This multicenter, randomized, double-blind, placebo-controlled, parallel-group clinical
study is designed to evaluate the safety and tolerability of 3 dose levels of TTI-101 vs placebo in participants with idiopathic pulmonary fibrosis (IPF). a screening period of up to 28 days, 100 participants will be randomly assigned to receive 1 of 3 dose levels of TTI-101 (25 participants per dose level) or matching placebo (25 participants). Enrollment will be stratified by current use of nintedanib. The assigned study drug will be self-administered orally in tablet form twice daily (BID) with a glass of water after a meal. Once randomized, each participant will maintain their current standard of care supportive medications, including cough treatment, medications for symptom relief or quality of life improvements, oxygen therapy where indicated, respiratory physiotherapy, and treatment of comorbidities. Following randomization, all participants will enter the 12-week, double-blind treatment period.