Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-1 of our report dated March 23, 2012 relating to the financial statements, which appears in Horizon Pharma’s Annual Report on Form 10-K for the year ended December 31, 2011. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ PricewaterhouseCoopers LLP

Chicago, Illinois

April 6, 2012