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Could a lower dose of antibiotics be safer and just as effective for this lung infection?

NCT ID NCT04851015

Disease control Sponsor: Todd C. Lee MD MPH FIDSA Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study is for people with a weakened immune system who have a serious lung infection called PCP. The standard treatment often causes bad side effects. Researchers want to see if a lower dose of the antibiotic TMP-SMX works just as well but with fewer side effects. About 416 adults will take part, and the study will compare the lower dose to the standard dose.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 3

Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.

Participants

About 416 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2025

Expected to finish

Dec 2030

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 100 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * 18 years or older * Immunocompromised (including but not limited to HIV, solid organ transplant, solid tumors, hematological stem cell transplant and malignancies, systemic diseases, chemotherapy, long term corticosteroid use, and immunosuppressive therapies, as well as primary immunodeficiencies * Presentation to a day hospital, emergency department, or admitted to hospital * Proven or probable diagnosis of PCP using an adapted version of the 2021 EORTC/MSGERC criteria. Exclusion Criteria: * Previous severe adverse reaction to TMP-SMX, any sulfa drug, or any component of formulation * Compliant with PCP prophylaxis for ≥4 weeks with TMP-SMX at enrollment * More than 96 hours of any therapy for PCP * Hepatic impairment marked by alanine aminotransferase levels ≥5 times the upper limit of normal * Known G6PD deficiency * Known diagnosis of porphyria * Known pregnancy or breastfeeding (as per Health Canada) * Unable to provide informed consent and no available healthcare proxy (with ethics approval for deferred consent in cases of critical illness); refusal of consent; no reliable means of outpatient contact (telephone/email/text); * Previously enrolled

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Conditions

The condition(s) this trial relates to.

Infections Pneumocystis infectious disease pneumocystosis pneumonia

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Pneumocystis Pneumocystis carinii infection Pneumocystis carinii; infection, resulting from HIV disease Pneumocystis infections Pneumocystis jirovecii infection Pneumocystis pneumonia Pneumocystosis associated with AIDS Pneumocystosis; pneumonia (etiology)

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • McGill University Health Centre (Royal Victoria Hospital and Montreal General Hospital)

    RECRUITING

    Montreal, Quebec, H4A3J1, Canada

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