A Phase 3 interventional study of Nitazoxanide and Placebo in COVID-19, sponsored by Romark Laboratories L.C.. Completed at 2 sites in United States. Open to participants aged 12 Years to 120 Years. Per ClinicalTrials.gov, last updated 2024-03-29.
Sponsored by Romark Laboratories L.C. · Phase 3, Interventional, and Treatment
Among 24 studies testing nitazoxanide in COVID-19 — 2 open to participants now, 2 under way, none of them phase 3. nitazoxanide · COVID-19.
Among the 24 studies testing nitazoxanide in COVID-19, this one is the 4th largest by enrollment, is one of 18 that started in 2020, is one of 6 in phase 3, and was the 11th registered.
7,992 studies on the registry are indexed under COVID-19; 466 are open to participants now.
Browse COVID-19 studies →2 of the 24 studies testing nitazoxanide in COVID-19 are open now, in 7 countries. Recruiting first, the newest first:
University of Oxford · Sites in Brazil, Laos, Nepal and 2 more countries
Ages 18–60
University of Liverpool · Sites in South Africa, United Kingdom
Ages 18+
By country, each count listing its studies:
nitazoxanide: first FDA approval 2002 (ALINIA). What it is approved for, and how studies give it, is on its page →
Of the 356 COVID-19 studies recruiting now, 206 (58%) set no upper age limit and 83 (23%) stop at 75 or younger; 91 take children under 18; 135 take healthy volunteers.
This study: 12 Years to 120 Years · all sexes · no healthy volunteers.
The full table on the hub →This tab as a report to print or save as PDF → With an account.
24 studies; the count open now beside each. This study's row is marked.
A study in two phases is counted once above. Listed by phase, each with its combined phases: Phase 1 1 · Phase 2 16 · Phase 3 12 · Phase 4 1
First in 2020; this study’s year is marked. 18 started in 2020.
By drug class, each counting the studies that test any of its medicines:
This study's enrollment of 935 is above the median of 102 across 4,365 interventional studies indexed under COVID-19.
Median enrollment 163 across the 24 interventional studies. Of the 12 that completed or were terminated, 5 (42%) have results posted.
This tab as a report to print or save as PDF → With an account.
11 of 24 have an industry lead sponsor. The 10 most frequent:
Romark Laboratories L.C. is the lead sponsor of 29 studies on the registry; none are open to participants now.
Of its 7 completed or terminated interventional studies of FDA-regulated products, 7 (100%) have results posted.
Romark Laboratories L.C. has 5 studies filed under COVID-19 — fewer than ten, so there is no comparison to draw.
2 of the studies testing nitazoxanide in COVID-19 that are under way reach primary completion within a year, 0 of them phase 3. Phase 3 first, then by date:
| Study | Primary completion |
|---|---|
| NCT05041907University of OxfordFinding Treatments for COVID-19: A Trial of Antiviral Pharmacodynamics in Early Symptomatic COVID-19 (PLATCOV) | 2027-01 |
| NCT04746183University of LiverpoolAGILE (Early Phase Platform Trial for COVID-19) | 2027-03-31 |
Add all 2 to your calendar (.ics) → With an account.
Among the 24 studies testing nitazoxanide in COVID-19, from their registry updates:
Nothing recorded among them since 2026-09-25.
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Trial to Evaluate Efficacy and Safety of Nitazoxanide in the Treatment of Mild or Moderate COVID-19
Phase 3, Multicenter, Randomized, Double-Blind, Placebo-Controlled Trial to Evaluate Efficacy and Safety of Nitazoxanide in the Treatment of Mild or Moderate COVID-19
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Presence of clinical signs and/or symptoms consistent with worsening or stable mild or moderate COVID-19 (one of the following is required):
AND patient reported assessment that symptoms are present, the symptoms are not consistent with the subject's usual health, the symptoms interfere with daily activities, and the symptoms have worsened or remained the same relative to the previous day, as confirmed by responses to questions in the Screening FLU-PRO.
Exclusion Criteria:
Persons with any clinical sign or symptoms suggestive of severe systemic illness with COVID-19, including the following:
Severely immunodeficient persons including:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CD4 count
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Postmenopausal
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Excipients
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Two nitazoxanide 300 mg tablets orally twice daily for 5 days
Drug: Nitazoxanide · Dietary Supplement: Vitamin Super B-Complex
Two placebo tablets orally twice daily for 5 days
Drug: Placebo · Dietary Supplement: Vitamin Super B-Complex
Two nitazoxanide 300 mg tablets administered orally twice daily with food for 5 days
Also known as: NTZ (nitazoxanide), NT-300
Two placebo tablets administered orally twice daily with food for 5 days
Vitamin Super B-Complex administered orally twice daily to maintain the blind
Time to Sustained Clinical Recovery
Time to Sustained Clinical Recovery is the time in days from the first dose of study medication to the first time at which the subject reports a decrease in total FLU-PRO score from the previous diary with assessment that symptoms are at least "somewhat better than yesterday", no oral temperature ≥100.4 F in the prior 24 hours, and no future increase in any of the FLU-PRO domains except within validated background levels.
