Solensia for Cats: How It Works, Cost & What to Expect

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Solensia is the brand name for frunevetmab, a prescription injectable monoclonal antibody made specifically for cats. It is FDA-approved to control pain associated with feline osteoarthritis, a common cause of stiffness, reduced jumping, slower movement, and grooming changes in older cats.

Unlike a traditional pain medicine, Solensia targets nerve growth factor (NGF), a pain-signaling protein involved in arthritis discomfort. By binding NGF, the medication helps reduce pain signaling from sore joints. Because it is an antibody rather than a typical NSAID, it is handled differently by the body and may be a useful option for some cats who need a non-daily treatment plan.

Solensia is given as a once-monthly injection under the skin at your vet clinic. Many cats start showing improvement within days to a few weeks, but some need more than one monthly dose before the benefit is clear. Your vet will usually assess response over the first 1 to 3 injections rather than after a single visit.

Solensia is used to control pain associated with osteoarthritis in cats. It is not a cure for arthritis, and it does not rebuild damaged cartilage. Its role is pain control, which can help a cat move more comfortably and return to normal daily behaviors.

Cats with arthritis often show subtle signs instead of obvious limping. Your pet parent observations matter. Your vet may consider Solensia when a cat is no longer jumping to favorite spots, hesitates on stairs, grooms less, seems irritable when handled, sleeps more, or has trouble getting into the litter box.

It is often chosen when daily oral medication is hard to give, when long-term pain control is needed, or when a multimodal arthritis plan is being built. That plan may also include weight management, home changes like ramps or low-entry litter boxes, joint-supportive nutrition, rehabilitation, or other pain medications depending on your cat's overall health.

Solensia is given by subcutaneous injection once every 28 days by a veterinary professional. The labeled dose is 1 to 2.8 mg/kg, and the practical dosing chart used in the prescribing information gives 1 mL to cats weighing 2.5 to 7 kg and 2 mL to cats weighing 7.1 to 14 kg. Cats under 2.5 kg (5.5 lb) should not receive it.

This is not a medication pet parents give at home. Your vet will weigh your cat, confirm that arthritis pain is the likely target, and decide whether the monthly schedule still fits your cat's current needs. If a dose is delayed, the usual approach is to give it as soon as feasible and then continue on the schedule your vet recommends.

Response is not always immediate. Some cats improve after the first injection, while others need 2 to 3 monthly doses before the change is obvious. Your vet may recommend rechecks, mobility questionnaires, or baseline bloodwork and urinalysis, especially in older cats or cats with other medical conditions.

Most cats tolerate Solensia well, but side effects can happen. Reported reactions include pain at the injection site, vomiting, diarrhea, decreased appetite, anxiety, ear infections, and itching, scabbing, or hair loss around the head and neck. Skin changes are worth mentioning early, especially if your cat starts scratching more after an injection.

A mild sore spot after the injection may pass quickly, but ongoing vomiting, poor appetite, marked lethargy, worsening mobility, or new skin lesions deserve a call to your vet. Because many cats receiving Solensia are seniors, it can be hard to tell whether a new sign is from the medication, arthritis progression, or another illness. That is one reason follow-up matters.

Seek urgent veterinary care if you notice signs of a possible allergic reaction such as facial swelling, hives, trouble breathing, collapse, or sudden severe weakness. Solensia should not be used in cats with known hypersensitivity to frunevetmab, and it is not labeled for breeding, pregnant, or nursing cats.

No formal drug interactions have been clearly established for Solensia in cats, but that does not mean interactions are impossible. Your vet should know about every medication and supplement your cat receives, including gabapentin, joint supplements, flea and tick products, steroids, herbal products, and any recent vaccines.

In safety information summarized by VCA, cats in studies received products such as parasiticides, antibiotics, antifungals, antidepressants, antiemetics, corticosteroids, NSAIDs, vaccines, immunotherapy, antihistamines, and other antipruritics without obvious adverse interaction signals. Even so, cats with multiple health problems need individualized review.

Use extra caution if your cat is receiving other monoclonal antibody therapies or if your vet is considering combining Solensia with an NSAID such as meloxicam or robenacoxib. In human anti-NGF research, rapidly progressive osteoarthritis was reported in some patients also receiving NSAIDs, although this has not been reported in cats. That is exactly the kind of decision that should be tailored by your vet to your cat's pain level, kidney status, and overall risk profile.