Was This Drug Destined for Failure?

I always figured management at formerly independent Encysive Pharmaceuticals was just incompetent in its failure to get its pulmonary arterial hypertension drug Thelin approved in the U.S. time and time and time again.

But now I'm thinking Thelin is just cursed.

The drug's new owner, Pfizer (NYSE: PFE  ) , announced today that it's pulling Thelin off the market and withdrawing the marketing application with the Food and Drug Administration because a new side effect was discovered. It was always know that Thelin and the drugs in the same class had a risk of liver toxicity, but the new data suggest injury to the liver is more severe.

Bye-bye, Thelin; at least Pfizer didn't pay much for you.

With every loser, there's a winner. Or in this case a few, since there are a number of pulmonary arterial hypertension drugs on the market. Pfizer sells Revatio, which is just Viagra under a different name, so Pfizer isn't completely out of the market. Similarly, Eli Lilly's (NYSE: LLY  ) erectile dysfunction drug Cialis is marketed by United Therapeutics (Nasdaq: UTHR  ) under the trade name Adcirca. United Therapeutics also has a PAH drug Remodulin, which could benefit from a little less competition.

But the two drugs that will likely benefit most are Actelion's Tracleer and Gilead Sciences' (Nasdaq: GILD  ) Letairis, since they're in the same class of drugs. Doctors are more likely to switch between an endothelin receptor antagonist than into a new class if Thelin was actually working for the patient.

It's always a little sad to see a drug die in development, but considering the long and tumultuous road Thelin has been on, maybe it's only fitting to see it have a sudden heart attack and die before ever making it to the market in the U.S.

Interested in keeping track of Pfizer and the other drugs in its pipeline? Click here to add it to My Watchlist, which will help you keep track of all our Foolish analysis on Pfizer.

Pfizer is a Motley Fool Inside Value recommendation. Gilead Sciences is a Motley Fool Stock Advisor selection. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors.

Fool contributor Brian Orelli, Ph.D., doesn't own shares of any company mentioned in this article. The Fool has a disclosure policy.


Read/Post Comments (0) | Recommend This Article (0)

Comments from our Foolish Readers

Help us keep this a respectfully Foolish area! This is a place for our readers to discuss, debate, and learn more about the Foolish investing topic you read about above. Help us keep it clean and safe. If you believe a comment is abusive or otherwise violates our Fool's Rules, please report it via the Report this Comment Report this Comment icon found on every comment.

Be the first one to comment on this article.

Sponsored Links

Leaked: Apple's Next Smart Device
(Warning, it may shock you)
The secret is out... experts are predicting 458 million of these types of devices will be sold per year. 1 hyper-growth company stands to rake in maximum profit - and it's NOT Apple. Show me Apple's new smart gizmo!

DocumentId: 1396739, ~/Articles/ArticleHandler.aspx, 10/21/2014 9:50:41 PM

Report This Comment

Use this area to report a comment that you believe is in violation of the community guidelines. Our team will review the entry and take any appropriate action.

Sending report...


Advertisement