Kidney disease in cats: every treatment compared
Checked against FDA approval records and veterinary references: October 2026
Short answer
Kidney disease in cats cannot be cured, but treatment can keep many cats comfortable for a long time. A kidney diet and good hydration matter most. Medicines then target specific problems: amlodipine or telmisartan for high blood pressure, benazepril or telmisartan for protein in the urine, phosphate binders, and Mirataz, Elura or Cerenia for appetite and nausea. Several are human generics a regular pharmacy can fill.
Kidney disease treatments for cats at a glance
- Kidney dietPrescription renal foodWhat it treats: Slows progression; lower phosphorusHow it is given: Wet or dry food, introduced graduallyWhat to watch for: Cats may refuse it; do not force a sudden switchWhere to get it: Vet, or a retailer with vet authorization
- Fluids under the skinSubcutaneous fluidsWhat it treats: Keeps cats hydratedHow it is given: Given at home, on a schedule your vet setsWhat to watch for: Technique matters; your vet will show youWhere to get it: Vet
- AmlodipineHuman generic tabletWhat it treats: High blood pressureHow it is given: Once a dayWhat to watch for: Blood pressure checksWhere to get it: Regular pharmacy
- Veterinary liquid; human tablets existWhat it treats: High blood pressure; protein loss in urineHow it is given: Once a dayWhat to watch for: Kidney values and blood pressureWhere to get it: Vet, or a regular pharmacy for the human form
- Human generic tabletWhat it treats: Protein loss in urineHow it is given: Once a dayWhat to watch for: Kidney values and potassiumWhere to get it: Regular pharmacy
- Phosphate bindersMixed into foodWhat it treats: Lowers blood phosphorusHow it is given: With each mealWhat to watch for: Constipation; dose by your vetWhere to get it: Vet or over the counter with vet guidance
- Ointment on the ear, or tabletsWhat it treats: Appetite and weightHow it is given: Once a dayWhat to watch for: Vocalizing, restlessnessWhere to get it: Vet; regular pharmacy for human tablets
- Elura (capromorelin)FDA-approved for weight loss in cats with kidney diseaseWhat it treats: Appetite and weightHow it is given: Daily oral liquid, long termWhat to watch for: Drooling, vomitingWhere to get it: Vet
- Veterinary anti-nausea medicineWhat it treats: Nausea and vomitingHow it is given: Once a dayWhat to watch for: Drooling at firstWhere to get it: Vet
- Varenzin-CA1 (molidustat)FDA conditionally approvedWhat it treats: Anemia from kidney diseaseHow it is given: Oral liquidWhat to watch for: Too many red blood cells; not for breeding catsWhere to get it: Vet
| Treatment | What it treats | How it is given | What to watch for | Where to get it |
|---|---|---|---|---|
| Kidney dietPrescription renal food | Slows progression; lower phosphorus | Wet or dry food, introduced gradually | Cats may refuse it; do not force a sudden switch | Vet, or a retailer with vet authorization |
| Fluids under the skinSubcutaneous fluids | Keeps cats hydrated | Given at home, on a schedule your vet sets | Technique matters; your vet will show you | Vet |
| AmlodipineHuman generic tablet | High blood pressure | Once a day | Blood pressure checks | Regular pharmacy |
| Telmisartan (Semintra)Veterinary liquid; human tablets exist | High blood pressure; protein loss in urine | Once a day | Kidney values and blood pressure | Vet, or a regular pharmacy for the human form |
| BenazeprilHuman generic tablet | Protein loss in urine | Once a day | Kidney values and potassium | Regular pharmacy |
| Phosphate bindersMixed into food | Lowers blood phosphorus | With each meal | Constipation; dose by your vet | Vet or over the counter with vet guidance |
| Mirtazapine (Mirataz)Ointment on the ear, or tablets | Appetite and weight | Once a day | Vocalizing, restlessness | Vet; regular pharmacy for human tablets |
| Elura (capromorelin)FDA-approved for weight loss in cats with kidney disease | Appetite and weight | Daily oral liquid, long term | Drooling, vomiting | Vet |
| Maropitant (Cerenia)Veterinary anti-nausea medicine | Nausea and vomiting | Once a day | Drooling at first | Vet |
| Varenzin-CA1 (molidustat)FDA conditionally approved | Anemia from kidney disease | Oral liquid | Too many red blood cells; not for breeding cats | Vet |
Stages and what they mean
Vets stage chronic kidney disease from 1 to 4 using blood tests such as creatinine and SDMA, then substage it by blood pressure and protein in the urine. The stage guides which treatments make sense, and earlier stages often need only diet, hydration and monitoring.
What helps most
A prescription kidney diet is the treatment best shown to help cats with kidney disease live longer, mainly by limiting phosphorus. Switch gradually over a couple of weeks, and if your cat refuses it, ask your vet about other diets or a phosphate binder, because eating something matters more than eating the ideal food.
Hydration comes next: wet food, water fountains and several water bowls help, and many cats benefit from fluids under the skin at home, which most owners learn to give within a few sessions.
Monitoring
Expect blood tests, urine tests and blood pressure checks every few months, more often after a medicine change. High blood pressure can damage the eyes, brain and heart as well as the kidneys, so it is treated even when a cat seems well.
Signs to call your vet about
- Drinking or urinating much more than usual, or a sudden drop in either.
- Not eating for more than a day, weight loss, or vomiting.
- Bad breath, mouth ulcers or drooling.
- Sudden blindness or dilated pupils, which can signal very high blood pressure.
The thyroid connection
Many older cats have both kidney disease and an overactive thyroid. Hyperthyroidism increases blood flow to the kidneys and can hide kidney disease, so kidney values are rechecked once it is treated. See hyperthyroidism in cats.
Medicine safety
Many medicines need lower doses in kidney disease, and anti-inflammatories such as meloxicam carry a boxed warning in cats because repeated use has been linked to kidney failure. Never give a cat human pain relievers, and tell any vet treating your cat that it has kidney disease.
Keeping the cost down
Amlodipine, benazepril and human mirtazapine tablets are inexpensive human generics a regular pharmacy can fill with your vet’s prescription. Fluids, Elura, Mirataz and Varenzin-CA1 come through your vet. See which pet medicines a regular pharmacy can fill.
Frequently asked questions
How long can a cat live with kidney disease?
It varies widely with the stage at diagnosis and how the cat responds to treatment. Many cats diagnosed early live comfortably for years with diet, hydration and treatment of blood pressure and protein loss.
Do I have to give my cat fluids?
Not every cat needs them, especially early on. When a cat is dehydrated or in a later stage, fluids under the skin at home are one of the most helpful treatments, and your vet will teach you how.
Can a regular pharmacy fill my cat’s kidney medicines?
Several, yes: amlodipine, benazepril and human mirtazapine tablets are human generics a regular pharmacy can fill with your vet’s prescription. Veterinary products such as Elura and Mirataz come through your vet.
What is Varenzin-CA1?
It is a conditionally approved FDA medicine for anemia caused by kidney disease in cats. Conditional approval means the FDA found it safe with a reasonable expectation of effectiveness, while full evidence of effectiveness is gathered.