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The large hydrophilic molecule of vancomycin is able to form hydrogen bond interactions with the terminal D-alanyl-D-alanine moieties of the NAM/NAG-peptides. Under normal circumstances, this is a five-point interaction.
The mechanism of resistance to vancomycin found in enterococcus involves the alteration of the peptidoglycan synthesis pathway. [8] The D-alanyl-D-lactate variation results in the loss of one hydrogen-bonding interaction (four, as opposed to five for D-alanyl-D-alanine) being possible between vancomycin and the peptide.
Glycopeptide antibiotics are a class of drugs of microbial origin that are composed of glycosylated cyclic or polycyclic nonribosomal peptides.Significant glycopeptide antibiotics include the anti-infective antibiotics vancomycin, teicoplanin, telavancin, ramoplanin, avoparcin and decaplanin, corbomycin, complestatin and the antitumor antibiotic bleomycin.
A classic example of this effect is the interaction between β-lactams, which damage the bacteria cell membrane, and aminoglycosides, which inhibit protein synthesis. [1] The damage dealt to the cell wall by β-lactams allows more aminoglycoside molecules to be taken up into the cell than would otherwise be possible, enhancing cell damage. [ 1 ]
Antibiotics that usually have activity against vancomycin-resistant Enterococcus (VRE): . Linezolid and Tedizolid; Streptogramins such as quinupristin-dalfopristin; Advanced generation tetracyclines: Tigecycline, Omadacycline, Eravacycline
The diagnosis of vancomycin-resistant Staphylococcus aureus (VRSA) is performed by performing susceptibility testing on a single S. aureus isolate to vancomycin. This is accomplished by first assessing the isolate's minimum inhibitory concentration (MIC) using standard laboratory methods, including disc diffusion, gradient strip diffusion, and automated antimicrobial susceptibility testing ...
At extremely high doses of clindamycin, skeletal muscle paralysis has been demonstrated in several species. Lincosamides can interact with anesthetic agents to produce neuromuscular effects. [29] Other adverse reactions include diarrhea, nausea, vomiting, abdominal pain and rash.
It belongs to the same class as vancomycin, the most widely used and one of the treatments available to people infected with methicillin-resistant Staphylococcus aureus (MRSA). [7] Dalbavancin is a semisynthetic lipoglycopeptide that was designed to improve upon the natural glycopeptides vancomycin and teicoplanin. [8]