for people ages 18 years and up (full criteria)
at San Diego, California and other locations
study started
estimated completion



Rosacea is a common chronic inflammatory relapsing-remitting skin condition almost exclusively affecting the central area of the face and the eyes.

Preliminary evidence suggests that treatment with rifaximin, a poorly absorbed oral antibiotic drug may be beneficial in patients with rosacea, particularly in those with papulopustular phenotype and positivity to Lactulose Breath Test (L-BT).

The objective of this study is twofold:

  1. To explore the safety and efficacy of 2 doses of oral Rifaximin versus placebo in adults with moderate-to-severe papulopustular rosacea.
  2. To assess the pharmacokinetics (PK) of these two dose regimens in a sub-group of patients.

Official Title

A Phase IIa, Multicenter, Double Blind, Placebo Controlled, Randomized Clinical Trial to Assess Safety, Efficacy and Pharmacokinetics of Rifaximin Delayed-Release (Rifaximin-EIR) in Patients With Moderate-to-severe Papulopustular Rosacea


Papulopustular Rosacea, Rosacea, Rifaximin


You can join if…

Open to people ages 18 years and up

  • Men and women aged 18 years or older at screening (V1)
  • Female participants are eligible if they are: i) of non-childbearing potential or ii) of childbearing potential with a negative pregnancy test result at screening and randomization AND agreeing to use a highly effective method of contraception until 72 hours after taking the last study treatment dose.
  • Presence of rosacea, papulopustular phenotype.
  • Moderate or severe rosacea based on Investigator's Global Assessment based on Investigator's judgement.
  • Patients accepting to provide and legally capable of providing free and informed consent to all procedures included in the protocol (including the availability to perform a Lactulose Breath Test).

You CAN'T join if...

  • Granulomatous rosacea or rosacea fulminans.
  • Hypersensitivity or intolerance to lactulose or any excipient of the lactulose preparation to be used for L-BT.
  • History of inflammatory bowel disease (Crohn's disease or ulcerative colitis) or other conditions characterized by severe intestinal ulcers.
  • Patients with intestinal obstruction or partial intestinal obstruction.
  • Severe kidney impairment (i.e. estimated glomerular filtration rate <30 ml/min).
  • Severe hepatic impairment (i.e. Child-Pugh B or C).
  • Cancer or any cancer-related treatment within 5 years prior to screening (excluding non-melanoma skin-cancer).
  • History of alcohol or drug abuse within a year prior to screening, based on Investigator's judgement.
  • Facial skin conditions that can interfere with reliable assessment of rosacea throughout the study (e.g. facial hair, tattoos, other facial adornments, keloids, hypertrophic scarring, recent facial surgery, excessive sun exposure including use of tanning beds)
  • Any other significant health condition (e.g. cardiovascular, respiratory, renal, hepatic, neurologic, psychiatric, hematologic, oncologic, immune etc.) or non-health condition that in the investigator's judgement may: i) jeopardize the patient's safe participation in the trial or ii) make unlikely the patient's completion of the study or iii) make unlikely the patient's compliance with the study procedures (e.g. highly anticipated need of non-permitted treatments, terminal illness, etc.).
  • History of hypersensitivity to the study drug.
  • Treatment with biologic immunomodulatory and/or immunosuppressive drugs (e.g. anti-TNF drugs) within 6 months prior to randomization.
  • Treatment with non-biologic immunomodulatory and/or immunosuppressive drugs (e.g. cyclosporine, methotrexate etc.) within 30 days prior to randomization.
  • Treatment with warfarin (or other coumarins) within 14 days prior to randomization.
  • Treatment with niacin within 30 days prior to randomization.
  • Topical facial or systemic antibiotics within 30 days before randomization;
  • Treatment with neomycin or other low-absorbable oral antibiotics within 90 days before randomization.
  • Topical facial, inhaled or systemic corticosteroids within 30 days prior to randomization.
  • Topical facial retinoids within 30 days before randomization.
  • Systemic retinoids within 6 months before randomization.
  • Any other topical or systemic treatment for rosacea within 30 days before randomization (including also laser and pulsed light, etc.).
  • Over-the-counter intestinal or topical skin probiotics (functional food is allowed), within 30 days before randomization.
  • Any experimental treatment within 6 months prior to randomization.
  • Current swab-positive or suspected (under investigation) Covid-19 infection; or fever and one or more of the following respiratory disease signs or symptoms: cough, sputum production, shortness of breath within the last 14 days; or contact with people with Covid-19 infection within the last 14 days.
  • Women who are pregnant, breast-feeding or planning a pregnancy during the trial period.
  • Subjects who are investigational site staff members and their family members, site staff members otherwise supervised by the investigator, or patients who are Alfasigma's employees.


  • UCSD
    San Diego California 92122 United States
  • Cosmetic Laser Dermatology
    San Diego California 92121 United States
  • University Clinical Trials, Inc.
    San Diego California 92123 United States


in progress, not accepting new patients
Start Date
Completion Date
Alfasigma S.p.A.
Phase 2 research study
Study Type
About 216 people participating
Last Updated