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Cellulitis Optimal Antibiotic Treatment (COAT)

Primary Purpose

Cellulitis of Leg

Status
Not yet recruiting
Phase
Phase 3
Locations
Study Type
Interventional
Intervention
Flucloxacillin Only Product in Oral Dose Form
Placebo Only Product in Oral Dose Form
Sponsored by
University of Southampton
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional treatment trial for Cellulitis of Leg focused on measuring Primary care, Antibiotic treatment, Antibiotic resistance, Pain, Cost consequences

Eligibility Criteria

18 Years - undefined (Adult, Older Adult)All SexesDoes not accept healthy volunteers

Inclusion Criteria:

  • Must be aged 18 years or older
  • Currently showing symptoms of cellulitis (such as pain, tenderness, redness, other change in skin color, warmth to touch) in one leg for 10 days or less
  • Pain rated as 3/10 or higher on a numerical rating scale (0-10) at baseline assessment
  • Be willing to be randomized to either trial arm (5-day or 7-day treatment)
  • Able to complete trial procedures in the English language.

Exclusion Criteria:

  • Have penicillin allergy
  • Have bilateral cellulitis
  • Have had antibiotics for cellulitis within the past month
  • Have post-operative cellulitis (within 30 days of operative procedures on the same leg)
  • Have cellulitis resulting from human/animal bite injury
  • Have Cellulitis associated with chronic (>6 weeks) leg ulceration
  • Require immediate hospital admission or out-patient intravenous antibiotic therapy

Sites / Locations

    Arms of the Study

    Arm 1

    Arm 2

    Arm Type

    Placebo Comparator

    Active Comparator

    Arm Label

    Intervention

    Control

    Arm Description

    Flucloxacillin 500mg four times a day (QDS) for 5 days (unblinded NHS prescription) followed by blinded placebo QDS for 2 days (5 days of antibiotic)

    Flucloxacillin 500mg QDS for 5 days (unblinded NHS prescription) followed by flucloxacillin 500mg QDS (blinded) for 2 days (7 days of antibiotic)

    Outcomes

    Primary Outcome Measures

    Pain assessment
    Self-reported pain (measured using the Pain Numeric Rating Scale (0-10))

    Secondary Outcome Measures

    Use of additional antibiotics
    Any reported use of antibiotics other than the initial 5 days of flucloxacillin and 2 days of IMP)
    Patient-reported assessment of how well they are feeling
    Numeric rating scale NRS (0-10) and assessed as repeated measures
    Health related quality of life
    EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
    Health related quality of life used to estimate Quality Adjusted- Life Years (QALYs)
    EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
    Leg swelling and warmth
    Participant reported questionnaire
    Time until self-reported recovery
    Participant reported questionnaire
    Time until self-assessed extent of cellulitis starts to reduce (with no subsequent increase)
    Participant reported questionnaire
    Hospital admissions
    Number of hosptial admissions since randomisation, collected from primary care notes review
    Recurrent cellulitis episodes over 12 months (number of episodes)
    Recurrent cellulitis episodes over 12 months (number of episodes) since randomisation, collected from primary care notes review
    Complications over 12 months
    Number of reported complications since randomisation, collected from primary care notes review

    Full Information

    First Posted
    September 7, 2022
    Last Updated
    May 12, 2023
    Sponsor
    University of Southampton
    Collaborators
    University of East Anglia, University of Nottingham, Norfolk and Norwich University Hospitals NHS Foundation Trust, University Hospital Southampton NHS Foundation Trust
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    1. Study Identification

    Unique Protocol Identification Number
    NCT05584007
    Brief Title
    Cellulitis Optimal Antibiotic Treatment
    Acronym
    COAT
    Official Title
    A Blinded, Non-inferiority Phase III Trial of 5 Versus 7 Days of Oral Flucloxacillin in Primary Care Patients With Lower Limb Cellulitis
    Study Type
    Interventional

    2. Study Status

    Record Verification Date
    May 2023
    Overall Recruitment Status
    Not yet recruiting
    Study Start Date
    June 1, 2023 (Anticipated)
    Primary Completion Date
    November 1, 2024 (Anticipated)
    Study Completion Date
    December 1, 2025 (Anticipated)

