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Azithromycin and Chloroquine

Phase 3

Acute Bronchitis | Small molecule | Respiratory |Pfizer, Inc.|Trials Updated: May 21, 2025

Azithromycin and Chloroquine development status

Highest phase Phase 3
Registered trials 1 across 1 sponsor since Feb 2009

Azithromycin and Chloroquine target and mechanism

ModalitySmall molecule

Also known as Azithromycin, azithromycin (Zithromax), azithromycin (AZ), azithromycin SR

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials25
Total Enrollment156,489

FDA Designations

No designations recorded

Azithromycin and Chloroquine clinical trials

Azithromycin and Chloroquine · 25 trials · 22 indications

Phase 3 17Phase 2 5Phase 1 3
NCT04424511Effects of Mass Drug Administration of Azithromycin on Mortality and Other Outcomes Among 1-11 Month Old Infants in MaliMortality
COMPLETED149,201 Analytics
NCT00871494Study Of Azithromycin Intravenous Formulation Against Pelvic Inflammatory Disease (PID) In JapanPelvic Inflammatory Disease
COMPLETED76 Analytics
NCT00809328The Study Of Azithromycin Switch Therapy For Treatment Of Community Acquired Pneumonia (CAP)Community Acquired Pneumonia (CAP)
COMPLETED102 Analytics
NCT00367653Azithromycin Plus Chloroquine Versus Mefloquine In the Treatment of Uncomplicated P. Falciparum Malaria.Malaria
COMPLETED397 Analytics
NCT00393835A Trial Of Azithromycin SR For The Treatment Of Laryngopharyngitis or Tonsillitis or Acute Bacterial RhinosinusitisUpper Respiratory Tract Infection
COMPLETED99 Analytics
NCT00360464A Trial Of Azithromycin SR For The Treatment Of Acute Bronchitis And Secondary Infection Of Chronic Respiratory DiseasesAcute Bronchitis
COMPLETED64 Analytics
NCT00360295A Trial Of Azithromycin SR For The Treatment Of Mild To Moderate Community Acquired Pneumonia In Japanese AdultsPneumonia, Community-Acquired
COMPLETED153 Analytics
NCT00254566A Trial To Evaluate Two Antibiotics For The Treatment Of Acute Exacerbation Of Chronic Bronchitis (AECB)Chronic Bronchitis
COMPLETED398 Analytics
NCT00643149A Multicenter, Randomized, Double-Blind, Double-Dummy Study Of Azithromycin SR Versus Amoxicillin For The Treatment Of Strep Throat In ChildrenTonsillitis
COMPLETED693 Analytics
NCT00643227A Multicenter, Randomized, Double-Blind, Double-Dummy Trial of Azithromycin SR Compared With Clarithromycin Extended Release for the Treatment of Pneumonia in Adult PatientsPneumonia
COMPLETED504 Analytics
PHASE3COMPLETED
Effects of Mass Drug Administration of Azithromycin on Mortality and Other Outcomes Among 1-11 Month Old Infants in Mali
MortalityUnlock trial analytics
PHASE3COMPLETED
Study Of Azithromycin Intravenous Formulation Against Pelvic Inflammatory Disease (PID) In Japan
Pelvic Inflammatory DiseaseUnlock trial analytics
PHASE3COMPLETED
The Study Of Azithromycin Switch Therapy For Treatment Of Community Acquired Pneumonia (CAP)
Community Acquired Pneumonia (CAP)Unlock trial analytics
PHASE3COMPLETED
Azithromycin Plus Chloroquine Versus Mefloquine In the Treatment of Uncomplicated P. Falciparum Malaria.
MalariaUnlock trial analytics
PHASE3COMPLETED
A Trial Of Azithromycin SR For The Treatment Of Laryngopharyngitis or Tonsillitis or Acute Bacterial Rhinosinusitis
Upper Respiratory Tract InfectionUnlock trial analytics
PHASE3COMPLETED
A Trial Of Azithromycin SR For The Treatment Of Acute Bronchitis And Secondary Infection Of Chronic Respiratory Diseases
Acute BronchitisUnlock trial analytics
PHASE3COMPLETED
A Trial Of Azithromycin SR For The Treatment Of Mild To Moderate Community Acquired Pneumonia In Japanese Adults
Pneumonia, Community-AcquiredUnlock trial analytics
PHASE3COMPLETED
A Trial To Evaluate Two Antibiotics For The Treatment Of Acute Exacerbation Of Chronic Bronchitis (AECB)
Chronic BronchitisUnlock trial analytics
PHASE3COMPLETED
A Multicenter, Randomized, Double-Blind, Double-Dummy Study Of Azithromycin SR Versus Amoxicillin For The Treatment Of Strep Throat In Children
TonsillitisUnlock trial analytics
PHASE3COMPLETED
A Multicenter, Randomized, Double-Blind, Double-Dummy Trial of Azithromycin SR Compared With Clarithromycin Extended Release for the Treatment of Pneumonia in Adult Patients
PneumoniaUnlock trial analytics

