Solensia for Cats: How the New Arthritis Treatment Works
- Solensia is the brand name for frunevetmab, a monthly injection your vet gives to control pain from osteoarthritis in cats.
- It works differently from NSAIDs. Solensia targets nerve growth factor, a key pain-signaling protein involved in feline arthritis pain.
- Some cats show better comfort and mobility within days to weeks, but many need more than one month before the full benefit is clear.
- Common side effects reported in studies included vomiting and injection-site pain. Skin changes, appetite loss, diarrhea, and behavior changes have also been reported.
- A typical 2026 U.S. monthly cost range is about $90-$180 for the injection itself, with exam or technician-visit fees sometimes bringing a visit total closer to $120-$250.
What Is Solensia for Cats?
Solensia is a prescription injectable medication for cats with osteoarthritis pain. Its drug name is frunevetmab, a feline monoclonal antibody that targets nerve growth factor (NGF). NGF plays an important role in pain signaling and pain sensitization in arthritic joints. By binding NGF, Solensia helps reduce the pain messages coming from those joints.
Unlike oral pain medicines that may need daily dosing, Solensia is given under the skin about every 30 days by your vet. It is labeled for control of pain associated with osteoarthritis in cats. The dose is based on body weight, and the product label uses one vial for cats weighing 5.5-15.4 lb (2.5-7 kg) and two vials for cats weighing 15.5-30.8 lb (7.1-14 kg).
This matters because feline arthritis is common and often missed. Many cats do not limp dramatically. Instead, they stop jumping, hesitate on stairs, sleep more, groom less, or seem irritable when touched. Solensia does not cure arthritis or rebuild damaged cartilage, but it can be one option to improve comfort, mobility, and day-to-day quality of life.
Response varies from cat to cat. Some pet parents notice easier jumping or better activity within a few days to weeks. Others need more than one monthly dose before the change is obvious. Your vet may recommend tracking mobility at home so you can judge whether the medication is helping over time.
Symptoms of Solensia for Cats
- Difficulty jumping onto furniture, beds, or windowsills
- Hesitating before stairs or avoiding stairs altogether
- Stiffness after resting or slower movement around the home
- Reduced grooming, especially over the back or hips
- Less play, less climbing, or sleeping more than usual
- Irritability, hiding, or resisting handling over painful joints
- Missing the litter box because stepping into the box is uncomfortable
- Muscle loss over the back legs or a crouched posture
- Vomiting, injection-site pain, or skin changes after a Solensia injection
- Facial swelling, hives, trouble breathing, or collapse after injection
Solensia is a treatment, not a disease, so the main signs pet parents notice are usually arthritis symptoms or possible medication side effects. Cats with osteoarthritis often show subtle behavior changes rather than obvious limping. A cat who no longer jumps to favorite spots may be painful even if they still walk normally.
Call your vet promptly if your cat develops vomiting that keeps happening, marked lethargy, appetite loss, worsening mobility, or new skin irritation after treatment. See your vet immediately if you notice facial swelling, hives, breathing trouble, collapse, or any sudden severe reaction after an injection.
What Causes Solensia for Cats?
Solensia itself does not have a “cause.” It is a medication used to manage pain caused by feline osteoarthritis. Osteoarthritis develops when joint tissues change over time. Cartilage wears down, the joint becomes inflamed, and movement becomes painful. Age-related wear is common, but prior injuries, abnormal joint shape, obesity, and chronic joint instability can also contribute.
In cats, arthritis is often underrecognized because the signs are quiet and gradual. A cat may adapt by doing less, choosing lower resting places, or avoiding activities that hurt. Pet parents may think their cat is “slowing down with age” when pain is actually part of the picture.
Your vet may recommend Solensia when arthritis pain seems to be limiting comfort or mobility and when a monthly injectable option fits the cat and household well. Some cats are not ideal candidates for certain oral pain medicines because of stress with pilling, other health conditions, or the need for a different pain-control strategy. In those cases, Solensia may be one option within a broader arthritis plan.
How Is Solensia for Cats Diagnosed?
