The effects of sitaxentan on sildenafil pharmacokinetics and pharmacodynamics in healthy subjects.

"Competing interests None to declare. This study was supported by Encysive Pharmaceuticals Inc., Houston, TX, USA, which was acquired by Pfizer Inc. in June 2008. F.S. was employed by Encysive Pharmaceuticals at the time of this research. W.G.K. was a paid consultant to Encysive with regard to this study. M.R.W. has recived reimbursement for attending symposia sponsored by Encysive Pharmaceuticals, the manufacturer of sitaxentan. Editorial assistance in the preparation of this manuscript was provided by Amy Jackson, MPhil, at Fishawack Communications and was funded by Encysive Pharmaceuticals Inc. and by Janet E. Matsuura, PhD, at Complete Healthcare Communications, Inc. and was funded by Pfizer Inc."

"Competing interests: None to declare.: This study was supported by Encysive Pharmaceuticals Inc., Houston, TX, USA, which was acquired by Pfizer Inc. in June 2008. F.S. was employed by Encysive Pharmaceuticals at the time of this research. W.G.K. was a paid consultant to Encysive with regard to this study. M.R.W. has recived reimbursement for attending symposia sponsored by Encysive Pharmaceuticals, the manufacturer of sitaxentan. Editorial assistance in the preparation of this manuscript was provided by Amy Jackson, MPhil, at Fishawack Communications and was funded by Encysive Pharmaceuticals Inc. and by Janet E. Matsuura, PhD, at Complete Healthcare Communications, Inc. and was funded by Pfizer Inc."