Following the study Entry Visit, subjects will return at Week 4,
Week 12, and every 12 weeks thereafter. Study visits will continue
for up to 6 years or until the subject prematurely discontinues study
treatment due to an adverse event or other reason, inhaled treprostinil
becomes commercially available for IPF in the region in which the
study is conducted, or the study is discontinued by the Sponsor
(whichever is sooner). Subjects will also be contacted by telephone or
email at least weekly until Week 12 and monthly thereafter in
between study visits to discuss study drug titration, assess study drug
tolerability, monitor adverse event, document changes to concomitant
medications, and remind subjects to bring in all study drug and a
device to their next clinic visit.

This is a Phase 3, randomized, double-blind, placebo-controlled, efficacy and safety study of subjects with IPF treated with inhaled treprostinil over a 52-week period. This study is investigating whether a drug called inhaled treprostinil (brand name Tyvaso®) works to help people with IPF improve their lung function tests. The purpose of this research study is to see how well inhaled treprostinil works in participants with IPF and to gather information on how safe it is. This study will look at changes in your breathing tests, also called lung function tests. About 396 people will participate in this study from about 100 medical centers. Your participation in this study is voluntary and will last approximately 58 weeks. This time includes a Screening Period that could last up to approximately 6 weeks plus a 52-week Treatment Period.