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9 Cards in this Set

  • Front
  • Back
sulfanomide
bacteriostatic
inhibits PABA, which inhibits dihydrofolic synthesis which ultimately inhibits DNA synthesis.
it is selective to bacteria because we do not synthesize folate, needed for PABA.
used for UTI
Trimethoprim
inhibits tetrahydrofolate synthesis, which stops DNA synthesis.
also selective to bacteria.
used for UTI
cannot be used during pregnancy/lactation
Sulfamethoxazole& Trimethoprim
SMZ inhibits PABA and TMP inhibits dihydrofolic acid. they work synergistically.
used for UTI, bronchitis/pneumonia and pneumocystis jirovecii.
Resistance
-destroy antibiotic
-decrease antibiotic uptake
-increase antibiotic exit
-alter antibiotic target site
selection pressure
how use of antibiotics promotes bacterial resistance
cross resistance
if a bacterial strain is resistant to one class of drugs, it is often resistant to all drugs of that class
multiple drug resistance
if a bacterial strain is resistant to more than one type of antibiotic, it is said to exhibit multiple drug resistance.
chromosomal resistance
usually gives to 1 or 2 antibiotic resistance
but it is not transferable
plasmid resistance
usually gives multiple >4 resistance and can be transferred to another bacteria