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Horizon Pharma Announces the U.S. Patent and Trademark Office Issued an Additional Notice of Allowance With Claims Covering


Horizon Pharma Announces the U.S. Patent and Trademark Office Issued an Additional Notice of Allowance With Claims Covering RAYOS(R) (Prednisone) Delayed-Release Tablets

DEERFIELD, IL -- (Marketwire) -- 02/06/13 -- Horizon Pharma, Inc. (NASDAQ: HZNP) today announced that Skyepharma has received a Notice of Allowance from the United States Patent and Trademark Office (USPTO) for U.S. Patent Application 13/428,548 entitled "Delayed Release Tablet with Defined Core Geometry" that covers the Company's U.S. approved product RAYOS(R).

"This action by the USPTO is another important milestone in expanding the RAYOS patent estate and demonstrates once again our ongoing commitment, in partnership with Skyepharma, to protect the innovation and commercial potential of RAYOS," stated Timothy P. Walbert, chairman, president and chief executive officer, Horizon Pharma.

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 in 2024. After issuance, Horizon plans to list the U.S. patent in the FDA's Approved Drug Products with Therapeutic Equivalence Evaluations, or Orange Book. This will be the third U.S. patent to be listed in the Orange Book for RAYOS.

About RAYOS RAYOS, known as LODOTRA(R) in Europe, is a proprietary delayed-release formulation of low-dose prednisone. The pharmacokinetic profile of RAYOS is different with an approximately four-hour lag time from that of immediate-release prednisone formulations. In clinical trials studying use of RAYOS in rheumatoid arthritis (RA), patients were administered RAYOS at 10 p.m. with food. The delayed-release profile of RAYOS helps to achieve therapeutic prednisone blood levels at a time point when cytokine levels start rising during the middle of the night. While the pharmacokinetic profile of RAYOS differs in terms of lag time from immediate-release prednisone, its absorption, distribution and elimination processes are comparable. For more information, please visit www.RAYOSrx.com.

RAYOS utilizes Skyepharma's proprietary Geoclock(TM) technology.

Outside the United States, LODOTRA is approved for the treatment of mo derate to severe active RA when accompanied by morning stiffness in 19 countries. Horizon has granted commercialization rights for LODOTRA in Europe, Asia (excluding Japan) and Latin America to its distribution partner Mundipharma International Corporation Limited. Horizon has an exclusive license from Skyepharma for RAYOS/LODOTRA.

Important Safety Information

RAYOS(R) (prednisone) delayed-release tablets

Approved uses of RAYOS RAYOS, a delayed-release form of prednisone, prevents the release of substances in the body that cause inflammation. RAYOS is approved to treat a broad range of diseases including RA, polymyalgia rheumatica (PMR), psoriatic arthritis (PsA), ankylosing spondylitis (AS), asthma and chronic obstructive pulmonary disease (COPD). For a full list of RAYOS indications, please see full prescribing information at www.RAYOSrx.com.

RAYOS is contraindicated in patients who have known hypersensitivity to prednisone or to any of the excipients. Rare instances of anaphylaxis have occurred in patients receiving corticosteroids.

Important information about RAYOS Do not use RAYOS if you are allergic to prednisone.

Long-term use of RAYOS can affect how your body responds to stress. Symptoms can include weight gain, severe fatigue, weak muscles and high blood sugar.

RAYOS can weaken your immune system, making it easier for you to get an infection or worsening an infection you already have or have recently had.

RAYOS can cause high blood pressure, salt and water retention and low blood potassium.

There is an increased risk of developing holes in the stomach or intestines if you have certain stomach and intestinal disorders.

Behavior and mood changes can occur, including intense excitement or happiness, sleeplessness, mood swings, personality changes or severe depression.

Long-term use of RAYOS can cause decreases in bone density.

RAYOS can cause cataracts, eye infections and glaucoma.

Do not receive a "live" vaccine while taking RAYOS. The vaccine may not work as well during this time and may not fully protect you from disease.

Taking RAYOS during the first trimester of pregnancy can harm an unborn baby.

Long-term use of RAYOS can slow growth and development in children.

The most common side effects with RAYOS are water retention, high blood sugar, high blood pressure, unusual behavior and mood changes, increased appetite and weight gain.

Please see full prescribing information for RAYOS at www.RAYOSrx.com.

About Horizon Pharma Horizon Pharma, Inc. is a specialty pharmaceutical company that has developed and is commercializing DUEXIS and RAYOS/LODOTRA, both of which target unmet therapeutic needs in arthritis, pain and inflammatory diseases. The Company's strategy is to develop, acquire, in-license and/or co-promote additional innovative medicines where it can execute a targeted commercial approach in specific therapeutic areas while taking advantage of its commercial strengths and the infrastructure the Company has put in place.

About Skyepharma PLC Skyepharma uses its multiple drug delivery technologies and expertise to create pharmaceutical products. The Group receives revenues from 13 approved products in the areas of inhalation, oral, topical and injectable delivery as well as generating income from the development of further products and technology licenses. The Group's products are marketed throughout the world by leading pharmaceutical companies. For more information, visit www.Skyepharma.com.

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 and the ability to protect the innovation and commercial potential of RAYOS. These forward-looking statements are based o n management's 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 RAYOS, whether any patents issued to Horizon 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 undertakes no obligation to update or revise these statements, except as may be required by law.

Contacts Robert J. De Vaere Executive Vice President, Chief Financial Officer investor-relations@horizonpharma.com

Investors Kathy Galante Burns McClellan, Inc. kgalante@burnsmc.com 212-213-0006

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