Thanks for pointing out the presentation. I took a look at it. FYI Thelin is Sitaxentan. I looked up why it was removed it was because of liver tox (I believe Tracleer has a black box warning about raising liver enzymes). I'm not sure about liver side effects with Letairis (I think its safer). Tracleer's patent life runs out in 2015 (EDIT I thought it was sooner but looked it up and saw 2015). I believe Letairis is around that as well.
Noticed some bad typing in prior posts. So no one worries I had a stroke its just using swipe on a phone :-)
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