Elanco Announces FDA Approval and Launch of Zenrelia™ (ilunocitinib tablets), Offering An Effective, Safe Solution in Canine Dermatology

Itching is one of the top reasons pet owners bring their dog to the veterinarian, and pet owners and veterinarians want more canine dermatology options. Approximately 17 million dogs suffer from allergic skin disease, including atopic dermatitis, food allergies or flea sensitivity².  Among pet owners who say their dog's itch is not under control, 60% say they've tried treating the itch, but nothing works.³

The approval of Zenrelia represents an important advancement in treating itchy dogs suffering from chronic, acute or seasonal itch and inflammation in a single, once daily tablet from the start. Zenrelia targets itch where it starts by blocking the pathways involved in allergic itch to break the itch-scratch cycle.⁴ Zenrelia offers visible improvement from the first dose and minimizes the risk of "rebound itch" which affects many dogs treated with the competitive JAK inhibitor.^5-10

"Today is a historic day for Elanco with our first of several expected entries into the fast-growing global canine dermatology market, bringing veterinarians and pet owners a highly effective new solution that got more dogs back to normal levels of itch in a head-to-head study with the current JAK inhibitor on the market¹*," said Jeff Simmons, President and CEO, Elanco Animal Health. "We are excited to offer veterinarians and pet owners a solution that can relieve the burdens of itch, while also becoming just the second animal health company to offer veterinarians a comprehensive portfolio, including parasiticides, vaccines, pain and other therapeutics, and now, dermatology."

Promising Results from a Head-to-Head Study¹

Elanco conducted a head-to-head noninferiority study comparing the efficacy and safety of Zenrelia and Apoquel for submission in the European Union. The randomized, double-blind study of 338 client-owned dogs with confirmed atopic dermatitis was conducted across 25 study sites in four countries. The study shows one daily dose of Zenrelia is at least as effective as the market incumbent JAK inhibitor at the primary end point on Day 28. Additionally, there were several promising additional endpoints*:

• Zenrelia provided consistently greater relief from itch and skin lesions over time, with once-daily dosing from the start while rebound itch was observed in Apoquel treated dogs after dosing decreased to once daily after Day 14.
• Zenrelia got more dogs back to normal levels of itch by the end of the study, with 77% of Zenrelia treated dogs achieving clinical remission of itch, compared to 53% of Apoquel treated dogs.
• The difference in treatment response was recognized by owners and veterinarians, with both groups rating Zenrelia higher than Apoquel for overall response to treatment from Day 28 through to Day 112.
• The adverse event profile was similar between the Zenrelia and Apoquel groups.

Veterinarians And Pet Owners Need More Options

Research shows that nearly 70% of veterinarians would be willing to stock another dermatology product² as there are still too many dogs that aren't getting itch relief and many pet owners that would benefit from a more affordable option.  

"We're dedicated to solving these unmet needs in canine dermatology," said Bobby Modi, Executive Vice President, U.S. Pet Health and Global Digital Transformation. "Zenrelia's once-daily dosing is more convenient and will be affordable for pet owners with the launch list price about 20% less for nearly all dogs compared to the current JAK inhibitor. Pet owners will appreciate even greater savings in the first 14 days for Zenrelia given its single vs. twice daily dosing. Very importantly, Zenrelia minimizes the opportunity for rebound itch given its consistent once daily dosing compared to the market incumbent."^{1, 5-10}*

Take for example, Trooper, a one-year-old Yorkshire Terrier who enrolled in the Zenrelia clinical trial. Prior to participating in the clinical trial, Trooper's itch level was 10 out of 10 on the pruritus visual analog scale (PVAS), a validated observation scale for canine itch. By the end of the first two weeks of treatment, he was back to a normal itch level of 1.9 and finished the clinical trial with an itch level of 1.1.** A PVAS score of less than 2 is considered a normal level of itch, also referred to as clinical remission of itch. You can read more about Trooper's story here.

