Opi Colistin 500
Dosage Form :Water soluble powder
1-Composition:
Each 1 gm contains:
Colistin sulphate……………………………………………….. 0.208 gm
Eq.to colistin 0.166 gm (5 M.I.U)
2-Properties:
Colistin is a polypeptide antibiotic belonging to the class polymyxins.
Colistin has a bactericidal action on sensitive bacterial strains, by disorganization of their cytoplasmic membrane, leading to an alteration of cell permeability and thus to a loss of intracellular material.
Colistin has a bactericidal power against a broad spectrum of Gram-negative bacteria, including enterobacteria and in particular Escherichia coli. Colistin has very little activity against Gram-positive bacteria and fungal organisms.
Gram-positive bacteria, As well as some species of Gram-negative bacteria such as Proteus and Serratia, are naturally resistant to colistin.
However, the acquisition of resistance of Gram-negative enteric bacteria to colistin is rare and can be explained by simple mutation.
Colistin exhibits concentration-dependent activity against Gram-negative bacteria. Following oral administration, High concentrations are observed in the gastrointestinal tract. i.e.,the target site. Due to the low absorption of the substance.