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Colistin, also known as polymyxin E, is an antibiotic medication used as a last-resort treatment for multidrug-resistant Gram-negative infections including pneumonia. [7] [8] These may involve bacteria such as Pseudomonas aeruginosa, Klebsiella pneumoniae, or Acinetobacter. [9]
Colistin is considered to have high toxicity, mainly having renal and neurological effects, including but not limited to decreased urine secretion, increased urea nitrogen concentrations in the blood and acute tubular necrosis. [7] This is the result of Colistin removal via renal excretion, thus renal function should be monitored.
Polymyxin antibiotics are relatively neurotoxic and nephrotoxic, so are usually used only as a last resort if modern antibiotics are ineffective or are contraindicated. . Typical uses are for infections caused by strains of multiple drug-resistant Pseudomonas aeruginosa or carbapenemase-producing Enterobacteri
The lack of newly emerging antimicobrial drugs have resulted in the revisit of old antibiotic drugs such as colistin (Polymyxins) and fosfomycin, which are traditionally considered to be toxic but have gained a principal role in the treatment of the most problematic MDR Gram-negative pathogens including Pseudomonas aeruginosa, Acinetobacter ...
Potential toxicity to mother and fetus during pregnancy; Enamel hypoplasia (staining of teeth; potentially permanent) Transient depression of bone growth; Inhibits the binding of aminoacyl-tRNA to the mRNA-ribosome complex. They do so mainly by binding to the 30S ribosomal subunit in the mRNA translation complex. But Tetracycline cannot be ...
The growing prevalence and difficulty of treating such multi-drug resistant Enterobacteriaceae has led to a renaissance of the use of antibiotics such as colistin, which was discovered in the 1950s but rarely used until recently due to unattractive levels of toxicity. [37]
Polymyxin B, sold under the brand name Poly-Rx among others, is an antibiotic used to treat meningitis, pneumonia, sepsis, and urinary tract infections. [1] While it is useful for many Gram negative infections, it is not useful for Gram positive infections. [1]
the dose at which toxicity occurs in 50% of cases. LD Lethal Dose the dose at which death occurs in 50% of cases. [6]: 73 [7] [8] TI Therapeutic Index a quantitative measurement of the relative safety of a drug by comparison of the amount of a therapeutic agent that causes toxicity to the amount that causes the therapeutic effect [1]