Horizon Pharma plc Announces the U.S. Patent and Trademark Office Issuance of an Additional Notice of Allowance With Claims Covering VIMOVO(R) (naproxen/esomeprazole) Delayed Release Tablets

DUBLIN, IRELAND–(Marketwired – Jun 1, 2016) – Horizon Pharma plc (NASDAQ: HZNP), a biopharmaceutical company focused on improving patients’ lives by identifying, developing, acquiring and commercializing differentiated and accessible medicines that address unmet medical needs, today announced the issuance of a Notice of Allowance from the United States Patent and Trademark Office (USPTO) for U.S. patent application number 14/980,639, entitled “Method for Delivering a Pharmaceutical Composition to Patient in Need Thereof” that covers the U.S. approved medicine VIMOVO® (naproxen/esomeprazole) delayed release tablets.

This Notice of Allowance concludes the substantive examination of the patent application and will result in the issuance of a U.S. patent after administrative processes are completed. The U.S. patent scheduled to issue from this application will expire September 3, 2029. After issuance, Horizon and a subsidiary of Aralez Pharmaceuticals Inc. (NASDAQ: ARLZ) (TSX: ARZ) plan to list the patent in the FDA’s Approved Drug Products with Therapeutic Equivalence Evaluations, or Orange Book.

About VIMOVO
VIMOVO (naproxen/esomeprazole magnesium) is a fixed-dose combination of delayed-release enteric-coated naproxen, a non-steroidal anti-inflammatory drug (NSAID), and immediate-release esomeprazole magnesium, a stomach acid-reducing proton pump inhibitor (PPI), approved for the relief of signs and symptoms of osteoarthritis, rheumatoid arthritis and ankylosing spondylitis and to decrease the risk of developing gastric ulcers in patients at risk of developing NSAID-associated gastric ulcers. VIMOVO is not recommended for use in children younger than 18 years of age. VIMOVO is not recommended for initial treatment of acute pain because the absorption of naproxen is delayed compared to absorption from other naproxen-containing products. Controlled studies do not extend beyond six months. VIMOVO should be used at the lowest dose and for the shortest amount of time as directed by your health care provider. For Full Prescribing Information please see www.VIMOVO.com.

Important Safety Information

• Nonsteroidal anti-inflammatory drugs (NSAIDs), including naproxen, a component of VIMOVO, may increase the chance of a heart attack or stroke, which can be fatal. This chance increases with longer use and in people who have heart disease or risk factors for heart disease.
• VIMOVO should not be used before or after a type of heart surgery called coronary artery bypass graft (CABG).
• NSAID-containing medications like VIMOVO may increase the chance of stomach and intestinal problems, such as bleeding or an ulcer. These problems can happen without warning and can lead to death. Older patients may have a greater chance of developing these problems.

VIMOVO is not right for everyone, including patients who have had an asthma attack, hives or other allergic reaction with aspirin or any other NSAID medicine, patients who are allergic to any of the ingredients in VIMOVO or women in late stages of pregnancy.

Serious allergic reactions, including skin reactions, can occur without warning and can be life-threatening; discontinue use of VIMOVO at the first appearance of a skin rash or if you develop sudden wheezing; swelling of the lips, tongue or throat; fainting or problems swallowing.

VIMOVO should be used at the lowest dose and for the shortest amount of time as directed by your health care provider.

Tell your health care provider right away if you develop signs of active bleeding from any source.

VIMOVO can lead to onset of new hypertension or worsening of existing high blood pressure, either of which may contribute to an increased risk of a heart attack or stroke.

Speak with your health care provider before starting VIMOVO if you

• Have a history of ulcers or bleeding in the stomach or intestines
• Have heart problems, high blood pressure, or are taking high blood pressure medications
• Have kidney or liver problems

Tell your doctor about all of the medicines you take, prescription and non-prescription drugs, including clopidogrel, vitamins and herbal supplements. VIMOVO may affect how other medicines work and other medicines may affect how VIMOVO works.

VIMOVO may increase your risk of getting severe diarrhea. Call your doctor right away if you have watery stool, stomach pain and fever that does not go away.

Talk to your health care provider about your risk for bone fractures and developing low levels of magnesium if you take VIMOVO for a long period of time.

Talk to your health care provider about your risk for developing low levels of magnesium if you take VIMOVO for a long period of time.

The most common side effects of VIMOVO include: inflammation of the lining of the stomach, indigestion, diarrhea, stomach ulcers, abdominal pain and nausea.

For more information on VIMOVO, please see the Medication Guide and Full Prescribing Information.

About Horizon Pharma plc
Horizon Pharma plc is a biopharmaceutical company focused on improving patients’ lives by identifying, developing, acquiring and commercializing differentiated and accessible medicines that address unmet medical needs. The Company markets nine medicines through its orphan, rheumatology and primary care business units. Horizon’s global headquarters are in Dublin, Ireland. For more information, please visit www.horizonpharma.com. Follow @HZNPplc on Twitter or view careers on our LinkedIn page.

Forward-Looking Statements
This press release contains forward-looking statements, including statements regarding the issuance of a patent based on the Notice of Allowance from the U.S. Patent and Trademark Office, the expected term of the patent, if issued, potential patent protection for VIMOVO and plans to list any newly issued patent in the FDA’s Orange Book. These forward-looking statements are based on management expectations and assumptions as of the date of this press release, and actual results may differ materially from those in these forward-looking statements as a result of various factors. These factors include risks regarding whether the administrative processes required for the issuance of a patent as indicated in the Notice of Allowance will be completed in a timely matter or at all, whether the patent, if issued as indicated in the Notice of Allowance, will provide sufficient protection and market exclusivity for VIMOVO, whether any patents covering VIMOVO may be challenged, invalidated, infringed or circumvented by third parties and other factors described in Horizon’s filings with the United States Securities and Exchange Commission, including those factors discussed under the caption “Risk Factors” in those filings. Forward-looking statements speak only as of the date of this press release and Horizon does not undertake any obligation to update or revise these statements, except as may be required by law.