We currently have several ongoing clinical trials for the development of our novel, non-opioid chronic pain therapeutics.

If you are interested in participating in one of our clinical trials, please talk to your doctor or visit clinicaltrials.gov for more information on our studies and inclusion criteria.

Osteoarthritis (Human and Canine)

Osteoarthritis (OA) is the most common form of arthritis, affecting tens of millions of people worldwide. The chronic pain associated with OA, in particular the severe pain experienced by nearly a quarter of OA sufferers, is one of the most common reasons for chronic opioid prescriptions. OA occurs when the protective cartilage on the ends of the bones wears down over time, and the bone around the joints hardens and form edges. These changes cause pain, swelling and problems moving the joint. An inflammatory process occurs, and cytokines (proteins) and enzymes develop that further damage the cartilage. Although it can damage the majority of joints in the body, the disorder most commonly affects joints in hands, knees, hips and spine. OA can cause pain severe enough that patients experience difficulty with simple daily movements such walking, climbing stairs or even rising from a chair. Despite currently available therapies, many patients still suffer with chronic moderate to severe pain. For some, there is the option for total joint replacement to manage the painful condition. But for many, surgery is not an option due to age, or other conditions, such as lack of adequate support and long recovery periods.

OA also affects pets – in particular, dogs – in a very similar way to humans. Current treatment options are designed to control signs and symptoms of the disease, not to cure it. As such, for many dogs with unmanageable OA pain, the only choice owners have is to euthanizing their pet in order to end its suffering.

The previous COAST trial, which investigated CNTX-4975 for the treatment of osteoarthritis in pet dogs, identified a dose for future pivotal studies. The STEPS trial is underway as a double-blind, placebo-controlled, parallel group, single injection study to confirm the dose and refine study design before starting the pivotal efficacy trial. The STEPS trial is currently enrolling pet dogs at sites in San Diego, Minneapolis, Philadelphia and Appleton, Wisconsin. If you are interested in enrolling in the trial or would like additional information about inclusion criteria, please talk to your veterinarian or reach out to info@centrexion.com.


This placebo-controlled Phase 2b trial in patients with knee OA has completed enrollment and is no longer recruiting patients.


Double-blind, placebo-controlled trial in canines with osteoarthritis.

Morton’s Neuroma

Morton’s neuroma involves a thickening of the tissue around one of the nerves leading to the toes. This can cause a sharp, burning pain in the foot and the toes also may sting, burn or feel numb. Repetitive strain on the front of the foot such as wearing of high heeled shoes or long-distance running have been linked to the development of Morton's neuroma. Some people experience relief by switching to lower heeled shoes with wider toe boxes or by using orthotics. For those not responding to this, the current standard of care is to use corticosteroid injections. If these fail, the only option is surgery to remove the nerve containing the neuroma, however, the area where the nerve has been removed is left permanently without feeling 1.

There are currently no FDA approved treatments for Morton's neuroma. The FDA has granted CNTX-4975 Orphan Drug and Fast Track designations for the treatment of Morton's neuroma pain.


This Phase 2 double-blind, placebo-controlled trial in patients with Morton’s neuroma has completed enrollment and is no longer recruiting patients.

For more information, visit clinicaltrials.gov.