    3. Sponsor/Collaborators

    Responsible Party, by Official Title
    Sponsor
    Name of the Sponsor
    University of Southampton
    Collaborators
    University of East Anglia, University of Nottingham, Norfolk and Norwich University Hospitals NHS Foundation Trust, University Hospital Southampton NHS Foundation Trust

    4. Oversight

    Studies a U.S. FDA-regulated Drug Product
    No
    Studies a U.S. FDA-regulated Device Product
    No
    Product Manufactured in and Exported from the U.S.
    No
    Data Monitoring Committee
    Yes

    5. Study Description

    Brief Summary
    To determine whether a short course of oral flucloxacillin (5 days) is non-inferior to a standard course (7 days) in terms of pain over days 6-14 (indicative of persistence or recurrence associated with the symptoms of most importance to patients) in adults with cellulitis of the leg presenting in primary care.
    Detailed Description
    Cellulitis is a deep infection of the skin and subcutaneous tissues and most often occurs in the legs. It is a painful condition that is associated with inflammation and swelling of the site, and often systemic symptoms such as fever, headache, muscle aches, malaise, and fatigue. Patients report feeling unwell and that it has a significant impact on their mobility and ability to carry out their usual activities. NICE guidelines recommend oral flucloxacillin 500-1000 mg four times daily for 5-7 days as first-line treatment for most patients with cellulitis in the community, but most prescriptions are dispensed for a 7-day course. We will be assessing the effectiveness and safety of a 5-day treatment vs. the standard 7-day treatment. We also aim to evaluate the cost-consequences of a shorter course from an NHS and personal perspective. Participants will be randomly allocated to one of two groups. In addition to usual care, participants will either be assigned to a 5-day oral flucloxacillin course or a standard 7-day flucloxacillin course. Participants will be prescribed a 5-day course of oral flucloxacillin, and two additional tablets will be posted to the participants which will either be the antibiotic or a placebo tablet. Participants will be asked to fill out daily questionnaires and express their experiences with the shortened course and taking part in the trial.

    6. Conditions and Keywords

    Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
    Cellulitis of Leg
    Keywords
    Primary care, Antibiotic treatment, Antibiotic resistance, Pain, Cost consequences

    7. Study Design

    Primary Purpose
    Treatment
    Study Phase
    Phase 3
    Interventional Study Model
    Parallel Assignment
    Model Description
    A phase III blinded, multi-center, non-inferiority trial assessing the effectiveness and safety of 5 days vs 7 days of oral flucloxacillin 500mg QDS for lower leg cellulitis, and to evaluate the cost-consequences of a shorter course from an NHS and personal perspective. Participants will be recruited in NHS primary care settings in England and Wales. We will primarily recruit through general practices but will explore the possibility of recruiting through out-of-the-hours and urgent care settings.
    Masking
    ParticipantCare ProviderInvestigatorOutcomes Assessor
    Masking Description
    To facilitate ease of recruitment and avoid treatment delay, participants will be provided with an NHS prescription for flucloxacillin 500mg QDS for the first 5 days. A blinded medication pack will be sent by next day delivery, containing flucloxacillin 500mg QDS, or matched placebo QDS for the final 2 days. Participants will be informed that the capsules in this pack may look different from the capsules they were taking on days 1-5. Participants experiencing significant clinical deterioration, as judged by their clinician, may have their antibiotic treatment changed or be prescribed additional antibiotic courses. Any changes or additional use of antibiotics will be recorded, and the patient and clinician will remain blinded unless unblinding is deemed necessary.
    Allocation
    Randomized
    Enrollment
    356 (Anticipated)

