Capromorelin in Cats

Capromorelin is a prescription appetite stimulant used in cats. In the United States, the feline product is sold as Elura, an oral solution approved by the FDA for management of weight loss in cats with chronic kidney disease, often called CKD. It is not a cure for kidney disease, and it does not replace a full workup for weight loss. Instead, it is one tool your vet may use when a cat with CKD is eating poorly, losing muscle, or struggling to maintain body weight.

This matters because weight loss in cats is rarely a small issue. Older cats with kidney disease often lose weight before the diagnosis is even made, and ongoing weight loss can affect strength, comfort, and day-to-day quality of life. In the FDA field study used for approval, cats receiving capromorelin gained weight over the study period, while control cats lost weight overall. That makes capromorelin a practical option for some pet parents, especially when poor appetite is part of a larger CKD care plan.

Capromorelin is usually considered after your vet has looked for other reasons a cat is not eating well. Nausea, dehydration, dental pain, constipation, high blood pressure, hyperthyroidism, and progression of kidney disease can all affect appetite. If those issues are present, they often need attention too. Appetite stimulants work best when they are part of a broader plan rather than the only step.

Because this medication can affect blood sugar, heart rate, blood pressure, and behavior, it is not right for every cat. Your vet may recommend it, avoid it, or use it with extra monitoring depending on your cat’s kidney values, hydration, heart status, liver function, and history of diabetes or acromegaly.

Capromorelin is a ghrelin receptor agonist. Ghrelin is a natural hormone involved in hunger signaling, food intake, and metabolism. By mimicking ghrelin, capromorelin helps stimulate appetite and can also support weight gain through metabolic effects. In plain language, it helps tell the body and brain that it is time to eat, and it may do more than increase interest in food alone.

That mechanism is one reason capromorelin is different from some other appetite medications used in cats. Mirtazapine, for example, works through different neurotransmitter pathways. Capromorelin acts on the ghrelin pathway instead, which is why your vet may choose one medication over another based on your cat’s medical history, side effect risk, and how easy the medication is to give.

In the FDA approval data for Elura, the selected dose was 2 mg/kg by mouth once daily. In the pivotal field study, cats with CKD receiving capromorelin had a statistically significant increase in body weight by day 55 compared with control cats. The label reports an average gain of 5.2% in the Elura group versus a 1.6% loss in the control group. That does not mean every cat responds the same way, but it does show that the drug can help many cats maintain or regain weight.

Even so, capromorelin does not fix the reason a cat stopped eating. If nausea, mouth pain, constipation, pancreatitis, or worsening kidney disease are driving the appetite loss, those problems still need attention. Your vet may pair capromorelin with diet changes, anti-nausea medication, fluids, dental care, or other CKD treatments depending on the situation.

The most common side effects reported with Elura in cats include vomiting, hypersalivation, inappetence, behavior change, lethargy, diarrhea, dehydration, and hyperglycemia. In the field study on the FDA label, vomiting occurred in about 29.6% of treated cats and hypersalivation in 21.2%. Hypersalivation was generally linked to dosing and usually resolved within a few minutes. Some cats also showed hiding, unusual behavior, vocalization, weakness, or trouble tolerating the medication.

Capromorelin also has some important cautions. The label says not to use it in cats with hypersomatotropism, also called acromegaly. It may raise blood glucose for several hours after dosing, so use in cats with current or past diabetes mellitus has not been evaluated and may not be appropriate. Your vet should also use caution in cats with cardiac disease, severe dehydration, or liver dysfunction. The medication can cause temporary decreases in heart rate and blood pressure for up to about four hours after a dose.

Most side effects are not emergencies, but some deserve a same-day call to your vet. Contact your vet promptly if your cat becomes very weak, collapses, seems unusually sedated, breathes hard, stops eating completely, vomits repeatedly, or seems worse after starting the medication. If your cat is hard to wake, has trouble breathing, or collapses, see your vet immediately.

It is also worth remembering that cats taking capromorelin often already have CKD and other health issues. That can make it harder to tell whether a new problem is from the medication, the underlying disease, or both. Careful monitoring of appetite, body weight, water intake, energy level, and lab work helps your vet decide whether to continue, adjust, or stop treatment.

For the FDA-approved feline product Elura, the labeled dose is 2 mg/kg by mouth once daily, which equals 0.1 mL/kg of the 20 mg/mL oral solution. It should be given using the dosing syringe provided with the bottle. Because this is a prescription medication, your vet should calculate the dose for your cat and show you how to measure it correctly.

The label instructs pet parents to give the medication directly into the mouth. If your cat is routinely fed meals, food can be offered 30 minutes after dosing. If vomiting happens within 15 minutes or only part of the dose was received, the label says the dose may be re-administered. After use, the syringe and plunger should be rinsed with water and left apart to dry.

Consistency matters. Giving the medication at about the same time each day makes it easier to judge whether it is helping and whether any side effects follow dosing. Your vet may also want regular rechecks for body weight, body condition, muscle condition, hydration, kidney values, and sometimes blood glucose. That is especially important in older cats and in cats with multiple medical problems.

Do not change the dose, stop the medication, or combine it with other appetite stimulants unless your vet tells you to. Some cats do well on capromorelin alone. Others need a different plan, such as anti-nausea medication, fluids, diet changes, or a switch to another appetite support option if side effects outweigh the benefit.

There are no widely published, label-listed drug interactions for capromorelin in cats in the way you might see with some human medications. Still, that does not mean interactions are impossible. Cats taking Elura often have CKD and may also be on anti-nausea drugs, blood pressure medication, phosphate binders, potassium supplements, thyroid medication, pain control, or subcutaneous fluids. Your vet needs the full medication and supplement list to judge the safest combination.

The biggest practical concerns are not always classic drug-drug interactions. They are overlapping effects. For example, if a cat is prone to dehydration, low blood pressure, weakness, or blood sugar problems, adding capromorelin may complicate the picture. The FDA cat information page specifically notes caution in cats with heart disease, severe dehydration, liver disease, diabetes history, or acromegaly.

It is also important to tell your vet if your cat is receiving another appetite stimulant such as mirtazapine, or if nausea is being treated with medications like maropitant or ondansetron. In some cases, combination therapy may make sense. In others, your vet may prefer to start one change at a time so it is easier to tell what is helping and what is causing side effects.

Do not start over-the-counter supplements, CBD products, or compounded appetite medications without checking first. Evidence for some alternatives is limited, and CKD cats can be sensitive to even small changes. A careful medication review is one of the safest ways to build a plan that fits your cat’s needs and your household routine.