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Modulation of Antibiotic Efficacy against Klebsiella pneumoniae by Antihistaminic Drugs | OMICS International | Abstract
ISSN: 2161-0703

Journal of Medical Microbiology & Diagnosis
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Research Article

Modulation of Antibiotic Efficacy against Klebsiella pneumoniae by Antihistaminic Drugs

Tarek El-Said El-Banna, Fatma Ibrahim Sonbol, Ahmed Ahmed Abd El-Aziz and Omnia Momtaz Al-Fakharany*

Pharmaceutical Microbiology Department, Faculty of Pharmacy, Tanta University, Egypt

*Corresponding Author:
Al-Fakharany OM
Pharmaceutical Microbiology Department
Faculty of Pharmacy, Tanta University, Egypt
Tel: 20 40 3344352
E-mail: [email protected]

Received: December 14, 2015; Accepted: March 21, 2016; Published: March 26, 2016

Citation: El-Banna TES, Sonbol FI, El-Aziz AAA, Al-Fakharany OM (2016) Modulation of Antibiotic Efficacy against Klebsiella pneumoniae by Antihistaminic Drugs. J Med Microb Diagn 5:225. doi: 10.4172/2161-0703.1000225

Copyright: © 2016 El-Banna TES, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Antihistaminic drugs are widely used for various indications during microbial infection. Hence, this paper has investigated the antibacterial activity of seven antihistaminic drugs belonging to both old and new generations against multiresistant K. pneumonia isolates. The bacteriostatic activity of these tested drugs was investigated by determining their MIC by agar dilution technique against thirty multiresistant K. pneumoniae isolates. Two drugs namely promethazine, cyproheptadine showed antibacterial activity against the tested K. pneumoniae isolates with MIC values rangining from 400-1000 μg/ml (far more than their biological levels). In contrast, other tested drugs showed no in-vitro antibacterial activity under the conditions of test. Investigation of the interaction between the tested drugs and different antibiotics against multiresistant K. pneumoniae isolates revealed that synergism was major in case of combination with macrolides, aminoglycosides and quinolones especially with promethazine, cyproheptadine, cetirizine and diphenhydramine. The effect of tested drugs on antibiotic efflux by the tested isolates was also investigated. It was observed that promethazine and cyproheptadine were the most effective efflux pump inhibitor at a concentration of 100 μg/ml. Upon studying the effect of tested drugs on biofilm formation by K. pneumoniae, it was found that promethazine was the most effective inhibitor of biofilm formation. It reduced biofilm formation by K. pneumoniae in a concentration-dependent manner and prevented biofilm formation at a concentration of 100 μg/ml. In the present study, it was found that the use of 100 μg/ml chlorpheniramine resulted in the conversion of separate rod shape of K. pneumoniae cells into long filaments. This was confirmed by transmission electron microscope where septum formation with no separation was recorded. In conclusion, the data obtained in this work showed that, among the tested drugs promethazine and cyproheptadine exerted high antibacterial activity against MDR K. pneumoniae isolates. So, it is possible to take the advantages of the obtained findings to introduce new ways to overcome different infectious diseases.


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