Key Inclusion Criteria:  Diagnosis of IPF established according to the 2018 joint ATS/ERS/JRS/ALAT Clinical Practice Guideline FEV1/FVC ratio ≥0.65 at the screening visit Haemoglobin-corrected diffusion capacity of carbon monoxide (Hb-corrected DLCO) ≥25% within 12 months of the screening visit Arterial oxygen saturation on room air or oxygen ≥90% at Screening Life expectancy of at least 12 months Cough that is attributed to IPF, which has not responded to anti-tussive treatment, and which has been present for at least 8 weeks prior to Screening Mean daily IPF Coughing Severity Scale score ≥5.0 during the second week of the baseline assessment period  Key Exclusion Criteria:  Recent respiratory tract infection (<8 weeks prior to Screening) Recent acute exacerbation of IPF (<8 weeks prior to Screening) Current smokers or ex-smokers with <6 months' abstinence prior to Screening Emphysema ≥50% on high-resolution computed tomography, or the extent of emphysema is greater than the extent of fibrosis according to the reported results of the most recent scan Mean early morning cough scale score ≥5.0 and rest of the day cough scale score <5 during the second week of the baseline assessment period (assessed at Visit 2) Cough that is predominantly productive in nature and attributable to lung pathology such as chronic bronchitis or bronchiectasis