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Nebcin

Tobramycin sulfate is an aminoglycoside antibiotic used to treat various types of bacterial infections, particularly Gram-negative infections. more...

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Mechanism of action

Tobramycin works by binding to a site on the bacterial ribosome, causing the genetic code to be misread.

Administration

Like all aminoglycosides, tobramycin does not pass the gastro-intestinal tract, so for systemic use it can only be given intravenously or intramuscularly. This formulation for injection is branded Nebcin®. Patients with cystic fibrosis will often take an inhalational form (Tobi®) for suppression of Pseudomonas aeruginosa infections. Tobramycin is also combined with dexamethasone as an opthalmic solution (TobraDex®).

Side effects

Like other aminoglycosides, tobramycin can cause deafness or a loss of equilibrioception in genetically susceptible individuals. These individuals have a normally harmless mutation in their DNA, that allows the tobramycin to affect their cells. The cells of the ear are particularly sensitive to this.

Tobramycin can also be highly toxic to the kidneys, particularly if multiple doses accumulate over a course of treatment.

For these reasons, when tobramycin is given parenterally, it is usually dosed by body weight. Various formulae exist for calculating tobramycin dosage. Also serum levels of tobramycin are monitored during treatment.

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