Adequan Canine is an FDA-approved injectable drug that slows the progression of arthritis in dogs by protecting joint cartilage from further breakdown. Unlike over-the-counter joint supplements, it’s a regulated pharmaceutical that requires a veterinary prescription and is given as a series of intramuscular injections. It’s one of the few treatments for canine osteoarthritis that works at the disease level rather than simply masking pain.
How Adequan Works in the Joint
The active ingredient in Adequan is polysulfated glycosaminoglycan, or PSGAG, a semi-synthetic compound extracted from bovine tracheal cartilage. It works on two fronts inside the joint. First, it inhibits the enzymes responsible for breaking down cartilage, which slows the destructive cycle of osteoarthritis. Second, it promotes the production of key building blocks that joints need to stay healthy: collagen, proteoglycans, and hyaluronic acid. Hyaluronic acid is especially important because it’s a major component of synovial fluid, the slippery lubricant that allows joint surfaces to glide smoothly against each other.
Lab studies on cartilage cells have confirmed that PSGAG stimulates increased production of proteoglycans and hyaluronic acid. It also has a specific effect on synovial membrane cells, the tissue lining the joint capsule, boosting their ability to produce that lubricating fluid. The net result is less cartilage destruction and a better environment inside the joint for whatever healthy cartilage remains.
What Conditions It Treats
Adequan is FDA-approved for the control of signs associated with non-infectious degenerative and traumatic arthritis in canine synovial joints. In plain terms, that covers osteoarthritis (the wear-and-tear kind) and joint damage from injuries. The clinical studies that supported its approval evaluated hips, stifles (knees), shoulders, hocks (ankles), and elbows. It is not intended for joint problems caused by infection.
Dogs most commonly receive Adequan for hip dysplasia-related arthritis, cruciate ligament disease, elbow dysplasia, and general age-related joint degeneration. Some veterinarians also prescribe it after joint surgery to support cartilage recovery during healing.
Dosage and Injection Schedule
The standard protocol is 2 mg per pound of body weight, given by intramuscular injection twice a week for up to four weeks. That’s a maximum of eight injections in the initial course. For a 50-pound dog, each injection is 1 mL. The label specifically states not to exceed this dose or schedule.
Many veterinarians teach owners to give the injections at home after demonstrating proper technique. If you’re administering it yourself, the key requirements are using a sterile needle for every injection (never reuse needles), cleaning the vial’s rubber stopper with alcohol before each draw, and injecting into muscle tissue rather than under the skin. The vial can be punctured a maximum of 10 times and must be used within 28 days of the first puncture. Store it at room temperature and keep it away from heat above 104°F.
The FDA-approved label does not include a maintenance protocol beyond the initial eight injections. In practice, many veterinarians prescribe ongoing injections at longer intervals (often monthly) after the loading phase, but this is off-label and varies by clinic and by how well the dog responds.
How It Differs From Joint Supplements
This is a distinction worth understanding clearly. Oral joint supplements containing glucosamine and chondroitin are classified as nutraceuticals. They are not closely regulated by the FDA, cannot legally claim to treat or cure disease, and have significant gaps in their evidence base. A review from Auburn University’s College of Veterinary Medicine noted that the potential benefits of glucosamine and chondroitin in arthritic dogs “can neither be confirmed nor denied” based on available research. The evidence is further muddied by inconsistencies in product quality, varying formulations, and a lack of proper dose studies.
Adequan, by contrast, is an FDA-licensed drug. It went through a formal approval process with clinical trials demonstrating that it inhibits the enzymes responsible for cartilage breakdown. That doesn’t mean oral supplements are worthless for every dog, but it does mean the level of evidence behind Adequan is in a different category entirely. If your veterinarian recommends both, they serve different roles: Adequan as a proven pharmaceutical intervention and supplements as a lower-cost, lower-evidence addition.
Safety and Risks
Adequan is generally well tolerated. The most commonly reported issues are mild and related to the injection itself, such as brief discomfort or soreness at the injection site. Some dogs may experience mild gastrointestinal upset.
One important consideration is that PSGAG has mild blood-thinning (heparinoid) properties. This means it may not be appropriate for dogs with known bleeding disorders or those about to undergo surgery. If your dog is on other medications that affect clotting, your vet will weigh the risks. The drug should also not be mixed with other drugs or solvents in the same syringe.
When to Expect Results
There is no single published timeline for when owners will notice improvement, and individual responses vary considerably. Some dogs show improved mobility and comfort within the first few injections, while others don’t show obvious changes until the full course is complete. Because Adequan works by slowing cartilage destruction and supporting the joint environment rather than by blocking pain signals directly, its benefits can be subtler and more gradual than what you’d see with a pain reliever. Many dogs receive Adequan alongside anti-inflammatory medications, which can make it harder to isolate exactly which treatment is doing the heavy lifting for pain relief in the short term.
The more meaningful benefit is long-term: less cartilage loss over time means the joint deteriorates more slowly, which can translate into better mobility and quality of life months and years down the road. For dogs in the earlier stages of arthritis, starting treatment sooner gives the drug more healthy cartilage to protect.
What the Treatment Looks Like in Practice
A typical experience starts with your vet diagnosing osteoarthritis through a combination of physical exam, history, and often X-rays. If Adequan is recommended, you’ll either bring your dog in twice a week for four weeks or learn to give the injections at home. Home administration is common because the twice-weekly schedule makes frequent vet visits impractical and expensive for many owners. The injections use a relatively small needle and go into the large muscles of the hind leg or hip area. Most dogs tolerate them well, especially once they’ve had a few.
After the initial eight-injection course, your vet will reassess your dog’s comfort and mobility. If the response is positive, they may recommend periodic maintenance injections to sustain the benefits. The cost varies by clinic and dog size but typically runs between $20 and $50 per injection, with the initial course totaling a few hundred dollars before any maintenance phase. Multi-dose vials help keep costs down for larger dogs or multi-dog households, though the 28-day and 10-puncture limits mean you can’t stockpile a single vial indefinitely.