Eligibility criteria
Condition
Pulmonary Arterial Hypertension, Pulmonary Hypertension
Sex
Females and Males
Age
16-80 years
Inclusion criteria
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- Previously enrolled in B1321001 for at least 4 weeks.
- Previously enrolled in B1321003, discontinued from the study.
- Completed the B1321003 study as planned.
Exclusion criteria
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- Treated with an investigational drug (other than sitaxsentan or sildenafil in either
B1321001 or B1321003) or device that has not received regulatory approval within the
30 days prior to Baseline/Day 1 or during the study.