RCT to Investigate if Prophylactic Antibiotics Prevent Further Episodes of Cellulitis (Erysipelas) of the Leg (PATCH1)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00552799
Recruitment Status : Completed
First Posted : November 2, 2007
Last Update Posted : July 24, 2012
Action Medical Research
UK Dermatology Clinical Trials Network
Information provided by (Responsible Party):
University of Nottingham

November 1, 2007
November 2, 2007
July 24, 2012
July 2006
November 2011   (Final data collection date for primary outcome measure)
The primary outcome is time to next episode of cellulitis [ Time Frame: variable ]
Same as current
Complete list of historical versions of study NCT00552799 on Archive Site
Secondary outcomes include: i) the proportion of participants with repeat episodes of cellulitis; ii) proportion of participants with oedema and/or ulceration; iii) cost-effectiveness; iv) predictors of response (multiple regression model). [ Time Frame: variable ]
Same as current
Not Provided
Not Provided
RCT to Investigate if Prophylactic Antibiotics Prevent Further Episodes of Cellulitis (Erysipelas) of the Leg
Randomised Controlled Trial to Investigate Whether Prophylactic Antibiotics Can Prevent Further Episodes of Cellulitis (Erysipelas) of the Leg (PATCH I)
To assess whether a period of prophylactic penicillin after an episode of cellulitis of the leg reduces the risk of repeat episodes. Participants are randomised to receive 12 months of prophylaxis (penicillin VK 250mg b.d. or placebo). The PATCH I study will recruit only patients with recurrent disease.

Cellulitis of the leg is an common, acute, painful and potentially serious infection of the skin and subcutaneous tissue. It currently accounts for 2-3% of UK hospital admissions. The average length of in-patient stay is 9 days (Hospital Episode Statistics, Department of Health (UK), 2002-2003) and 25-50% of treated patients suffer further episodes and other morbidity, such as oedema and ulceration.

Cellulitis of the lower leg is usually due to streptococcal infection that has entered into the body via a relatively subtle portal, such as toeweb fissures. Penicillin is the most useful of the commonly used oral antibiotics against streptococci, although other agents such as flucloxacillin are often used if staphylococcal infection is a clinical possibility.

There are numerous risk factors for cellulitis of the lower leg and recurrent disease is one the biggest problems.

Existing evidence for the use of prophylactic antibiotics to prevent further episodes is very limited. Two small randomised controlled trials (RCTs) hint at possible benefit, but these studies are very small (16 and 40 participants respectively). Despite this, many physicians routinely use prophylactic antibiotics for recurrent cellulitis, although opinions on the value of such practice is firmly divided.

This study will recruit over a 12-24 month period participants who have completed the therapy for the current episode of cellulitis. Participants will be followed up for up to 24 months with telephone calls at 10 days, 3 months, 6 months, 9 months and 12 months and then every 6 months after completing the intervention. A diary will also be provided as an "aid memoir" to phone calls and to note missed tablets and recurrence of cellulitis.

Phase 4
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Cellulitis/Erysipelas of the Leg
  • Drug: Penicillin VK
    Biconcave tablet 250mg oral, b.d.
  • Other: placebo
    biconcave tablet matching active comparator as much as possible in size and shape
  • Experimental: 1
    Penicillin VK 250 mg b.d.
    Intervention: Drug: Penicillin VK
  • Placebo Comparator: 2
    placebo tablet b.d.
    Intervention: Other: placebo
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
November 2011
November 2011   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Diagnosis of cellulitis of either leg AND a history of at least one previous episode of cellulitis of either leg within the three

Exclusion Criteria:

Any doubt about the certainty of the diagnosis of either the index episode or the previous episode (if applicable), will be grounds for exclusion. Additionally, patients with any of the following will be excluded:

  • Taken antibiotic prophylaxis (defined as more than 3 months usage) for the prevention of cellulitis within 6 months prior to index episode.
  • A time lapse of longer than 12 weeks since the start of treatment for the index episode to the date of potential randomisation into the trial.
  • Known allergy to penicillin.
  • Preceding leg ulceration, surgery or penetrating trauma, as these cases are more likely to be caused by staphylococcal infection. (NB: this does not exclude patients with toeweb maceration/tinea pedis or other minor/blunt wounds).
  • Treating physician or principal investigator unwilling to randomise patient. This includes, but is not limited to:

    • The treating physician and/or patient feels that prophylactic antibiotics are not in the patient's best interests and therefore entry to this study would be inappropriate.
    • The treating physician and/or patient feels it would not be ethical or appropriate for the patient to receive placebo and so they are not willing/able to accept randomisation
    • Concomitant medication that would mean that long-term penicillin is inappropriate
    • Diagnostic uncertainty
    • Gastrointestinal disease causing persistent diarrhoea or vomiting severe enough to affect the absorption of the phenoxymethylpenicillin.
    • Allergic diathesis or severe bronchial asthma severe enough to preclude the use of phenoxymethylpenicillin.
    • Confounding concurrent disease (e.g. DVT).
  • No access to a telephone.
  • Aged less than 16 years.
  • Unable to give informed consent.
  • Already taking part in a research study.
Sexes Eligible for Study: All
16 Years and older   (Child, Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
Ireland,   United Kingdom
EudraCT No. 2006-000381-36
Not Provided
Not Provided
University of Nottingham
University of Nottingham
  • Action Medical Research
  • UK Dermatology Clinical Trials Network
Study Director: Hywel Williams, Professor University of Nottingham
University of Nottingham
July 2012

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP