Joint Filer Information

Names:	Deerfield Mgmt, L.P.,  Deerfield Management Company, L.P., Deerfield Partners, L.P., Deerfield International Master Fund, L.P. Deerfield Special Situations Fund, L.P.
Address:	780 Third Avenue, 37th Floor New York, NY  10017
Designated Filer:	James E. Flynn
Issuer and Ticker Symbol:	Antares Pharma, Inc. [ATRS]
Date of Event Requiring Statement:	May 11, 2015

The undersigned, Deerfield Mgmt, L.P.,  Deerfield Management Company, L.P., Deerfield Partners, L.P. Deerfield Special Situations Fund, L.P. and Deerfield International Master Fund, L.P., are jointly filing the attached Initial Statement of Beneficial Ownership on Form 3 with James E. Flynn with respect to the beneficial ownership of securities of Antares Pharma, Inc.

Signatures:

DEERFIELD MGMT, L.P. By:  J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler        Jonathan Isler, Attorney-In-Fact	DEERFIELD PARTNERS, L.P. By:  Deerfield Mgmt, L.P., General Partner By:  J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler        Jonathan Isler, Attorney-In-Fact
DEERFIELD MANAGEMENT COMPANY, L.P. By:  Flynn Management LLC, General Partner By: /s/ Jonathan Isler        Jonathan Isler, Attorney-In-Fact	DEERFIELD INTERNATIONAL MASTER FUND, L.P. By:  Deerfield Mgmt, L.P., General Partner By:  J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler        Jonathan Isler, Attorney-In-Fact

DEERFIELD SPECIAL SITUATIONS FUND, L.P.

By:  Deerfield Mgmt, L.P., General Partner

By:  J.E. Flynn Capital, LLC, General Partner

By: /s/ Jonathan Isler

       Jonathan Isler, Attorney-In-Fact