescription at HelpingPetsLiveLonger@gmail.com. We’ll take care of the rest.
2. Work directly with Dr. Kevin --Enroll in the Cat Longevity Protocol
Dr. Kevin will review your cat's health and create a clear, science-based plan—including the right tests, supplements, diet, and medications to extend both lifespan and quality of life. Backed by 40 years of clinical experience and modern longevity science.
Longevity is not about access. It’s about judgment. That difference matters.
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Important Safety Notes: ✓ Rapamycin is a prescription drug — requires valid veterinary Rx or active HPLL strategy session to order ✓ Not recommended in diabetic cats without veterinary oversight ✓ Rapamycin is degraded by stomach acid — only acid-resistant formulations like HPLL's deliver a therapeutic dose ✓ Beware overseas sources — concentration and purity cannot be verified; trace contaminants have been found by independent labs |
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Rapamycin For Cats -- Frequently Asked Questions.
Where can I get prescription rapamycin for my cat?
Helping Pets Live Longer provides veterinarian-prescribed compounded rapamycin for eligible cats. Your veterinarian can submit a prescription, or Dr. Kevin can evaluate your cat through an appropriate veterinary consultation. Delayed-release tablets and compounded oral-liquid formulations are available.
Should my cat get Felycin-CA1 or Rapamycin?
Felycin-CA1 may be the more directly aligned choice for a cat meeting its labeled subclinical-HCM criteria. Compounded rapamycin may be considered when individualized strength, liquid administration or another veterinarian-directed treatment goal is needed. The choice should be based on your cat's diagnosis, stage, formulation needs and medical history.
My cat seems absolutely healthy. Should I still start rapamycin?
This is exactly when to start. Prevention is ALWAYS more effective than treatment.
How is rapamycin given to cats?
One dose, once weekly, given with food. The tablets are small, or you can use our flavored liquid rapamycin. The once-weekly dosing makes compliance manageable even for the most stubborn cats.
Will rapamycin interact with my cat's other medications?
All drug interactions are reviewed during your Longevity Strategy Session or when your vet submits a prescription. Certain cardiac medications and supplements require evaluation. This is part of why active veterinary oversight is built into every HPLL rapamycin prescription.
Medically reviewed by Kevin Toman, DVM | Last reviewed August 2026
Want to talk with Dr. Kevin about getting your best pal started on RAPAMYCIN? Email him at DrKevin@TheLongevityVet.com, or call him at (805) 660-3759.