Time frame: Up to 21 days
Proportion of Subjects Progressing to Severe COVID-19
Analysis of proportions of subjects with progression to severe COVID-19 illness defined as subject-reported shortness of breath at rest and blood oxygen saturation ≤93% on room air
Time frame: Up to 21 days
Proportion of Subjects Positive for SARS-CoV-2 by Aptima® SARS-CoV-2 Assay at Each of Days 4 and 10
Time frame: Day 4 and Day 10
Change From Baseline in Quantitative SARS-CoV-2 RNA Measured by RT-PCR at Each of Days 4 and 10
Time frame: Day 4 and Day 10
Proportion of Subjects Requiring Hospitalization
Analysis of proportions of subjects requiring hospitalization for any reason during the study period
Time frame: 28 days
All-Cause Mortality
Analysis of proportions experiencing mortality from any cause during the study period
Time frame: 28 days
| Milestone | Nitazoxanide | Placebo |
|---|---|---|
| Started | 472 | 463 |
| Completed | 453 | 446 |
| Not completed | 19 | 17 |
| Withdrew: Lost to follow-up | 7 | 9 |
| Withdrew: Withdrawal by subject | 8 | 6 |
| Withdrew: Physician decision | 1 | 1 |
| Withdrew: Death | 2 | 0 |
| Withdrew: Protocol violation | 1 | 1 |
Time to Sustained Clinical Recovery is the time in days from the first dose of study medication to the first time at which the subject reports a decrease in total FLU-PRO score from the previous diary with assessment that symptoms are at least "somewhat better than yesterday", no oral temperature ≥100.4 F in the prior 24 hours, and no future increase in any of the FLU-PRO domains except within validated background levels.
| days | Nitazoxanide | Placebo |
|---|---|---|
| Time to Sustained Clinical Recovery | 13.3 (6.26 to 21) | 12.4 (7.18 to 21) |
Analysis of proportions of subjects with progression to severe COVID-19 illness defined as subject-reported shortness of breath at rest and blood oxygen saturation ≤93% on room air
| proportion of subjects | Nitazoxanide | Placebo |
|---|---|---|
| Proportion of Subjects Progressing to Severe COVID-19 | 0.005 | 0.036 |
| proportion of subjects | Nitazoxanide | Placebo |
|---|---|---|
| Day 4 | 0.908 | 0.862 |
| Day 10 | 0.707 | 0.662 |
| log10 RNA copies/milliliter | Nitazoxanide | Placebo |
|---|---|---|
| Day 4 | -0.70 ± 0.118 | -1.02 ± 0.126 |
| Day 10 | -2.49 ± 0.119 | -2.61 ± 0.120 |
Analysis of proportions of subjects requiring hospitalization for any reason during the study period
| proportion of subjects | Nitazoxanide | Placebo |
|---|---|---|
| Proportion of Subjects Requiring Hospitalization | 0.005 | 0.026 |
Analysis of proportions experiencing mortality from any cause during the study period
| proportion of subjects | Nitazoxanide | Placebo |
|---|---|---|
| All-Cause Mortality | 0.005 | 0.000 |
Time to Sustained Clinical Recovery is the time in days from the first dose of study medication to the first time at which the subject reports a decrease in total FLU-PRO score from the previous diary with assessment that symptoms are at least "somewhat better than yesterday", no oral temperature ≥100.4 F in the prior 24 hours, and no future increase in any of the FLU-PRO domains except within validated background levels.
| days | Nitazoxanide | Placebo |
|---|---|---|
| Time to Sustained Recovery for Subjects With Mild Illness | 10.3 (6.2 to 21) | 13.4 (7.4 to 21) |
Subjects completed a diary daily in the evening. The time from first dose to ability to return to usual health is the time in days from the first dose of study medication to the first time when the subject answered "Have you returned to your usual health?" with "yes" for two consecutive daily diary periods.