Study Endpoints

Primary Endpoints

Mortality
3-month time interval (total of 8 intervals per cluster)

Mortality rate (deaths per 1,000 years at risk) among children 1-11 months of age.

Response Rate (Clinical Response, Data Review Committee Assessment) in Participants Who Enrolled After Protocol Amendment (the Inclusion Criterion Regarding Fever of 37℃ or Higher Was Option)
End of Treatment, Day 15 and Day 29

Response rate was calculated from the following formula, "the number of participants assessed as effective" over "total participants excluding ones assessed as indeterminate" multiplied by 100. The inclusion criterion regarding fever was amended from the required criteria to the additional criteria in consultation with the regulatory authority. The subset of participants who were enrolled after the protocol amendment was the primary analysis sets for efficacy.

Response Rate (Clinical Response, Data Review Committee Assessment)
End of Treatment, Day 15 and Day 29

Response rate was calculated from the following formula, "the number of participants assessed as effective" over "total participants excluding ones assessed as indeterminate" multiplied by 100.

The primary objective is to confirm the hypothesis that azithromycin plus chloroquine is noninferior to mefloquine for the treatment of symptomatic, uncomplicated malaria due to P. falciparum in Africa.
duration of trial
The primary endpoint of the study will be the asexual P. falciparum Parasite Clearance Rates (adjusted for molecular testing determining recrudescence, true failures, from reinfection, true cures) at Day 28 in the Parasitologic Per Protocol population.
duration of trial
The primary endpoint is Investigator's Clinical efficacy at Day 8.
The primary endpoint is Data Review Committee's Clinical efficacy at Day 8.
Percentage of Clinical Cure (Success) at Test of Cure Visit(Clinical Per Protocol Population)
Test of Cure (TOC) Visit (Day 12-19)

Cure=Signs\&symptoms(S\&S) of infection return to normal baseline level or clin improvement requiring no other antibiotics(AB); Failure=other AB due to S\&S of acute infection persisted/worsened,new clinical S\&S of acute infection,or clinical/radiological evidence of pneumonia developed during treatment; percent = # of cure or failure/total # of sub

Bacteriologic response (eradication or persistence) at the Test of Cure (TOC) visit in the Bacteriologic Per Protocol population
TOC visit (Day 24-28)
sponsor assessment of clinical response (clinical cure rate) in the Clinical Per Protocol population
Test of Cure (TOC) visit (Day 14-21)
sponsor assessment of clinical response in the Clinical Per Protocol population
Test of Cure (TOC) visit (Day 14-21)
bacteriologic response in the Bacteriologic per Protocol population
Test of Cure (TOC) visit (Days 24-28)
sponsor assessment of clinical response for the Clinical per Protocol population
Test of Cure (TOC) visit (Day 17-24)
clinical response (cure or failure) in the Clinical Per Protocol population
Test of Cure (TOC) visit (Day 12-14)
To assess clinical efficacy (clinical recovery or clinical failure)
Day 30
Percentage of Participants With Polymerase Chain Reaction (PCR)-Corrected Adequate Clinical and Parasitologic Response (ACPR) at Day 28 in the Modified Intent-to-treat (mITT) Population
Day 28

ACPR (PCR-corrected) was defined as asexual Plasmodium falciparum (P.falciparum) parasitologic clearance at Day 28 irrespective of axillary, oral, rectal, or tympanic temperature, without previously meeting the criteria of Early Treatment Failure (ETF) (see measure description in secondary outcome measures 7 and 8) or PCR-corrected Late Treatment Failure (LTF) (which includes PCR-corrected Late Clinical Failures \[LCF\] - see measure description in secondary outcome measure 9 and 10, and PCR-corrected Late Parasitologic Failures (LPF)- see measure description in secondary outcome measure 11 and 12). PCR-corrected refers to the use of molecular testing to differentiate recrudescence from reinfection in the context of an efficacy evaluation.