"I was excited to participate as a clinical investigator in the Zenrelia field study because it is clear we need more treatment options for itchy dogs," said Dr. Tom Lewis, veterinarian and founder of Dermatology for Animals, a group of veterinary dermatology clinics committed to caring for pets with allergies. "I saw amazing results during the clinical field study and am eager to get many patients started on Zenrelia. Watching dogs get back to normal quickly and seeing the bond restored between the dog and pet parent was incredibly rewarding."

Demonstrated Safety

The safety of Zenrelia has been demonstrated in multiple toxicity and clinical safety studies. The required margin of safety study for Zenrelia was conducted in healthy dogs dosed with placebo, 1, 2, 3 or 5 times the label dose daily for six months. All dogs completed the study with no serious adverse events.

The Zenrelia label includes a boxed warning on safety related to concurrent vaccine administration based on the results of a vaccine response study. In this study, eight, 10-month-old laboratory beagles received primary vaccinations while being treated with Zenrelia at 3X the label dose. Two dogs were immunosuppressed and euthanized during the study. Antibody responses were evaluated following vaccination. All but one dog responded successfully to modified live vaccines, and two of six dogs responded to inactivated Rabies vaccine at the primary endpoint.

Dogs should be up to date on vaccinations prior to starting Zenrelia. It's important for veterinarians to read the entire package insert, including the Boxed Warning, before prescribing Zenrelia.

"Zenrelia has been demonstrated to be safe and highly effective in a number of studies," said Dr. Mara Tugel, veterinarian and Dermatology Medical Strategic Lead at Elanco. "We recognize that veterinarians need clinically relevant data to guide treatment choices, and plan to pursue additional studies to evaluate vaccine response in Zenrelia-treated dogs. We will continue to work to improve the label over time."

Veterinarians in the U.S. can learn more and place orders for Zenrelia now at Zenreliaforvets.com. Orders are expected to begin shipping in the coming days.

Elanco will conduct a conference call on Friday, September 20, 2024 at 8:00 am eastern time to discuss the Zenrelia approval with the investment community and other interested parties. A live webcast of the conference call can be accessed through the link that will be posted on Elanco's website at https://investor.elanco.com/events-and-presentations/default.aspx. A replay will also be available on the website shortly following the call.

ABOUT ELANCO
Elanco Animal Health Incorporated (NYSE: ELAN) is a global leader in animal health dedicated to innovating and delivering products and services to prevent and treat disease in farm animals and pets, creating value for farmers, pet owners, veterinarians, stakeholders and society as a whole. With nearly 70 years of animal health heritage, we are committed to helping our customers improve the health of animals in their care, while also making a meaningful impact on our local and global communities. At Elanco, we are driven by our vision of Food and Companionship Enriching Life and our Elanco Healthy Purpose™ sustainability pillars – all to advance the health of animals, people, the planet and our enterprise. Learn more at www.elanco.com.

INDICATIONS
is indicated for control of pruritus associated with allergic dermatitis and control of atopic dermatitis in dogs at least 12 months of age.

IMPORTANT SAFETY INFORMATION

Read the entire package insert before using this drug, including the boxed warning. For Full prescribing information call 1 888 545 5973 or visit www.elancolabels.com/us/zenrelia.

WARNING: VACCINE-INDUCED DISEASE AND INADEQUATE IMMUNE RESPONSE TO VACCINES. Based on results of the vaccine response study, dogs receiving Zenrelia are at risk of fatal vaccine-induced disease and inadequate immune response to vaccines. Discontinue Zenrelia for at least 28 days to 3 months prior to vaccination and withhold Zenrelia for at least 28 days after vaccination. Dogs should be up to date on vaccinations prior to starting Zenrelia. Do not use in dogs less than 12 months old or dogs with a serious infection. Monitor dogs for infections because Zenrelia may increase susceptibility to opportunistic infections. Neoplastic conditions (benign and malignant) were observed during clinical studies. Consider the risks and benefits of treatment in dogs with a history of recurrence of these conditions. The most common adverse reactions were vomiting, diarrhea and lethargy. Zenrelia has not been evaluated in breeding, pregnant, or lactating dogs and concurrent use with glucocorticoids, cyclosporine, or other systemic immunosuppressive agents has not been tested. For full prescribing information see package insert. Forward-Looking Statements: TBD

Zenrelia, Elanco and the diagonal bar logo are trademarks of Elanco or its affiliates. Apoquel is a trademark of Zoetis Services, LLC. © 2024 Elanco or its affiliates.

