Horizon Pharma Offers Update on Effectiveness of S-4 Registration

Horizon Pharma, Inc.

today announced that the S-4 registration statement filed by Vidara Therapeutics International Public Limited Company ("Vidara") with the Securities and Exchange Commission on June 26, 2014, as amended on July 28, 2014 and August 6, 2014 regarding the proposed acquisition of Vidara through a reverse merger with Horizon Pharma was declared effective by the SEC on August 7, 2014. The Company also announced that Horizon has scheduled a special meeting of its stockholders on Thursday, September 18, 2014 at 8:00 a.m. Central Time at the Company's headquarters at 520 Lake Cook Road, Suite 520, Deerfield, Illinois. The meeting is being held to seek stockholder approval in connection with the acquisition and related matters. Horizon's stockholders of record as of the close of business on July 30, 2014 are entitled to vote at the meeting. The Company currently expects to complete the acquisition shortly thereafter assuming stockholder approval is obtained, subject to customary closing conditions. Horizon expects to begin mailing a proxy statement/prospectus to stockholders on or about August 11, 2014.