Sixty new jobs are on the way to Dublin over the next three years.
Taoiseach Enda Kenny made the announcement at the official opening of Horizon Pharma's new global HQ at Burlington Road in Dublin 4.
The new jobs will be in areas such as Research and Development and Finance.
Timothy Walbert is chairman of Horizon Pharma:
Speaking about the opening of the company's new headquarters, Enda Kenny said "attracting companies like Horizon Pharma to establish and create jobs in Ireland is one of the Government's key missions as we work to secure the recovery and ensure that more people begin to feel the benefits in their daily lives".