drug drug class mechanism of action indications adverse ... · 12/3/2017 · antidotes:...
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Drug DrugClass MechanismofAction Indications AdverseEffects Resistance
Aminoglycosides30SRibosomeInhibitor
Bacteriocidal
AminoglycosideTransportintoBacteria:Energy-Dependent(O2)Process:AminoglycosidesActivelyTransportedAcrosstheMembraneofAerobicGram-
BacteriaintotheCytoplasm---------------------------------------------------------
TransportMaybeEnhancedbyCellWallActiveDrugs(Penicillin/Vancomycin)-------------------------------
AminoglycosidesIRREVERSIBLYBindto30STheyInterferewiththeInitiationComplexofPeptide
Formation(-Static)TheyIncorporateIncorrectAminoAcidsintothePeptide,
ResultinginFunctionalorToxicProtein(-Cidal)
AerobicGram-Rods--------------------------------------
WaterSolublePoorGITAbsorption
PARENTERAL(IV/IM)ONLYDoesNOTCrossBBB
SingleDailyDoseisMostEffectiveExhibitsConcentration-DependentKillingandPost-AntibioticEffect
Nephrotoxic:AcuteTubularNecrosisEnhancedby:
AmphotericinB,Vancomycin,Cisplatin,Cyclosporine------------------------------------------------------------------------
Ototoxic:AuditoryandVestibularDamage(HairCellDamage)
---------------------------------------------------------------------NarrowTherapeuticIndex
DrugMonitoringforRenalFunction(DoseDepedent)----------
NeuromuscularBlockade:Curare-LikeEffectwithRespiratoryParalysis
MuscleToneisLostCaution:
MyastheniaGravisPatients(DuetoDecreasedAChRelease)
----------------Antidotes:Neostigmine
CalciumGluconates--------------------------------------------
ContactDermatitis(TypeIV):Neomycin
AnaerobesareInnatelyResistant----------------------------------
Mechanisms:InactivationbyAcetylation,Adenylation,
andPhoshphorylation:Plasmid-MediatedSynthesisofEnzymesthatmodifyandinactivetheantibiotic.
Examples:AcetylTransferases
NucleotidyltransferasesPhosphotransferases
------------------------------------Netilmicin/Amikacin:
LessVulnerabletotheseEnzymes---------------------------------------------------
Mechanisms:ImpairedEntryIntotheCell:
Mutations/DeleationofPorinProteinorO2TransportProteins
-------------MutationofReceptorProteinon30S
Ribosome
StreptomycinAminoglycosides
30SRibosomeInhibitorBacteriocidal
SameasAbove
DrugofChoice:YersiniaPestis(Plague)
FrancisellaTularensis(Tularemia)---------------------------------------Streptomycin+PenicillinG:
Endocarditis(EnterococcalandViridans)
------------------------------------------MycobacteriumTuberculosis
GentamicinAminoglycosides
30SRibosomeInhibitorBacteriocidal
SameasAbove
PseudomonasAeruginosaKlebsiellaProteusSerratiaE.Coli
EnterobacterSpp.---------------------------------------------
Penicillin/Vancomycin+Gentamicin:Serious
Enterococcal,Staphylococcal,S.VirdianInfections
AmikacinAminoglycosides
30SRibosomeInhibitorBacteriocidal
ResistanttoAminoglycosideInactivatingEnzymesExpensive
ReservedforwhenthereisGentamycin/StreptomycinResistance
SameSpectrumasGentamicin----------------------
MorePotent:PseudomonasSecondLine:Tuberculosis
TobramycinAminoglycosides
30SRibosomeInhibitorBacteriocidal
CanbeInhaled(CysticFibrosisPatients)SameSpectrumasGentamicin
----------------------MorePotent:Pseudomonas
ParomomycinAminoglycosides
30SRibosomeInhibitorBacteriocidal
ONLYAminoglycosideActiveAgainst:EntamoebaHistolyticaCytosporidiumParvumVisceralLeishmaniasis
VariousTapeworms(Solium)
NeomycinKanamycin
Aminoglycosides30SRibosomeInhibitor
Bacteriocidal
TopicalUseNeomycin+Bacitracin+Polymyxin:
TripleAntibioticOintment
MinorSoftTissueInfections(CombinedwithBacitracin/Polymyxin)
-------------------------OralNeomycin:(LactuloseisDoC)
HepaticEncephalopathyandinPreparationforElectiveBowelSurgery
(+Erythromycin)
LimitedUseDuetoToxicity
Spectinomycin Spectinomycin30SRibosomeInhibitor
StructurallyRelatedtoAminoglycosidesAlternativeTreatmentforGonorrhea
(PatientsAllergictoPenicillins/Cephalorsporins)
NotAvailableinUSA
Drug DrugClass MechanismofAction Indications AdverseEffects Contraindications
Tetracyclines30SRibosomeInhibitor
Bacteriostatic
BindsREVERSIBLYto30SSubunitBlockstheBindingofAminoacylt-RNAtotheAcceptorSite(A)onmRNARibosomeComplex
PreventsAdditionofAminoAcidstotheGrowingPeptide----------------------------------------------------------------------------
OralAbsorptionisImpairedby:ChelationwithCations(Ca++,Mg++,Fe++,Al++)
DairyFoodandAntacids
BroadSpectrumGram+andGram-------------------
Gram+:StreptococcusGram-:Neisseria
H.Pylori(BMTRegimen)H,DucreiBrucellaV.Cholera
AtypicalBacteria:ChlamydiaRiskettsiae
Mycoplasma(DoC)BorreliaBurgdorferi
Protozoa:PlasmodiumFalciparumEntamoebaHistolytica
Anaerobes:C.Perfringens
C.Tetani
CrossesPlacenta:BoneDeformites/ToothDysplasiasintheFetus
-------------------------------------------------------------------GIUpset
ToothEnamelDysplasiaDecreasedBoneGrowth(Children)
Renal:FanconiSyndrome-RenalDamageLiver:Hepatotoxicity
------------------------------------------Phototoxicity:
Tetracycline,Demeclocycline,DoxycyclineOtherDrugsCausingPhototoxicity:
Sulfonamides,Fluroquinolines-----------------------------------
EffectsonIntestinalMicroflora:OccuranceofSuperinfections
(C.Diff,Pseudomonas,Proteus,Yeasts)PseudomembranousColitis
PregnancyPrepubertalChildren(<8)
SeriousHepatic/RenalDiseases(DoxycyclineisusedinRenalDisease)
CannotuseinIMInjections(CausesPainandInflammation)
IVandOralONLY--------------------------------
Resistance:PlasmidMediatedEffluxPump
LargeResistance
DoxycylineTetracyclines
30SRibosomeInhibitorBacteriostatic
CompletelyAbsorbedEliminatedbyLiver(UsedinKidneyDysfunction)
GivenTwiceDailyIsNOTSignificantlyAffectedbyFood
DrugofChoice:AllAtypical!!ChlamydialInfections
(Urethritis,PID,Cervicitis,Etc)Rickettsiae
MycoplasmaPneumoniaBorreliaBurgdorferi
OralGivenTwiceDaily
AbsorptionNOTAffectedbyFood
TetracyclineTetracyclines
30SRibosomeInhibitorBacteriostatic
EliminatedbyLiver(UsedinKidneyDysfunction)
DemeclocyclineTetracyclines
30SRibosomeInhibitorBacteriostatic
DiabetesInsipitus
MinocyclineTetracyclines
30SRibosomeInhibitorBacteriostatic
CompletelyAbsorbedEnterstheBrain
AppearsinTears/Saliva
UsefulinEradicatingMeningococcalCarrierState
(RifampinisPREFERRED)
Tigecycline Glycylcyclines SameasTetracyclines
SlowIVInfusionEliminatedbyLiver
Broad-SpectrumActivityMRSADRUG
Vancomycin-ResistantEnterococciDrug
Drug DrugClass MechanismofAction Indications AdverseEffects Contraindications
ErythromycinClarithromycinAzithromycinRoxithromycin
Macrolides50SRibosomeInhibitor
Bacteriostatic
LactoneRingwithDeoxySugarsAttached-------------------
ProteinSynthesisInhibitors:IRREVERSIBLYBindto50SSubunitofBacterialRibosomeandInhibittheTranslocationStepofProteinSynthesis------------------------------------------------------------------------
AllShouldbeTakeonanEmptyStomach(LikeTetracyclines)
UsedinPatientsAllergictoB-LactamAntibiotics(Penicillins)
Gram+Infections
EpigastricDistress:(MorewithErythromycin)GITProblems(MostCommon)
CholestaticJaundice(withEstolate)------------------------ProkineticAction:
MacrolidesBindwithMotilinReceptorsinGIT
IncreasesIntestinalMotility(Diarrhea)---------------------------------
ProlongQTIntervalandArrhythmias
HepaticDysfunction--------------------------------
DrugInteractions:ErythromycinandClarithromycin:
InhibitCYP450EnzymesInhibitMetabolismof:
TheophyllineWarfarinCyclosporineMethylprednisolone------------------------
INCREASELevelsofDigoxin:ByInhibitingitsInactivationinthe
Intestine---------------------------------------------------
MechanismsofResistance:DecreasedAffinityofthe50SRibosomal
SubunitGram+Bacteria:
ProducesMethylase, thatAddsaMethylGroup(RibosomalProtection)PresenceofPlasmidAssociated
ErythromycinEsterase(HydrolyzesMacrolides)
InabilitytoPenetrate/IncreasedEffluxCross-ResistanceisCompleteBetweenErythromycinandOtherMacrolides.
