A Study of Niclosamide Enemas in Subjects With Active Ulcerative Proctitis or Ulcerative Proctosigmoiditis

Study Purpose

This will be a phase I/IIa, open-label, three-stage, single center study aimed at investigating the safety, the efficacy (clinical and endoscopic effects) and the pharmacokinetics of Niclosamide enema 150 mg/60 ml and 450 mg/60 ml in subjects with mild-to-moderate UP and UPS, defined as a Modified Mayo Score (MMS) ≥ 4 and < 8, with a stool frequency subscore (SFS) ≥ 1, a rectal bleeding sub-score (RBS) = 1 or 2, and an endoscopic subscore (mucosal appearance) = 1 or 2. At the endoscopic sub-score any degree of friability will be classified as having a sub-scale score of 2.

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 18 Years and Over
Gender All
More Inclusion & Exclusion Criteria

Inclusion Criteria:

1. Male or female subjects aged ≥ 18 years at the time of signing the informed consent; 2. Must understand and voluntarily sign an informed consent from (ICF) prior to any study-related assessments/procedures being conducted. 3. Must be able to adhere to the study visit schedule and other protocol requirements; 4. Diagnosis of UP or UPS with a duration of at least 3 months prior to the Screening Visit. 5. MMS score ≥4 to < 8 (range: 0-9) prior to enrolment in the study. 6. Availability to perform an endoscopy (colonoscopy or flexible rectosigmoidoscopy);

Exclusion Criteria:

1. Diagnosis of Crohn's disease, indeterminate colitis, ischemic colitis, microscopic colitis, radiation colitis, or diverticular disease-associated colitis; 2. UC extended more than 40 cm from the anal verge; 3. Subjects who have had surgery as a treatment for UC or who, in the opinion of the Investigator, are likely to require surgery for UC during the study; 4. History of any clinically significant neurological, renal, hepatic, gastrointestinal, pulmonary, metabolic, psychiatric, endocrine, hematological disorder or disease or any other medical condition that, in the Investigator's opinion, would preclude participation in the study; 5. Any condition, including the presence of laboratory abnormalities, which places the subject at unacceptable risk if he/she was to participate in the study or confounds the ability to interpret data from the study; 6. Pregnant or breast feeding females; 7. Known active current or history of recurrent bacterial, viral, fungal, mycobacterial, or other infections (including but not limited to tuberculosis, atypical mycobacterial disease, and herpes zoster), human immunodeficiency virus (HIV), or any major episode of infection requiring hospitalization or treatment with intravenous (IV) or oral antibiotics within 4 weeks of screening; 8. Subjects who have received any investigational drug or device in the last 3 months; 9. History of alcohol, drug, or chemical abuse within the last 6 months; 10. Known hypersensitivity to niclosamide or any excipients in the formulation.

Trial Details

Trial ID:

This trial id was obtained from ClinicalTrials.gov, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Phase 1/Phase 2
Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

First Wave Bio, Inc.
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

James Pennington, M.D.
Principal Investigator Affiliation First Wave BioPharma
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Overall Status Recruiting
Countries Italy

The disease, disorder, syndrome, illness, or injury that is being studied.

Ulcerative Colitis, Ulcerative Proctitis, Ulcerative Proctosigmoiditis
Arms & Interventions


Experimental: 150 mg/60 ml

Niclosamide enemas 150 mg/60 ml given twice daily for 6 weeks

Experimental: 450 mg/60 ml

Niclosamide enemas 450 mg/60 ml given twice daily for 6 weeks


Drug: - Niclosamide

enema given twice daily for 6 weeks

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

International Sites

Tor Vegata, Rome, Italy




Tor Vegata

Rome, ,

Site Contact

Giovanni Monteleone, MD



The content provided on clinical trials is for informational purposes only and is not a substitute for medical consultation with your healthcare provider. We do not recommend or endorse any specific study and you are advised to discuss the information shown with your healthcare provider. While we believe the information presented on this website to be accurate at the time of writing, we do not guarantee that its contents are correct, complete, or applicable to any particular individual situation. We strongly encourage individuals to seek out appropriate medical advice and treatment from their physicians. We cannot guarantee the availability of any clinical trial listed and will not be responsible if you are considered ineligible to participate in a given clinical trial. We are also not liable for any injury arising as a result of participation. For a full description of terms please refer to our Terms, Conditions & Privacy.