Clinical trial Recruiting at 1 site Phase 3 Interventional Ages 18 to 59

Adapted antibiotic treatment for Hurley stage 2 hidradenitis suppurativa

Official title: A Multicentric Randomized Double-Blind Phase 3 Trial Evaluating the Efficacy of an Adapted Antibiotherapy in Hurley Stage 2 Active Hidradenitis Suppurativa Patients Versus Tetracycline Derivative

Run by Institut Pasteur · NCT05821478 · Data updated 2026-11-12

This trial tests whether a tailored sequence of antibiotics works better than 12 weeks of lymecycline for adults under 60 with active Hurley stage 2 hidradenitis suppurativa.

More Hidradenitis Suppurativa trials

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years to 59 Years
SexAll
Enrollment92 (estimated)
SponsorInstitut Pasteur
Industry-sponsored
Locations4 sites (Marseille and 3 other locations)
StatusRecruiting
StartedMay 22, 2025
Main results expectedFebruary 28, 2027
Study endsFebruary 27, 2028
Registry record updatedJuly 9, 2025
Trial IDNCT05821478 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults under 60 with active Hurley stage 2 hidradenitis suppurativa of at least one year and ≥4 flares in the previous year, BMI <35, and coverage by the French health system.

Probably not a fit

Patients unlikely to benefit include those with Hurley stage 1 or 3 disease, age 60 or older, BMI ≥35, pregnant people or those unable to use required contraception, or individuals whose disease is driven primarily by nonbacterial inflammatory mechanisms or fixed scarring.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

The trial randomizes adults with active Hurley stage 2 hidradenitis suppurativa to an experimental, sequenced antibiotic regimen targeted at pathobionts identified in HS lesions versus a control arm receiving 12 weeks of lymecycline, with double-blind treatment through week 12. The experimental arm receives an initial 3-week ceftriaxone + metronidazole course, then 3 weeks of rifampicin + moxifloxacin + metronidazole, followed by 6 weeks of rifampin + moxifloxacin; the control arm receives lymecycline for 12 weeks. After week 12 all participants transition to standard-of-care maintenance antibiotics per French dermatology guidelines, decided by the investigator. Key inclusion criteria include age under 60, Hurley stage 2 disease, at least 1 year of disease and ≥4 flares in the prior year, BMI <35, and French health insurance coverage.

Why it matters

Potential benefit: If successful, the targeted antibiotic sequence could clear lesions faster and extend relapse-free periods compared with standard lymecycline.

How similar studies have gone: Tetracyclines are a standard treatment with modest benefits and some small studies have shown partial success with multi-drug antibiotic combinations, but this specific pathobiont-targeted sequenced approach is relatively novel.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Adults \< 60 years old
* Diagnosis of HS according to European Dermatology guidelines:

  * Recurrent inflammation occurring more than 2 times in the past 6 months in the inverse regions of the body, presenting with nodules, sinus-tracts and/or scarring.
  * Signs: Involvement of axilla, genitofemoral area, perineum, gluteal area (and infra-mammary areafor women). Presence of nodules (inflamed or noninflamed), sinus tracts (inflamed or noninflamed), abscesses, scarring (atrophic, mesh-like, red, hypertrophic or linear)
* Active HS with i) ≥ 1 year of evolution and ii) ≥ 4 flares during the previous year
* Clinical severity of HS at inclusion: Hurley stage 2
* BMI \< 35
* Written informed consent from patient
* Patient able to complete DLQI
* Patients affiliated to the French health system (Assurance Maladie), except French state medical aid beneficiaries (Aide Médicale d'Etat)
* Active compatible contraception for men and women of childbearing or inability to procreate
* Available laboratory blood test performed within the last 2-months

Non inclusion Criteria:

* Person \< 18 and ≥ 60 years old
* Former stage 3 HS
* Previous use of the experimental treatment
* Unauthorized drugs for the study during the month preceding the inclusion
* Any contra-indication to study treatments or excipient (e.g. lactose, cornstarch, riboflavin notably):

pregnancy, breastfeeding, known allergy to experimental or reference drugs, wheat allergy, tendinopathy, QT prolongation, bradycardia, heart failure, heart rhythm disturbances, hydroelectrolytic disorders, hypokalemia, coagulation disorders, severe liver/kidney dysfunction, porphyria, mandatory use of nonsteroidal anti-inflammatory drugs (NSAIDs) for other medical conditions

* Unbalanced diabetes (ie HbA1c above 7%)
* Dysphagia, untreated gastro-oesophageal reflux/ulcer
* BMI ≥ 35
* Immune suppression, inflammatory disease, including gastroenterologic and rheumatologic inflammatory conditions
* Lactase deficiency, lactose and galactose intolerance
* Malabsorption syndrome
* Person living in the same household as another patient
* Person under guardianship or curatorship
* Individuals with any condition which, in the opinion of the investigator, might interfere with the evaluation of the study objectives (e.g patient unable to complete DLQI, or poor predictable observance
* Participation in another interventional research on health products studies
* Patients requiring repeated (more than 3/year) use of antibiotics for a chronic disease other than HS
* Alcohol-dependant patients defined as an addiction to alcohol with a negative impact on health, social or personal life

Exclusion criteria:

Pregnancy QT prolongation Abnormal result of routine lab tests corresponding to contra-indication to study treatments Unauthorized drug for the study during all the study (from study treatments interactions listed in the SmPC, Cf. unauthorized drug listed in non-inclusion criteria).

Development of hypersensitivity to any of the study products and/or excipients (e.g. lactose, corn starch, riboflavin).

Where it's running

  • Centre Médical de l'Institut Pasteur
    Paris, France
    Recruiting
  • Hôpital de la Timone
    Marseille, France
    Not yet recruiting
  • Hopital St Joseph
    Paris, France
    Active not recruiting
  • CHU de Rouen
    Rouen, France
    Not yet recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.