Treprostinil Data Presented at American Thoracic Society Conference Demonstrates Significant Clinical Progress in All Four Routes of Admi...(nefits. Investor Q&A Session Unite...),Health

Investor Q&A Session

United Therapeutics will host an investor Q&A session following the conclusion of the ATS conference at The Westin Harbour Castle, One Harbour Square, Toronto, Ontario, on May 21, 2008, at 5:00 pm EDT. Vallerie McLaughlin, MD, Director of the Pulmonary Hypertension Program at the University of Michigan, will join United Therapeutics' senior management in this Q&A session, which is also being webcast and can be accessed via United Therapeutics' website at http://ir.unither.com/events.cfm.

About Remodulin

Remodulin is indicated for the treatment of PAH in patients with NYHA Class II-IV symptoms to diminish symptoms associated with exercise. It may be administered as a continuous subcutaneous infusion or continuous intravenous infusion; however, because of the risks associated with chronic indwelling central venous catheters, including serious blood stream infections, continuous intravenous infusion should be reserved for patients who are intolerant of the subcutaneous route, or in whom these risks are considered warranted.

Remodulin is indicated to diminish the rate of clinical deterioration in patients requiring transition from Flolan(R); the risks and benefits of each drug should be carefully considered prior to transition.

Important Safety Information

Chronic intravenous infusions of Remodulin are delivered using an indwelling central venous catheter. This route is associated with the risk of blood stream infections (BSI) and sepsis, which may be fatal. Remodulin is contraindicated in patients with hypersensitivity to Remodulin, its ingredients, or similar drugs. Remodulin is a potent vasodilator. It lowers blood pressure, which may be further lowered by other drugs that also reduce blood pressure. Remodulin inhibits platelet aggregation and therefore, may increase the risk of bleeding, particularly in patients on anticoagulants
'/>"/>