Actelion Invitation to Investor Conference Call / Webcast


ALLSCHWIL, Switzerland, May 15, 2003 (PRIMEZONE) -- Actelion to host Conference Call/Webcast following ATS presentation by opinion leader Dr Vallerie McLaughlin on 19 May 2003 (Seattle)At the upcoming American Thoracic Society (ATS) Scientific Sessions to be held in Seattle (Washington/USA) on 19 May 2003, Dr. Vallerie McLaughlin, MD, Rush Presbyterian Medical Center, Chicago, will present an analysis of long-term follow-up data, which showed a positive long-term survival benefit involving 169 primary pulmonary hypertension patients, who were treated with Tracleer(R) as first line treatment and were enrolled in the Tracleer(R) pivotal registration studies.

Dr. McLaughlin's presentation at the ATS is part of the symposium "Pulmonary Hypertension: Mediators and Therapeutic Options", scheduled for Monday, 19 May 2003, 01.30 p.m.-04.15 p.m. at the Sheraton Seattle Hotel and Tower, Grand Ballroom B (2nd Floor).

Dr. McLaughlin has agreed to present at an Actelion-sponsored webcast and conference call where she will also be available to take questions.

Date/Time:

Tuesday, 20 May 2003, 08.00 a.m. (CET) / 02.00 a.m. (EST) / Monday, 19 May 2003, 11.00 p.m. (CST)


 Conference Call Connect #:
 Dial-in  participants should start calling the number below 10-15
 minutes before the Conference is due to start.
 --      European participants should dial +41 (0)91 610 56 00
 --      U.S. participants should dial  +1 412 858 46 00
 --      U.K. participants should dial +44 207 107 06 11

Participant's mode:

Listen-Only with possibility to open individual lines during Q&A session. Participants will be asked for their Name and Company.

Webcast Access: Webcast participants should visit the Actelion Website www.actelion.com for further details 10-15 minutes before the conference is due to start.

Participant's mode:

Listen-Only with possibility to ask individual questions by clicking on the Q&A button. E-mail questions will be answered after the call itself is over. Participants will be asked to provide their Name and Company.

Webcast Replay: The archived Investor Webcast will be available for replay through www.actelion.com approximately 60 minutes after the call has ended.