In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Microbiology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300018 |
Resumo: | Antihistaminics are widely used for various indications during microbial infection. Hence, this paper investigates the antimicrobial activities of 10 antihistaminics belonging to both old and new generations using multiresistant Gram-positive and Gram-negative clinical isolates. The bacteriostatic activity of antihistaminics was investigated by determining their MIC both by broth and agar dilution techniques against 29 bacterial strains. Azelastine, cyproheptadine, mequitazine and promethazine were the most active among the tested drugs. Diphenhydramine and cetirizine possessed weaker activity whereas doxylamine, fexofenadine and loratadine were inactive even at the highest tested concentration (1 mg/ml). The MIC of meclozine could not be determined as it precipitated with the used culture media. The MBC values of antihistaminics were almost identical to the corresponding MIC values. The bactericidal activity of antihistaminics was also studied by the viable count technique in sterile saline solution. Evident killing effects were exerted by mequitazine, meclozine, azelastine and cyproheptadine. Moreover, the dynamics of bactericidal activity of azelastine were studied by the viable count technique in nutrient broth. This activity was found to be concentration-dependant. This effect was reduced on increasing the inoculum size while it was increased on raising the pH. The post-antimicrobial effect of 100 fg/ml azelastine was also determined and reached up to 3.36 h. |
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In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolatesAntihistaminicsbactericidal activitybacteriostatic activityGram-negative isolatesGram-positive isolatesAntihistaminics are widely used for various indications during microbial infection. Hence, this paper investigates the antimicrobial activities of 10 antihistaminics belonging to both old and new generations using multiresistant Gram-positive and Gram-negative clinical isolates. The bacteriostatic activity of antihistaminics was investigated by determining their MIC both by broth and agar dilution techniques against 29 bacterial strains. Azelastine, cyproheptadine, mequitazine and promethazine were the most active among the tested drugs. Diphenhydramine and cetirizine possessed weaker activity whereas doxylamine, fexofenadine and loratadine were inactive even at the highest tested concentration (1 mg/ml). The MIC of meclozine could not be determined as it precipitated with the used culture media. The MBC values of antihistaminics were almost identical to the corresponding MIC values. The bactericidal activity of antihistaminics was also studied by the viable count technique in sterile saline solution. Evident killing effects were exerted by mequitazine, meclozine, azelastine and cyproheptadine. Moreover, the dynamics of bactericidal activity of azelastine were studied by the viable count technique in nutrient broth. This activity was found to be concentration-dependant. This effect was reduced on increasing the inoculum size while it was increased on raising the pH. The post-antimicrobial effect of 100 fg/ml azelastine was also determined and reached up to 3.36 h.Sociedade Brasileira de Microbiologia2011-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300018Brazilian Journal of Microbiology v.42 n.3 2011reponame:Brazilian Journal of Microbiologyinstname:Sociedade Brasileira de Microbiologia (SBM)instacron:SBM10.1590/S1517-83822011000300018info:eu-repo/semantics/openAccessEl-Nakeeb,Moustafa AAbou-Shleib,Hamida MKhalil,Amal MOmar,Hoda GEl-Halfawy,Omar Meng2011-12-21T00:00:00Zoai:scielo:S1517-83822011000300018Revistahttps://www.scielo.br/j/bjm/ONGhttps://old.scielo.br/oai/scielo-oai.phpbjm@sbmicrobiologia.org.br||mbmartin@usp.br1678-44051517-8382opendoar:2011-12-21T00:00Brazilian Journal of Microbiology - Sociedade Brasileira de Microbiologia (SBM)false |
dc.title.none.fl_str_mv |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates |
title |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates |
spellingShingle |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates El-Nakeeb,Moustafa A Antihistaminics bactericidal activity bacteriostatic activity Gram-negative isolates Gram-positive isolates |
title_short |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates |
title_full |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates |
title_fullStr |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates |
title_full_unstemmed |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates |
title_sort |
In vitro antibacterial activity of some antihistaminics belonging to different groups against multi-drug resistant clinical isolates |
author |
El-Nakeeb,Moustafa A |
author_facet |
El-Nakeeb,Moustafa A Abou-Shleib,Hamida M Khalil,Amal M Omar,Hoda G El-Halfawy,Omar M |
author_role |
author |
author2 |
Abou-Shleib,Hamida M Khalil,Amal M Omar,Hoda G El-Halfawy,Omar M |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
El-Nakeeb,Moustafa A Abou-Shleib,Hamida M Khalil,Amal M Omar,Hoda G El-Halfawy,Omar M |
dc.subject.por.fl_str_mv |
Antihistaminics bactericidal activity bacteriostatic activity Gram-negative isolates Gram-positive isolates |
topic |
Antihistaminics bactericidal activity bacteriostatic activity Gram-negative isolates Gram-positive isolates |
description |
Antihistaminics are widely used for various indications during microbial infection. Hence, this paper investigates the antimicrobial activities of 10 antihistaminics belonging to both old and new generations using multiresistant Gram-positive and Gram-negative clinical isolates. The bacteriostatic activity of antihistaminics was investigated by determining their MIC both by broth and agar dilution techniques against 29 bacterial strains. Azelastine, cyproheptadine, mequitazine and promethazine were the most active among the tested drugs. Diphenhydramine and cetirizine possessed weaker activity whereas doxylamine, fexofenadine and loratadine were inactive even at the highest tested concentration (1 mg/ml). The MIC of meclozine could not be determined as it precipitated with the used culture media. The MBC values of antihistaminics were almost identical to the corresponding MIC values. The bactericidal activity of antihistaminics was also studied by the viable count technique in sterile saline solution. Evident killing effects were exerted by mequitazine, meclozine, azelastine and cyproheptadine. Moreover, the dynamics of bactericidal activity of azelastine were studied by the viable count technique in nutrient broth. This activity was found to be concentration-dependant. This effect was reduced on increasing the inoculum size while it was increased on raising the pH. The post-antimicrobial effect of 100 fg/ml azelastine was also determined and reached up to 3.36 h. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-09-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300018 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300018 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1517-83822011000300018 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Microbiologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Microbiologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Microbiology v.42 n.3 2011 reponame:Brazilian Journal of Microbiology instname:Sociedade Brasileira de Microbiologia (SBM) instacron:SBM |
instname_str |
Sociedade Brasileira de Microbiologia (SBM) |
instacron_str |
SBM |
institution |
SBM |
reponame_str |
Brazilian Journal of Microbiology |
collection |
Brazilian Journal of Microbiology |
repository.name.fl_str_mv |
Brazilian Journal of Microbiology - Sociedade Brasileira de Microbiologia (SBM) |
repository.mail.fl_str_mv |
bjm@sbmicrobiologia.org.br||mbmartin@usp.br |
_version_ |
1752122203883700224 |