Completed Clinical Trials
AIR: Randomized, double-blind, multicenter, placebo-controlled phase 3 trial1,4
The combined primary endpoint was clinical response at 12 weeks, defined as:
- At least 10% increase vs baseline in 6-minute walk distance1
- Improvement by at least one NYHA Class vs baseline1,4
- Lack of clinical deterioration or death
STEP: Randomized, double-blind, placebo-controlled phase 2 trial

Safety in combination with an ERA
- In a small study, 34 Functional Class III-IV patients treated with bosentan 125 mg bid for at least 16 weeks tolerated the addition of inhaled iloprost (up to 5 mcg 6 to 9 times per day during waking hours). The mean daily inhaled dose was 27 mcg and the mean number of inhalations per day was 5.6.1
- Safety trends in patients receiving concomitant bosentan and iloprost were consistent with those observed in the larger Phase 3 study (AIR) in patients receiving only iloprost.1