Percentage of Participants With PCR-corrected ACPR at Day 28 in Per-Protocol (PP) Population
Day 28

ACPR (PCR-corrected) was defined as asexual P.falciparum parasitologic clearance at Day 28 irrespective of axillary, oral, rectal, or tympanic temperature, without previously meeting the criteria of ETF (see measure description in secondary outcome measures 7 and 8) or PCR-corrected LTF (which includes PCR-corrected LCF - see measure description in secondary outcome measure 9 and 10, and PCR-corrected LPF - see measure description in secondary outcome measure 11 and 12). PCR-corrected refers to the use of molecular testing to differentiate recrudescence from reinfection in the context of an efficacy evaluation.

Percentage of Participants With Parasite Clearance at Day 28
Day 28

Parasite clearance was defined as the clearance of asexual Plasmodium falciparum (P falciparum) parasitemia (defined as three consecutive 0 parasite counts) within 7 days of initiation of treatment, without subsequent recrudescence up to Day 28. Failure to achieve clearance of asexual P falciparum parasitemia was defined as parasitemia not cleared within 7 days of initiation of treatment, or subsequent recrudescence (confirmed by molecular testing) by Day 28 after achieving clearance. Percentage of participants with clearance is reported. Here "N" (Number of participants analyzed) signify participants who were evaluable (parasitological per protocol) at Day 28.

parasite clearance

Secondary Endpoints

Morbidity
3-month time interval (total of 8 intervals per cluster)
Length-for-age Z-score
3-month time interval (total of 3 intervals per cluster)
Length
3-month time interval (total of 3 intervals per cluster)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ControlPLACEBO_COMPARATORPlacebo mixture will be administered as a single dose in oral suspension form for children 1-11 months of age: 1. Single-dose of 0.5 ml / kg child weight 2. Participating households within villages allocated to this group will be visited quarterly (at 3-month intervals), for nine times. At the first eight of these visits, 1-11 month old eligible infants, for whom there is a consent for study drug provision, will be weighed and given a single dose of placebo mixture.
Azithromycin-biannually (Azi-biannual)ACTIVE_COMPARATORAzithromycin or placebo will be administered as a single dose in oral suspension form for children 1-11 months of age: 1. Single-dose of 0.5 ml / kg child weight 2. Participating households within villages allocated to this group will be visited quarterly (at 3-month intervals), for nine times. At the first eight of these visits, 1-11 month old eligible infants, for whom there is a consent for study drug provision, will be weighed and given a single dose of study drug. 3. Azithromycin will be given at quarterly visits between January and June, and Placebo mixture will be given at quarterly visits between July and December. Azithromycin dose will be 20 mg / kg.
Azithromycin-quarterlyACTIVE_COMPARATORAzithromycin will be administered as a single dose in oral suspension form for children 1-11 months of age: 1. Single-dose of 0.5 ml (20 mg) / kg child weight. 2. Participating households within villages allocated to this group will be visited quarterly (at 3-month intervals), for nine times. At the first eight of these visits, 1-11 month old eligible infants, for whom there is a consent for study drug provision, will be weighed and given a single dose of azithromycin.
Azithromycin switch therapy (switch from intravenous to oral).EXPERIMENTAL -
AzithromycinEXPERIMENTALAzithromycin switch therapy (switch from intravenous to oral)
1EXPERIMENTAL -
2EXPERIMENTAL -
Group 2ACTIVE_COMPARATOR -
Group 1ACTIVE_COMPARATOR -
Azithromycin plus chloroquineEXPERIMENTALSingle Arm, Open label study