| days | Nitazoxanide | Placebo |
|---|---|---|
| Time to Return to Usual Health for Subjects With Mild Illness | 13.2 (9.2 to 21) | 18.4 (11.4 to 21) |
Analysis of proportions of subjects with progression to severe COVID-19 illness defined as subject-reported shortness of breath at rest and blood oxygen saturation ≤93% on room air for the subgroup of subjects considered possibly at high risk per CDC guidelines
| proportion of subjects | Nitazoxanide | Placebo |
|---|---|---|
| Progression to Severe COVID-19 for Subjects At Least Possibly At Increased Risk Per CDC Guidelines | 0.009 | 0.056 |
Analysis of proportions of subjects with progression to severe COVID-19 illness defined as subject-reported shortness of breath at rest and blood oxygen saturation ≤93% on room air for the subgroup of subjects considered high risk per CDC guidelines
| proportion of subjects | Nitazoxanide | Placebo |
|---|---|---|
| Progression to Severe COVID-19 for Subjects At Increased Risk Per CDC Guidelines | 0.009 | 0.057 |
Analysis of proportions of subjects with progression to severe COVID-19 illness defined as subject-reported shortness of breath at rest and blood oxygen saturation ≤93% on room air for the subgroup of subjects considered at high risk per FDA guidelines
| proportion of subjects | Nitazoxanide | Placebo |
|---|---|---|
| Progression to Severe COVID-19 in Subjects at High Risk by FDA Guidelines | 0.016 | 0.086 |
Collected over 28 days. Non-serious events are listed at a 2% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| Nitazoxanide | 2/472 (0.4%) | 2/472 (0.4%) | 16/472 (3.4%) |
| Placebo | 0/463 (0%) | 7/463 (1.5%) | 10/463 (2.2%) |
| Event | Nitazoxanide | Placebo |
|---|---|---|
| COVID-19 pneumoniaInfections and infestations | 1/472 | 3/463 |
| AscitesGastrointestinal disorders | 0/472 | 1/463 |
| COVID-19Infections and infestations | 0/472 | 1/463 |
| DiverticulitisInfections and infestations | 0/472 | 1/463 |
| SyncopeNervous system disorders | 0/472 | 1/463 |
| AspirationRespiratory, thoracic and mediastinal disorders | 1/472 | 0/463 |
| Event | Nitazoxanide | Placebo |
|---|---|---|
| DiarrhoeaGastrointestinal disorders | 16/472 | 10/463 |
| Age, Continuous(years) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| Mean | 40.2 ± 14.83 | 40.7 ± 14.68 | 40.5 ± 14.75 |
| Sex: Female, Male(Participants) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| Female | 282 | 284 | 566 |
| Male | 190 | 179 | 369 |
| Ethnicity (NIH/OMB)(Participants) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| Hispanic or Latino | 117 | 112 | 229 |
| Not Hispanic or Latino | 349 | 343 | 692 |
| Unknown or Not Reported | 6 | 8 | 14 |
| Race (NIH/OMB)(Participants) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| American Indian or Alaska Native | 1 | 0 | 1 |
| Asian | 5 | 7 | 12 |
| Native Hawaiian or Other Pacific Islander | 6 | 5 | 11 |
| Black or African American | 41 | 43 | 84 |
| White | 404 | 388 | 792 |
| More than one race | 1 | 1 | 2 |
| Unknown or Not Reported | 14 | 19 | 33 |
| Height(centimeters) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| Mean | 169.1 ± 10.84 | 168.4 ± 9.96 | 168.7 ± 10.41 |
| Weight(kilograms) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| Mean | 88.0 ± 24.44 | 88.5 ± 23.36 | 88.3 ± 23.90 |
| BMI(kilograms per meters squared) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| Mean | 30.7 ± 7.72 | 31.1 ± 7.51 | 30.9 ± 7.62 |
| Time from Onset of Symptoms to Randomization(hours) | Nitazoxanide | Placebo | Total |
|---|---|---|---|
| Mean | 41.5 ± 15.73 | 41.9 ± 16.71 | 41.7 ± 16.21 |
3 further baseline measures are reported on the registry.
PDFs hosted by the registry, ClinicalTrials.gov.
Ran from Aug 2020 to primary completion in Feb 2021, 5 months.
Results were first posted in Mar 2024, 3 years 1 month after primary completion. A results delay was requested in Feb 2022.
Of 168 industry-sponsored phase 3 interventional studies under COVID-19, half reached primary completion within 8 months of starting (the median), counting those still running; a quarter within 4 and three quarters within 16. This study's 5 months is below that.
Counting every sponsor, half of 453 studies reached it within 9 months; a quarter within 4 and three quarters within 17.
How these figures are worked out, and which studies are left out of them.
This study is completed, as verified in Mar 2024. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
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Studies of the drug tested here: Nitazoxanide