    8. Arms, Groups, and Interventions

    Arm Title
    Intervention
    Arm Type
    Placebo Comparator
    Arm Description
    Flucloxacillin 500mg four times a day (QDS) for 5 days (unblinded NHS prescription) followed by blinded placebo QDS for 2 days (5 days of antibiotic)
    Arm Title
    Control
    Arm Type
    Active Comparator
    Arm Description
    Flucloxacillin 500mg QDS for 5 days (unblinded NHS prescription) followed by flucloxacillin 500mg QDS (blinded) for 2 days (7 days of antibiotic)
    Intervention Type
    Drug
    Intervention Name(s)
    Flucloxacillin Only Product in Oral Dose Form
    Intervention Description
    Patients will be prescribed flucloxacillin 500mg QDS for 5 days followed by blinded flucloxacillin 500mg for 2 days, reaching a total of 7 days of antibiotic treatment
    Intervention Type
    Drug
    Intervention Name(s)
    Placebo Only Product in Oral Dose Form
    Intervention Description
    Patients will be prescribed flucloxacillin 500mg QDS for 5 days followed by a blinded placebo for 2 days, reaching a total of 5 days of antibiotic treatment
    Primary Outcome Measure Information:
    Title
    Pain assessment
    Description
    Self-reported pain (measured using the Pain Numeric Rating Scale (0-10))
    Time Frame
    Days 7-16
    Secondary Outcome Measure Information:
    Title
    Use of additional antibiotics
    Description
    Any reported use of antibiotics other than the initial 5 days of flucloxacillin and 2 days of IMP)
    Time Frame
    Up to day 28
    Title
    Patient-reported assessment of how well they are feeling
    Description
    Numeric rating scale NRS (0-10) and assessed as repeated measures
    Time Frame
    Days 6-14
    Title
    Health related quality of life
    Description
    EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
    Time Frame
    Days 6-14
    Title
    Health related quality of life used to estimate Quality Adjusted- Life Years (QALYs)
    Description
    EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
    Time Frame
    Days 6-14
    Title
    Leg swelling and warmth
    Description
    Participant reported questionnaire
    Time Frame
    Day 7, 14, 21, 28
    Title
    Time until self-reported recovery
    Description
    Participant reported questionnaire
    Time Frame
    Day 7, 14, 21, 28
    Title
    Time until self-assessed extent of cellulitis starts to reduce (with no subsequent increase)
    Description
    Participant reported questionnaire
    Time Frame
    Day 7, 14, 21, 28
    Title
    Hospital admissions
    Description
    Number of hosptial admissions since randomisation, collected from primary care notes review
    Time Frame
    12 months
    Title
    Recurrent cellulitis episodes over 12 months (number of episodes)
    Description
    Recurrent cellulitis episodes over 12 months (number of episodes) since randomisation, collected from primary care notes review
    Time Frame
    12 months
    Title
    Complications over 12 months
    Description
    Number of reported complications since randomisation, collected from primary care notes review
    Time Frame
    12 months

    10. Eligibility

    Sex
    All
    Minimum Age & Unit of Time
    18 Years
    Accepts Healthy Volunteers
    No
    Eligibility Criteria
    Inclusion Criteria: Must be aged 18 years or older Currently showing symptoms of cellulitis (such as pain, tenderness, redness, other change in skin color, warmth to touch) in one leg for 10 days or less Pain rated as 3/10 or higher on a numerical rating scale (0-10) at baseline assessment Be willing to be randomized to either trial arm (5-day or 7-day treatment) Able to complete trial procedures in the English language. Exclusion Criteria: Have penicillin allergy Have bilateral cellulitis Have had antibiotics for cellulitis within the past month Have post-operative cellulitis (within 30 days of operative procedures on the same leg) Have cellulitis resulting from human/animal bite injury Have Cellulitis associated with chronic (>6 weeks) leg ulceration Require immediate hospital admission or out-patient intravenous antibiotic therapy

    12. IPD Sharing Statement

    Plan to Share IPD
    No
    IPD Sharing Plan Description
    Data from all centers will be analyzed together and published as soon as possible. Planned publication of the results in a high-impact peer-reviewed journal. Planned publication of protocol in a peer-review journal. The datasets generated and/or analyzed during the current study will be published as a supplement to the publication of the results. Individual investigators may not publish data concerning their patients that are directly relevant to questions posed by the trial until the Trial Management Group (TMG) has published its report. The TMG will form the basis of the Writing Committee and advise on the nature of publications.

    Learn more about this trial

    Cellulitis Optimal Antibiotic Treatment

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