PRESS RELEASE

SILVER SPRING, Md., Feb. 13 /PRNewswire-FirstCall/ -- United Therapeutics Corporation (Nasdaq: UTHR) announced today that it will release its 2006 fourth quarter and annual financial results before the open of market on Tuesday, February 20, 2007.

United Therapeutics will host a half-hour teleconference on Tuesday, February 20, 2007, at 9:00 a.m. Eastern Time. The teleconference is accessible by dialing 800-603-1777, with international dialers calling +1-706-679-8129. A rebroadcast of the teleconference will be available for one week following the teleconference by dialing 800-642-1687, with international callers dialing +1-706-645-9291, and using the conference call identification number 8783337.

United Therapeutics is a biotechnology company focused on the development and commercialization of innovative therapeutic products for patients with chronic and life-threatening cardiovascular, cancer and infectious diseases.

SOURCE United Therapeutics Corporation