PRESS RELEASE

SILVER SPRING, Md., April 24 /PRNewswire-FirstCall/ -- United Therapeutics Corporation (Nasdaq: UTHR) announced today that it will release its 2009 first quarter financial results before market open on Friday, May 1, 2009.

United Therapeutics will host a half-hour teleconference on Friday, May 1, 2009, at 9:00 a.m. Eastern Time. The teleconference is accessible by dialing 877-718-5092, with international callers dialing 719-325-4795. A rebroadcast of the teleconference will be available for one week and can be accessed by dialing 888-203-1112, with international callers dialing 719-457-0820, and using passcode: 9448698.

This teleconference is also being webcast and can be accessed via United Therapeutics' website at http://ir.unither.com/events.cfm.

United Therapeutics Corporation is a biotechnology company focused on the development and commercialization of unique products to address the unmet medical needs of patients with chronic and life-threatening cardiovascular and infectious diseases and cancer. [uthr-g]

SOURCE United Therapeutics Corporation