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

Phase 3, Multicenter, Parallel, Randomized, Single-blind, Placebo-controlled Clinical Trial to Evaluate the Efficacy and Safety of Nitazoxanide 600 Mg Administered Twice Daily, in the Outpatient Treatment of COVID-19 and Influenza

Status
Not yet recruiting
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT06817096
Enrollment
340
Registered
2025-02-10
Start date
2025-02-28
Completion date
2027-06-30
Last updated
2025-02-10

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Covid 19, Influenza

Keywords

nitazoxanide, outpatient treatment

Brief summary

2\. 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

Interventions

DRUGNitazoxanide 600Mg Oral Tablet / placebo oral tablet

1 tablet every 12 hours

Sponsors

Farmoquimica S.A.
CollaboratorINDUSTRY
Azidus Brasil
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
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

* 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.

Design outcomes

Primary

MeasureTime frameDescription
Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of COVID-19From enrollment to the end of treatment will last up to 60 daysThe 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).
Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of InfluenzaFrom enrollment to the end of treatment will last up to 60 daysThe 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).

Secondary

MeasureTime frameDescription
Evaluation of the Protective Effect of Nitazoxanide on the Development of Cognitive Changes Resulting from COVID-19From enrollment to the end of treatment will last up to 60 daysThe 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
Evaluation of the Protective Effect of Nitazoxanide on the Development of Pulmonary Dysfunction Resulting from COVID-19From enrollment to the end of treatment will last up to 60 daysThe 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
Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of COVID-19From enrollment to the end of treatment will last up to 60 daysThe 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.
Evaluation of the Effectiveness of Nitazoxanide in Preventing HospitalizationFrom enrollment to the end of treatment will last up to 60 daysThe evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the incidence of hospitalization.
Evaluation of the Safety of Nitazoxanide in Participants with COVID-19 or Influenza Under Outpatient TreatmentFrom enrollment to the end of treatment will last up to 60 daysThe 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
Evaluation of the Effectiveness of Nitazoxanide in Preventing Bacterial ComplicationsFrom enrollment to the end of treatment will last up to 60 daysThe evaluation will be conducted by comparing the nitazoxanide and placebo groups regarding the incidence of antibacterial medication prescriptions.
Evaluation of the Effectiveness of Nitazoxanide in the Outpatient Treatment of InfluenzaFrom enrollment to the end of treatment will last up to 60 daysThe 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.

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026