For Investors

Please direct Shareholder inquires to:

Shari Lovell
Director, Shareholder Services
DUSA Pharmaceuticals, Inc.
555 Richmond Street West
Suite 300 P.O. Box 704
Toronto, Ontario M5V 3B1

416-363-5059 Telephone ext. 1121
416-363-6602 FAX
E-Mail Address: Investor-relations@dusapharma.com

Corporate Office

DUSA Pharmaceuticals, Inc.
25 Upton Dr.
Wilmington, MA 01887
978-657-7500 Telephone
978-657-9193 FAX

Transfer Agent and Registrar

American Stock Transfer & Trust Company
40 Wall Street, 46th Floor
New York, NY 10005

Auditors

Deloitte & Touche LLP
Boston, MA