Actelion to discuss first quarter 2009 financial results

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Actelion senior management to host Q & A session

Dear Member of the Investment Community

Actelion Ltd will announce the first quarter 2009 financial results
on Tuesday, 21 April 2009, at 07.00 hrs CEST / 06.00 hrs BST / 01.00
a.m. EDT. An investor conference call & webcast will be held at 15.30
hrs, CEST to discuss the results.

To discuss the results, Actelion will host an Investor Conference
Call / Webcast as follows:

Date/Time:

21 April 2009 15.30 hrs - 16.45 hrs Basel (CEST)
14.30 hrs - 15.45 hrs U.K. (BST)
09.30 a.m. - 10.45 a.m. U.S. (EDT)

Conference Call Connect #:

Dial-in participants should start calling the number below 10-15
minutes before the Conference is due to start.

Dial: Europe: +41 44 580 65 22
U.K.: +44 207 108 62 06
U.S.: +1 866 895 85 61

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
http://www.actelion.com/
10-15 minutes before the conference is due to start. If you
experience any access problems go directly to the URL:
http://gaia.world-television.com/actelion/20090421/trunc

Participant's mode:
Listen-Only with possibility to ask individual questions by clicking
on the Q&A button.
Participants will be asked to provide their Name and Company.

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

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Actelion Pharmaceuticals Ltd
Gewerbestrasse 16 Allschwil
Switzerland

WKN: 936767; ISIN: CH0010532478; Index: SBIOM, SLIFE, SMCI, SMIEXP,
SMIM, SPI, SPIEX;
Listed: Main Market in SIX Swiss Exchange;
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