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Duration of antibacterial effectiveness of gentamicin ear drops in external otitis

Published online by Cambridge University Press:  08 March 2006

Raul Colodner ,
Yoram Keness ,
Yoseph Rakover ,
Amnon Smuskovitz  and
Gabriel Rosen
Raul Colodner
Affiliation:
Department of Otorhinolaryngology, Ha’Emek Medical Center, Afula, Israel
Yoram Keness
Affiliation:
Department of Otorhinolaryngology, Ha’Emek Medical Center, Afula, Israel
Yoseph Rakover
Affiliation:
Department of Otorhinolaryngology, Ha’Emek Medical Center, Afula, Israel
Amnon Smuskovitz
Affiliation:
Department of Otorhinolaryngology, Ha’Emek Medical Center, Afula, Israel
Gabriel Rosen
Affiliation:
Department of Otorhinolaryngology, Ha’Emek Medical Center, Afula, Israel
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Abstract

The recommendation of Anderson and Steele, for the use of ear drops four times a day, has not been changed since 1948. In order to re – evaluate the frequency of using ear drops, we examined the duration of the effectiveness of the antibacterial activity of gentamicin ear drops in external otitis. Seventeen patients (25 ears) with external otitis were studied. We took 18 samples from each ear at 0, 1, 2, 3, 6, 8, 10, 12 and 14 hours and measured the concentration of gentamicin on the wick and in the ear canal. We found that the concentration of gentamicin began to decrease only after 12 hours and a more significant decrease was detected after 14 hours of treatment. We have shown that the antibiotic used on the wick is effective for 12 hours. In conclusion, we recommend using ear drops twice a day on a wick as routine therapy for external otitis.

Keywords

OtitisExternaDrugDeliverySystemsGentamicin
Type
Research Article
Information
The Journal of Laryngology & Otology , Volume 114 , Issue 11 , November 2000 , pp. 827 - 829
Copyright
© Royal Society of Medicine Press Limited 2000

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