Interventions

NameTypeDescription
PlaceboDRUGPlacebo mixture will be administered as a single dose in oral suspension form for children 1-11 months of age. Weight-based dosing will be used: single-dose of 0.5 ml / kg child weight.
AzithromycinDRUGAzithromycin will be administered as a single dose in oral suspension form for children 1-11 months of age. Weight-based dosing will be used: single-dose of 0.5 ml (20 mg) / kg child weight.
Azithromycin plus ChloroquineDRUGAzithromycin 1000 mg by mouth (PO) (two 500 mg tablets) once daily (QD) for 3 days(Days 0, 1, 2) plus chloroquine 600 mg base PO once daily for 3 days (Days 0, 1, 2)
MefloquineDRUGMefloquine 1250 mg PO given as a split dose (750 mg \[three 250 mg capsules\]) initial dose followed by 500 mg PO (two 250 mg capsules) given 6 to 10 hours later on Day 0
Azithromycin SRDRUG -
Moxifloxacin PlaceboOTHER1 capsule once daily for 5 days
MoxifloxacinDRUG1 X 400mg capsule once daily for 5 days
Azithromycin SR PlaceboOTHERsingle dose, oral.
amoxicillinDRUG10 day regimen, 45 mg/kg/day, given in divided doses every 12 hours
clarithromycin extended release (ER)DRUG7 days of clarithromycin extended release (ER), 1.0 g by mouth once daily
azithromycin SR (Zithromax; compound: CP-62,993)DRUGazithromycin 2.0 g by mouth in the form of a slurry for 1 dose
levofloxacinDRUG500 mg (two 250 mg capsules) by mouth once daily for 7 days
azithromycin (Zithromax)DRUGazithromycin 500 mg tablet by mouth once daily for 3 days
amoxicillin/clavulanate postassium (Augmentin ES-600)DRUGamoxicillin/clavulanate postassium 90/6.4 mg/kg/day, given in divided doses q12h, for 10 days
Amoxicillin/clavulinic acidDRUGamoxicillin/clavulinic acid 500 mg/62.5 mg tablet; take 2 tablets by mouth twice daily (BID) for 10 days
Ethambutol hydrochlorideDRUG -
ClarithromycinDRUG -
RifabutinDRUG -
FluconazoleDRUG -
Artemether-lumefantrineDRUGArtemether-lumefantrine tablet(s) based on weight and labeling for 3 days (Days 0, 1, 2)
Azithromycin/ChloroquineDRUG -
Atovaquone/ProguanilDRUG -
Sulfadoxine-Pyrimethamine/ChloroquineDRUG -
PyrimethamineDRUG -
Leucovorin calciumDRUG -
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Eligibility Criteria

Age Range29 Days to 364 Days
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: On a cluster (village) level: 1. Location within Kayes, Kita, or Koulikoro region of Mali 2. Considered accessible and safe by the local health authorities and research team 3. Considered non-urban by the local health authorities and research team 4. Permission from community l...

Countries:MaliJapanBurkina FasoGhanaKenyaSenegalZambiaChinaMalaysiaPhilippinesSingaporeTaiwanThailandUnited StatesCanadaCosta RicaGuatemalaIndiaArgentinaEstoniaLithuaniaRussiaBrazilGermanyMexicoNetherlandsSpainUnited KingdomVenezuelaBelgiumFinlandFranceItalyNorwayChileCzechiaPolandSlovakiaDominican RepublicIsraelPanamaCôte d’IvoireColombiaUganda
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Frequently asked questions about Azithromycin and Chloroquine

What is azithromycin and chloroquine used for?

Azithromycin and chloroquine is a combination treatment studied for uncomplicated Plasmodium falciparum malaria. Azithromycin is also studied across bacterial infections including acute bronchitis, acute otitis media, chronic bronchitis, and community acquired pneumonia. The combination pairs azithromycin with chloroquine specifically for malaria.

Who makes azithromycin and chloroquine?

Pfizer, Inc. (ticker PFE) is the developer of azithromycin and chloroquine. Pfizer is also the sponsor behind the azithromycin clinical program, including the combination trial of azithromycin plus chloroquine in children with uncomplicated P. falciparum malaria in Africa.

What phase is azithromycin and chloroquine in?

The azithromycin plus chloroquine combination has been studied in Phase 2 for uncomplicated P. falciparum malaria. Azithromycin itself has been studied in Phase 3 trials across several indications. The combination is investigational and is not approved for malaria treatment.

What clinical trials is azithromycin and chloroquine in?

The combination was evaluated in NCT00677833, a Phase 2 trial comparing azithromycin plus chloroquine with artemether-lumefantrine for uncomplicated P. falciparum malaria in children across Burkina Faso, Cote d'Ivoire, Ghana, Kenya, and Mali. That trial is completed. Azithromycin has also been studied in Phase 3 trials including NCT04424511, NCT00871494, and NCT00809328.

Is azithromycin and chloroquine the same as Zithromax?

No. Azithromycin and chloroquine is a combination of two drugs, while Zithromax is a brand name for azithromycin alone. Azithromycin is also known as AZ, azithromycin SR, and by the compound designation CP-62,993. The combination is distinct from azithromycin monotherapy.

What is azithromycin?

Azithromycin is a small molecule antibiotic developed by Pfizer, Inc. (ticker PFE). It has been studied in Phase 3 trials for acute bronchitis, acute otitis media, chronic bronchitis, community acquired pneumonia, pelvic inflammatory disease, and other bacterial infections, and in combination with chloroquine for falciparum malaria.