OPNT Opiant Pharmaceuticals Inc

OPNET Technologies, Inc. (Nasdaq:OPNT) will hold an investor conference call on Tuesday, August 2 at 5:00 pm Eastern Time to review financial results for the first quarter of fiscal 2012.

To listen to the OPNET investor conference call:

• Call 877-377-7550 in the U.S. or 408-337-0151 for international callers, or
• Use the webcast at www.opnet.com/news. Investors are advised to go to the web site at least 15 minutes early to register, download, and install any necessary audio software.

To listen to the archived call:

• Call the replay phone number at 800-642-1687 or 706-645-9291 for international callers. For replay, enter passcode # 81559932. The replay will be available from 8:00 pm Eastern Time August 2, 2011 through 11:59 pm Eastern Time August 9, 2011.
• The webcast will be available at www.opnet.com/news. The webcast will be archived for seven days.

The first quarter of fiscal 2012 financial results will be released after the market closes on Tuesday, August 2, 2011.

About OPNET Technologies, Inc.

Founded in 1986, OPNET Technologies, Inc. (Nasdaq:OPNT) is a leading provider of solutions for application and network performance management. For more information about OPNET and its products, please visit www.opnet.com.

OPNET and OPNET Technologies, Inc. are trademarks of OPNET Technologies, Inc. All other trademarks are the property of their respective owners.

CONTACT: OPNET Media Contact:
         Sue Cole
         OPNET Technologies, Inc.
         (919) 461-2445
         Media@opnet.com
         www.opnet.com
         
         OPNET Investor Relations:
         Mel Wesley
         OPNET Technologies, Inc.
         (240) 497-3000
         ir@opnet.com
         www.opnet.com