ErythromycinMacrolides
50SRibosomeInhibitorBacteriostatic
Classic**PoorBiovailabilityFrequentDosingGIIrritability
LimitedH.InfluenzaeCoverage**-------------------------------------------------------
AcidLabileAdministeredinEntericCoating
DoesNOTCrossBBBInhibitsManyCYP450Enzymes
ExcretedPrimarilyinBile(GoodforRenalFailurePatients)
Gram+Cocci(NotMRSA)CorynebacteriumDiptheriae
Gram-:Gonorrhea,Legionella,BordetellaPertussisAtypicalOrganisms:
Mycoplasma,Chlamydia,Ureaplasma,Campylobacter,Spirochetes,H.Pylori,Listeria
Monocytogenes
HigherGIIntolerance
ClarithromycinMacrolides
50SRibosomeInhibitorBacteriostatic
*SyntheticOvercomesErythromycinLimitations(Above)*---------------------------------
InhibitsManyCYP450EnzymesExcretedPrimarilyinBile
GreaterActivityAgainst:M.AviumH.Pylori
ToxoplasmaGondiiH.Influenza
LowerGIIntolerance
AzithromycinMacrolides
50SRibosomeInhibitorBacteriostatic
*SyntheticOvercomesErythromycinLimitations(Above)*DOESNOTINHIBITCYP450GiveOnlyONCEPerDay
MoreActiveinRespiratoryInfections(H.Influenza,Moraxella,
MycobacteriumAvium,Chlamydia)-----------------------------
CommunityAcquiredPneumoniaPharyngitis
ChlamydialInfectionsSkinInfections
ExcretedbyKIDNEYMoreToleratedinPregnancy
RoxithromycinMacrolides
50SRibosomeInhibitorBacteriostatic
Drug DrugClass MechanismofAction Indications AdverseEffects Resistance
Clindamycin Bacteriostatic NotaMacrolideBUTHasSameMechanism
TreatmentofSkinandSoftTissueInfectionsStreptocociStaphylococci
BacteroidesFragilis----------------
ProphylaxisofEndocarditisinPatientswithValvularHeartDiseasewhoareUndergoingCertainDentalProcedures
andhavePenicillinAllergies(RecommendedoverErythromycin)
-----------------------Clindamycin+Primaquine:AlternativeMedication
P.JiroveciPneumoniainAIDS------------------------------------
Clindamycin+Pyrimethamine:Toxoplasmosis(Brain)inAIDS
NauseaDiarrhea
SkinRashesPseudomembranousColitis-------------------------------
C.DiffisResistanttoClindamycin----------------------------------------------------ImpairedLiverFunctionandNeutropenia
Drug DrugClass MechanismofAction Indications AdverseEffects Resistance
Ear Infections
Chloramphenicol Bacteriostatic
BindsReversiblytothe50SSubunitPreventsPeptidyltransferaseEnzymefromTransferring
theGrowingChainfromthe"P"SitetotheBoundChargedtRNAatthe"A"Site.
--------------------------OralAdministration
Rapidly/CompletelyAbsorbedDoesCrossBBB
MetabolizedtoGlucuronideConjugatebytheLiver
BroadSpectrum(AllAlternative)BacteroidesBFragilis
H.InfluenzaeMeningococcalMeningitis
(N.Meningitis)ClostridiaRickettsiaeMycoplasma
TyphoidFever(Salmonella)-------------------------NOTChlamydia-----------------
UsedTopicallyinTreatmentofEyeInfections
(PenetratesOcularTissuesandAqueousHumor)
CanAntagonizeBacteriocidalDrugs(PenicillinsandAminoglycosides)
--------------------------GIUpset
BoneMarrowSuppression(AplasicAnemia)Oral/VaginalCandidiasisGrayBabySyndrome:
MainlyinPrematureNeonatesNewbornsLackEffectiveGlucuronideConjugationand
DetoxificationMechanism.Doses>50mg/mg/dayCauses:
VomitingFaccidity
HypothermiaGrayColorShock
VascularCollapse
Resistance:ProductionofAcetyltransferasesCapable
ofInactivatingtheDrug-------------------------------------------------------
DrugInteractions:InhibitsCYP450(OxidaseEnzymes):
ProlongsHalfLifeof:PhenytoinCoumarin
Tolbutamide
Linezolid SyntheticOxazolidinone
Bindsto50SSubunitInhibitsBacterialProteinSynthesisbyInhibitingthe
Formationof70SInitationComplex(N-Formylmethionyl-tRNA-ribosome-mRNATernaryComplex)
RecentlyIntroducedCombatsResistantGram+
VRSAandVREDrugResistantPneumococci
MycobacterialTuberculosis
NocardiaInfections
ThrombocytopeniaAnemiaandNeutropenia------------------------------------
IfGivenwithSSRIs:SerotoninSyndrome
QuinupristinDalfopristin Streptogramins
EachComponentBindstoaSeparateSiteonthe50SSubunitandSynergisticallyInterruptsProteinSynthesis
UsedasaMixture(30:70)VRSA
VRE(E.FaeciumOnly)(NotEffectiveAgainstEnterococcus
Faecalis)
Infusion-RelatedEvents:PainArthralgia-MyalgiaSyndrome