American Journal of Clinical Dermatology

, Volume 2, Issue 4, pp 263–266

The Combination Formulation of Clindamycin 1% plus Benzoyl Peroxide 5% versus 3 Different Formulations of Topical Clindamycin Alone in the Reduction of Propionibacterium acnes

An In Vivo Comparative Study
Original Research Article

DOI: 10.2165/00128071-200102040-00007

Cite this article as:
Leyden, J., Kaidbey, K. & Levy, S.F. Am J Clin Dermatol (2001) 2: 263. doi:10.2165/00128071-200102040-00007



Isolates of Propionibacterium acnes resistant to one or more anti-acne antibiotics (most commonly erythromycin) are being increasingly reported, and the emergence of resistant strains can be associated with therapeutic failure of topical treatment.


Comparison of the in vivo effectiveness of the combination of clindamycin 1% plus benzoyl peroxide 5% in a gel formulation to that of each of 3 clindamycin 1% preparations (gel, lotion, and solution) with respect to reduction in counts of P. acnes cultured from the foreheads of healthy volunteers.


The effects of treatment with the 4 study drugs were compared in an open-label study. Cultures were collected before, after 1 week and after 2 weeks of treatment.


Treatment with the combination formulation resulted in a 99.8% (>2 logs) reduction in total propionibacterial numbers after 1 week of therapy compared with 30 to 62% (<1 log) decreases for the different formulations of topical clindamycin alone. By the end of week 2, the combination had decreased P. acnes counts by more than 99.9% (>3 logs) relative to reductions of from 88 to 95% (< or > 1 log) for the single agent formulations.


Under the conditions of the present study, the combination of clindamycin 1% plus benzoyl peroxide 5% gel produced more rapid and highly significant reductions in P. acnes compared with formulations containing clindamycin alone.

Copyright information

© Adis International Limited 2001

Authors and Affiliations

  1. 1.Department of DermatologyUniversity of Pennsylvania School of MedicinePhiladelphiaUSA
  2. 2.Dermik LaboratoriesBerwynUSA