Your vet does not diagnose “Solensia.” Your vet diagnoses osteoarthritis pain and then decides whether Solensia is one reasonable treatment option. Diagnosis usually starts with a history of mobility changes at home, followed by a physical and orthopedic exam. Your vet may look for stiffness, reduced joint range of motion, pain on manipulation, muscle loss, or changes in posture and gait.
Radiographs are often used to support the diagnosis, especially when signs are unclear or another orthopedic problem is possible. Still, X-rays do not always match pain perfectly. Some cats with clear arthritis pain have modest radiographic changes, while others with obvious X-ray changes may hide their discomfort well. That is why your observations at home matter so much.
Before starting Solensia, your vet may recommend baseline bloodwork and a urinalysis, especially in older cats or cats with other medical issues. This does not mean Solensia always requires extensive testing, but it helps your vet build a safe, practical treatment plan and monitor for other conditions that can affect mobility, comfort, or medication choices.
After treatment starts, diagnosis becomes an ongoing process of reassessment. Your vet may ask you to track jumping, stair use, grooming, litter box habits, and overall activity over 1-3 months. That follow-up helps determine whether Solensia alone is enough or whether your cat may benefit from weight support, environmental changes, rehabilitation, or another pain-control option.
Treatment Options for Solensia for Cats
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Home mobility changes such as low-entry litter boxes, pet stairs, ramps, and non-slip rugs
- Weight-management plan if your cat is overweight
- Activity modification and easier access to food, water, and favorite resting spots
- Pain tracking at home with videos and a mobility journal
- Discussion with your vet about whether Solensia can be delayed, trialed later, or paired with another lower-cost plan
Recommended Standard Treatment
- Monthly Solensia injection administered by your vet
- Initial exam and arthritis assessment
- Periodic rechecks to judge mobility, comfort, and side effects
- Baseline bloodwork and urinalysis when indicated for age or concurrent disease
- Home modifications and weight support alongside medication
Advanced / Critical Care
- Monthly Solensia plus a multimodal arthritis plan tailored by your vet
- Expanded diagnostics such as radiographs, senior lab work, blood pressure, and urinalysis
- Rehabilitation or physical therapy referral when available
- Careful consideration of additional pain-control options, including selected NSAID use in appropriate cats
- Frequent reassessment for cats with severe pain, multiple painful joints, or complex medical conditions
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Solensia for Cats
Bring these questions to your vet appointment to get the most out of your visit.
- Based on my cat’s exam and history, do you think arthritis pain is the main problem?
- Is Solensia a good fit for my cat’s age, weight, kidney values, and other health conditions?
- How many monthly doses should we try before deciding whether it is helping?
- What changes at home should I track so we can measure response objectively?
- What side effects should make me call right away, and which ones can be monitored at home?
- Would my cat benefit from weight loss, rehab, joint-friendly home changes, or another pain-control option in addition to Solensia?
- What is the expected monthly cost range at your clinic, including injection fees and rechecks?
- If Solensia does not help enough, what are our next conservative, standard, and advanced options?
How to Prevent Solensia for Cats
You do not prevent Solensia. You prevent or slow the arthritis problems that may lead your vet to consider Solensia. The most practical steps are keeping your cat at a lean body condition, encouraging regular low-impact movement, and making the home easier on aging joints. Extra body fat can worsen inflammation and make mobility harder, even when the role of weight in feline arthritis is not as straightforward as it is in dogs.
Good prevention also means noticing small changes early. If your cat stops jumping, hesitates on stairs, grooms less, or becomes less social, bring that up with your vet sooner rather than later. Earlier recognition can open up more treatment options, including environmental support, weight management, and pain-control plans before mobility declines further.
For cats already diagnosed with osteoarthritis, prevention shifts toward preventing flare-ups and loss of function. Use low-entry litter boxes, place food and water on easy-to-reach levels, add traction on slippery floors, and keep nails trimmed so your cat can move more confidently. These steps do not replace medication, but they often make any treatment plan work better.
Regular rechecks matter too. Arthritis is chronic and tends to progress over time. Your vet can help adjust the plan as your cat’s needs change, whether that means continuing Solensia, adding another option, or reassessing if a different approach would fit better.