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Not yet recruitingNCT06817096Updated Feb 10, 2025

Efficacy and Safety of Nitazoxanide 600 Mg in the Outpatient Treatment of COVID-19 and Influenza

A Phase 3 interventional study of Nitazoxanide 600Mg Oral Tablet / placebo oral tablet in Covid 19 and Influenza, sponsored by Azidus Brasil. Not yet recruiting. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-02-10.

Sponsored by Azidus Brasil · Phase 3, Interventional, and Treatment

Phase
Phase 3
Study type
Interventional
Enrollment
340
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

  1. Participants will:
  • Take nitazoxanide 600mg (or placebo) orally twice daily for 7 days, for a total of 14 doses.
  • Visit the clinic on the 7th day of treatment for a check-up and safety tests.
  • Keep a diary of their symptoms and other medications used
02

Conditions studied

  • Covid 19
  • Influenza

Keywords

  • nitazoxanide
  • outpatient treatment
03

In context

COVID-19

7,640 studies on the registry are indexed under COVID-19; 488 are open to participants now.

This study's planned enrollment of 340 is above the median of 100 across 4,099 interventional studies indexed under COVID-19.

Browse COVID-19 studies →

Lead sponsor

Azidus Brasil is the lead sponsor of 78 studies on the registry; 5 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Signed informed consent form;
  • Male or female;
  • Age ≥ 18 years;
  • COVID-19 or influenza diagnosed by rapid test, with symptom onset less than 48 hours ago;
  • Clinical condition compatible with outpatient treatment.

Exclusion criteria

Exclusion Criteria:

  • Known hypersensitivity to nitazoxanide;
  • History of cardiomyopathies, hepatopathies, or nephropathies;
  • Antineoplastic treatment with chemotherapy or radiotherapy;
  • Severe autoimmune diseases with immunosuppression;
  • Transplant recipients;
  • Any uncompensated systemic disease at the investigator's discretion;
  • Participation in clinical studies in the last 12 months;
  • Pregnant or breastfeeding individuals;
  • Suspected bacterial coinfection or prescription of antibiotic therapy at enrollment;
  • Diagnosis of neurological disease (traumatic brain injury, stroke, Parkinson's disease, Alzheimer's disease, other dementias);
  • Diagnosis of developmental disorder (ADHD, ASD, learning disabilities, intellectual disability, Rett syndrome);
  • Significant hearing or vision impairment.
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Outcomes assessor)
Enrollment
340 participants (estimated)

Study arms

  • Placebo comparator
    placebo

    take placebo orally, twice daily for 7 days.

    Drug: Nitazoxanide 600Mg Oral Tablet / placebo oral tablet

  • Experimental
    nitazoxanide

    take nitazoxanide 600 mg orally, twice daily for 7 days

    Drug: Nitazoxanide 600Mg Oral Tablet / placebo oral tablet

Interventions

  • DrugNitazoxanide 600Mg Oral Tablet / placebo oral tablet

    1 tablet every 12 hours

06

What researchers measure

Primary outcomes

  1. Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of COVID-19

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the time to symptom resolution (fever, cough, runny nose, nasal congestion, sore throat, fatigue, headache, muscle pain, sweating, or chills) from inclusion until fever is absent and the other signs and symptoms reach a score\* of 1 or 0. \*Scores will be classified from 0 to 3, as follows: absent (0), mild (1), moderate (2), or severe (3), according to the Influenza-like Illness Signs and Symptoms Scale (ILISSS).

    Time frame: From enrollment to the end of treatment will last up to 60 days

  2. Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of Influenza

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the time to symptom resolution (fever, cough, runny nose, nasal congestion, sore throat, fatigue, headache, muscle pain, sweating, or chills) from inclusion until fever is absent and the other signs and symptoms reach a score\* of 1 or 0. \*Scores will be classified from 0 to 3, as follows: absent (0), mild (1), moderate (2), or severe (3), according to the Influenza-like Illness Signs and Symptoms Scale (ILISSS).

    Time frame: From enrollment to the end of treatment will last up to 60 days

Secondary outcomes

  1. Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of COVID-19

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the time to symptom resolution (fever, cough, runny nose, nasal congestion, sore throat, fatigue, headache, muscle pain, sweating, or chills) from inclusion until fever is absent and the other signs and symptoms reach a score\* of 1 or 0, for participants who developed symptoms less than 24 hours before inclusion.

    Time frame: From enrollment to the end of treatment will last up to 60 days

  2. Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of Influenza

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the time to symptom resolution (fever, cough, runny nose, nasal congestion, sore throat, fatigue, headache, muscle pain, sweating, or chills) from inclusion until fever is absent and the other signs and symptoms reach a score\* of 1 or 0, for participants who developed symptoms less than 24 hours before inclusion.

    Time frame: From enrollment to the end of treatment will last up to 60 days

  3. Evaluation of the Protective Effect of Nitazoxanide on the Development of Cognitive Changes Resulting from COVID-19

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding cognitive impairments observed between V6 and V8 in the following tests: 1. MoCA 2. TMT-A 3. TMT-B

    Time frame: From enrollment to the end of treatment will last up to 60 days

  4. Evaluation of the Protective Effect of Nitazoxanide on the Development of Pulmonary Dysfunction Resulting from COVID-19

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding changes in spirometric parameters observed between V6 and V8: 1. FVC 2. FEV1 3. FVC/FEV1

    Time frame: From enrollment to the end of treatment will last up to 60 days

  5. Evaluation of the Effectiveness of Nitazoxanide in Preventing Bacterial Complications

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the incidence of antibacterial medication prescriptions.

    Time frame: From enrollment to the end of treatment will last up to 60 days

  6. Evaluation of the Effectiveness of Nitazoxanide in Preventing Hospitalization

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the incidence of hospitalization.

    Time frame: From enrollment to the end of treatment will last up to 60 days

  7. Evaluation of the Safety of Nitazoxanide in Participants with COVID-19 or Influenza Under Outpatient Treatment

    The evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the incidence and classification of treatment-emergent adverse events in terms of type, frequency, and severity.v

    Time frame: From enrollment to the end of treatment will last up to 60 days

07

Study locations

No study locations are listed for this record.

08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Feb 10, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT06817096
Lead sponsor
Azidus Brasil
Collaborators
Farmoquimica S.A.
Responsible party
Sponsor
First posted
Feb 10, 2025
Start date
Feb 2025 (estimated)
Primary completion
Dec 2026 (estimated)
Completion
Jun 2027 (estimated)
Last update
Feb 10, 2025

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is not yet recruiting, as verified in Feb 2025. You cannot join it, but the record below documents what was studied.

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