Difference between revisions of "Potentiated-Sulphonamides"
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| + | Potentiated-sulponamides are a combination of a [[sulphonamides|sulphonamide]] and trimethoprim. By combining the two types of antibiotics the mixture becomes bactericidal and increases their spectrum of activity. In practice they are often referred to as '''T.M.S''' or Trimethoprim Sulphate. | ||
==Mechanism of Action== | ==Mechanism of Action== | ||
| + | The combination of sulphonamide and trimethoprim means that the bacterial nucleotide sythesis pathway is attacked at two seperate points. This produces a bactericidal, time-dependent killing affect. To find out how sulphonamides work click [[sulphonamides|here]] and to discover the same about trimethoprim click [[trimethoprim|here]]. | ||
==Spectrum of Activity== | ==Spectrum of Activity== | ||
| + | The combined nature of the drug mean that they are very broad spectrum and the main species of note that isn't affected is ''Pseudomonas''. | ||
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==Pharmacokinetic Considerations== | ==Pharmacokinetic Considerations== | ||
| + | The half-life of all these drugs are relatively short but their pharmacokinetic properties will depend upon the precise mixture of sulphonamide and trimethoprim, so it is best to check in a formulary before use. | ||
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| + | They all have good tissue penetration and will readily cross the blood brain barrier. As resistance is now a problem with these drugs their efficacy is starting to become limited. | ||
==Side Effects and Contraindications== | ==Side Effects and Contraindications== | ||
Revision as of 13:22, 24 October 2008
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Potentiated-sulponamides are a combination of a sulphonamide and trimethoprim. By combining the two types of antibiotics the mixture becomes bactericidal and increases their spectrum of activity. In practice they are often referred to as T.M.S or Trimethoprim Sulphate.
Mechanism of Action
The combination of sulphonamide and trimethoprim means that the bacterial nucleotide sythesis pathway is attacked at two seperate points. This produces a bactericidal, time-dependent killing affect. To find out how sulphonamides work click here and to discover the same about trimethoprim click here.
Spectrum of Activity
The combined nature of the drug mean that they are very broad spectrum and the main species of note that isn't affected is Pseudomonas.
Pharmacokinetic Considerations
The half-life of all these drugs are relatively short but their pharmacokinetic properties will depend upon the precise mixture of sulphonamide and trimethoprim, so it is best to check in a formulary before use.
They all have good tissue penetration and will readily cross the blood brain barrier. As resistance is now a problem with these drugs their efficacy is starting to become limited.