Cautionary Statement Regarding Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the federal securities laws, including, without limitation, statements concerning Zenrelia as a treatment for dogs with allergic dermatitis and timeline for launch, commercial uptake, as well as future studies, publications and other milestones related to Zenrelia, and reflects Elanco's current beliefs and expectations. However, as with any animal health pharmaceutical product, there are substantial risks and uncertainties in the process of drug research, development, and commercialization. Among other things, there is no guarantee that planned or ongoing studies will be completed as planned, that future study results will be consistent with study results to date, that future studies will receive regulatory approval, or that Elanco will execute its strategy as expected. For further discussion of these and other risks and uncertainties that could cause actual results to differ from Elanco's expectations, see Elanco's Form 10-K and Form 10-Q filings with the United States Securities and Exchange Commission. Except as required by law, Elanco undertakes no duty to update forward-looking statements to reflect events after the date of this release.

Investor Contact: Katy Grissom (317) 273-9284 [email protected]
Media Contact: Season Solorio (765) 316-0233 [email protected]   

References:

1. Elanco Animal Health. Data on File.
2. AVMA Sourcebook. Elanco, Dermatology Products SOV Study, 2023
3. Elanco and FleishmanHillard TRUE Global Intelligence Survey.
4. Elanco Animal Health. Data on File.
5. Cosgrove SB, et al. A blinded, randomized, placebo-controlled trial of efficacy and safety of the Janus kinase inhibitor oclacitinib (Apoquel®) in client-owned dogs with atopic dermatitis. Vet Dermatol, 2013; 24: 587-e142.
6. Little PR, et al. A blinded, randomized clinical trial comparing the efficacy and safety of oclacitinib and ciclosporin for the control of atopic dermatitis in client-owned dogs. Vet Dermatol, 2015; 26: 23-e8.
7. Fukuyama T, et al. Demonstration of rebound phenomenon following abrupt withdrawal of the JAK1 inhibitor oclacitinib. European Journal of Pharmacology, 2017; 794: 20-26.
8. Takahashi J, et al. Efficacy and safety of 0.0584% hydrocortisone aceponate topical spray and systemic oclacitinib combination therapy in dogs with atopic dermatitis: a randomized, double-blinded, placebo-controlled trial. Vet Dermatol, 2021; 32: 119-e35.
9. Denti D, et al. Prolonged twice-daily administration of oclacitinib for the control of canine atopic dermatitis: a retrospective study of 53 client-owned atopic dogs. Vet Dermatol, 2022; 33: 149-e42.
10. Olivry T, et al. A randomized controlled trial testing the rebound-preventing benefit of four days of prednisolone during the induction of oclacitinib therapy in dogs with atopic dermatitis. Vet Dermatol, 2023; 34: 99-106.

*Zenrelia was as effective as Apoquel at the primary study endpoint (Day 28). Additional outcomes (P≤0.05) included: proportion of dogs achieving PVAS <2; Mean PVAS and CADESI-4 scores, and veterinary and owner assessments of overall response to treatment. Additional endpoint P values are not adjusted for multiple testing; therefore, caution should be exercised in interpretation.

** Individual results may vary. In the U.S. Allergic Dermatitis and Atopic Dermatitis field studies, the proportion of treated dogs achieving normal itch levels (PVAS <2) after 14 days was 38.4% and 32.8%, respectively.

SOURCE Elanco Animal Health