Nintedanib With or Without Dextromethorphan in Patients With Idiopathic Pulmonary Fibrosis (IPF)

A Multicenter, Randomized, Double Blind, Placebo-controlled Clinical Study to Evaluate the Treatment of Nidanib With or Without Dextromethorphan in Idiopathic Pulmonary Fibrosis (IPF) Patients.

Nintedanib combined with or without Dextromethorphan for the treatment of IPF, with FVC as the primary efficacy endpoint to evaluate its effectivenes.

Study Overview

• Status: Not yet recruiting
• Conditions: Idiopathic Pulmonary Fibrosis (IPF)
• Intervention / Treatment: Drug: Nintedanib,Dextromethorphan; Drug: Nintedanib,Placebo

• Study Type: Interventional
• Enrollment (Estimated): 60
• Phase: Phase 2

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Age ≥40 years old, regardless of gender;
2. According to "2022 ATS/ERS/JRS/ALAT Guidelines", it was diagnosed as idiopathic pulmonary fibrosis (IPF);
3. Lung function meets the following conditions during screening: forced vital capacity (FVC) ≥45% predicted value; The dispersion of carbon monoxide (DLco, corrected Hb) in a single breath is between 30% and 80% of the predicted value.
4. HRCT images completed within 12 months before screening can be used to determine UIP mode;
5. It is expected to complete the whole research plan, including 12 weeks of treatment and 1 week of follow-up;
6. Willing to follow all the requirements of drug use, visit and data collection during the study period;
7. Be able to understand the research content and sign the written informed consent;
8. Women of childbearing age provide negative pregnancy test results, and agree to take effective contraceptive measures during the study period and within 3 months after the last administration; Male subjects with fertility also need to take effective contraception at the same time.

Exclusion Criteria:

1. Suffering from other interstitial lung diseases caused by non-IPF reasons (such as connective tissue disease-related ILD, chronic allergic pneumonia, pneumoconiosis, drug-induced pneumonia, radiation lung disease, etc.);
2. One or more Acute Exacerbation)； of IPF occurred within 3 months before screening;
3. Have received a lung transplant;
4. Complicated with severe COPD(GOLD III and above), severe asthma or other airway diseases that may interfere with FVC determination;
5. The following systemic immunosuppressive treatments were used within 4 weeks before screening: > 15 mg/d prednisone (or equivalent dose), cyclophosphamide, methotrexate, tuzumab, rituximab, mycophenolate mofetil, etc.
6. Currently or in the past, allergic to Nidanib, dextromethorphan or any of its auxiliary ingredients;
7. The following laboratory abnormalities exist: ALT or AST >3×ULN；; eGFR <30 mL/min/1.73m²；
8. Have a history of uncontrolled mental illness, epilepsy, central nervous system dysfunction, or may induce adverse reactions after using dextromethorphan;
9. Being receiving drugs that may have serious drug interaction with dextromethorphan, such as monoamine oxidase inhibitor (MAOI) and selective serotonin reuptake inhibitor (SSRI), and unable to stop taking drugs;
10. Pregnant or lactating women;
11. At the time of screening, there are other major diseases or medical conditions that researchers think will significantly increase the risk and affect the treatment compliance or data interpretation;
12. Interventional treatment of other clinical trials within 4 weeks before screening.
13. Use Nidanib or pirfenidone for anti-fibrosis treatment within 8 weeks before screening;

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Experimental group; Experimental: The dosage of Nintedanib is 150mg/100mg per dose, twice daily；The dosage of Dextromethorphan is 30mg per dose, twice daily.	Drug: Nintedanib,Dextromethorphan; Dosage of Nitedanib is 150mg/100mg each time, twice a day, once in the morning and once in the evening, It is recommended to take it with meals. The dosage of Dextromethorphan sustained-release tablets is 30 mg, twice a day. It is recommended to take it orally 30 minutes after meals. For 12 weeks.
Placebo Comparator: Control group; Control group：The dosage of Nintedanib is 150mg/100mg per dose, twice daily；Placebo take orally twice daily.	Drug: Nintedanib,Placebo; Dosage of Nitedanib is 150mg/100mg each time, twice a day, once in the morning and once in the evening, with an interval of 12hours. It is recommended to take it with meals to reduce gastrointestinal adverse reactions. Placebo, twice a day, recommended to be taken in the morning and evening. For 12 weeks.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
FVC	The change in FVC from baseline at week 12 after administration

Secondary Outcome Measures

Outcome Measure	Time Frame
Leicester Cough score (LCQ)	Change in score from baseline to week 12
Symptoms and Effects Scale(L-PF)	Change in score from baseline to week 12
Incidence Rate of Acute Aggravating Events(%predicted)	Incidence Rate of Acute Aggravating Events during the 12-week study period
DLCO(%predictedl)	Change in score from baseline to week 12
Incidence of Treatment-related adverse Events	The assessments need to be conducted four times at baseline and at weeks and 12 after medication

Collaborators and Investigators

• Sponsor: First Affiliated Hospital of Wenzhou Medical University

Study record dates

Study Major Dates

• Study Start (Estimated): May 12, 2026
• Primary Completion (Estimated): March 1, 2027
• Study Completion (Estimated): June 1, 2027

Study Registration Dates

• First Submitted: September 4, 2025
• First Submitted That Met QC Criteria: May 8, 2026
• First Posted (Actual): May 13, 2026

Study Record Updates

• Last Update Posted (Actual): May 13, 2026
• Last Update Submitted That Met QC Criteria: May 8, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Respiratory Tract Diseases; Lung Diseases; Lung Diseases, Interstitial; Pulmonary Fibrosis; Idiopathic Pulmonary Fibrosis; Heterocyclic Compounds; Heterocyclic Compounds, Fused-Ring; Alkaloids; Polycyclic Aromatic Hydrocarbons; Polycyclic Compounds; Heterocyclic Compounds, 4 or More Rings; Morphinans; Opiate Alkaloids; Heterocyclic Compounds, Bridged-Ring; Phenanthrenes; Dextromethorphan; nintedanib
• Other Study ID Numbers: Dextro-Nin-IPF-II

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No