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Penicillin to prevent recurrent leg cellulitis.

Kim S Thomas1, Angela M Crook, Andrew J Nunn

  • 1Centre of Evidence-Based Dermatology, University of Nottingham, Nottingham, United Kingdom.

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Low-dose penicillin effectively prevented recurrent leg cellulitis during a 12-month prophylaxis period. However, this protective effect on cellulitis recurrence waned after stopping the antibiotic treatment.

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Area of Science:

  • Infectious Diseases
  • Dermatology
  • Pharmacology

Background:

  • Leg cellulitis is a common bacterial skin infection.
  • Recurrent episodes pose a significant health burden.
  • Prophylactic strategies are needed to prevent recurrence.

Purpose of the Study:

  • To evaluate the efficacy of low-dose penicillin in preventing recurrent leg cellulitis.
  • To compare penicillin prophylaxis with placebo in a randomized controlled trial.

Main Methods:

  • A double-blind, randomized controlled trial was conducted with 274 patients experiencing recurrent leg cellulitis.
  • Participants received either penicillin (250 mg twice daily) or placebo for 12 months.
  • The primary outcome was the time to the first recurrence of cellulitis, with follow-up up to 3 years.

Main Results:

  • During the 12-month prophylaxis, penicillin significantly reduced cellulitis recurrence (22% vs. 37% in placebo group; P=0.01).
  • The number needed to treat with penicillin to prevent one recurrence was 5.
  • No significant difference in recurrence rates was observed during the follow-up period after prophylaxis ended.

Conclusions:

  • Penicillin prophylaxis is effective in preventing leg cellulitis recurrence during treatment.
  • The protective benefit of penicillin diminishes after cessation of therapy.
  • Further research may explore long-term management strategies for recurrent cellulitis.