Dyspnea at rest due to complications of advanced malignancy or other disease requiring continuous oxygen therapy. 9. Positive results of screening test for human immunode ficiency virus (HIV). 10. Current chronic daily treatment (continuous for > 3 months) with systemic corticosteroids (dose equivalent to or greater than 10 mg/day methylprednisolone), excluding inhaled steroids. Short- term steroid use to prevent IV contrast all ergic reaction or anaphylaxis in subjects who have known contrast allergies is allowed. 11. Known hypersensitivity to any component of the study medication(s). 12. Subjects taking any medication(s) (herbal or prescribed) known to have an adverse drug reaction with any of the study medications. 13. Concurrent or prior use of a strong cytochrome P450 (CYP)3A4 inhibitor (including ketoconazole, itraconazole, posaconazole, clarithromycin, indinavir, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, voriconazole, and grapefruit products) or strong CYP3A4 inducers (including phenytoin, carbamazepine, rifampin, rifabutin, rifapentin, phenobarbital, and St John's Wort) within 14 days before study day 1. 14. Concurrent or prior use of a strong CYP2C8 inhibitor (gemfibrozil) or moderate CYP2C8 inducer (rifampin) within 14 days before study day 1. 15.