Exhibit A

 

Joint Filing Agreement

 

The undersigned agree that this Schedule 13G, and all amendments thereto, relating to the Common Stock of Catalyst Pharmaceuticals, Inc. shall be filed on behalf of the undersigned.

 

DEERFIELD MGMT, L.P.

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 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

 

JAMES E. FLYNN

 

/s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

 

 

Exhibit B

 

Due to the relationships between them, the reporting persons hereunder may be deemed to constitute a “group” with one another for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934.

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