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Steps:AttachmentPenetrationUncoatingReplicationAssemblyRelease
Drug DrugClass MechanismofAction Indications AdverseEffects ResistanceDocosanol(Abreva) HSVDrug
AliphaticAlcoholInhibitsFusionBetweenHostCellPlasmaMembraneand
HSVEnvelopeTopicalAgentforHSV
IdoxuridineTrifluridine HSVDrug
ThymidineAnalogsTriphosphorylatedtoActiveDrugsthatInhibitDNA
Polymerase
Topical(OpthalmicUse)HSVRetinitis
PoorSystemicAbsorption----------
Trifluridine:Acyclovir-ResisantHSVInfections
Acyclovir HerpesVirusInfectionDrug
Clovirs:GuanineAnalogueswithAnti-ViralActivityAgainstONLY
HerpesVirusesTriphosphorylatedtoActiveDrugs
-----------------------------------ClearedbyGFR&TubularSecretionT1/2DependsonRenalFunction
HSV-1/2:TreatmentandProphylaxis
Genital/MucocutaneousHerpes-------
H.SimplexEncephalitis(HSV-1)H.SimplexKeratitis(HSV-1)
--------HerpesZoster(VZV):ShinglesChickenPox(VZV):Children
-----------------Varicella(VZV)
EpsteinBarrVirus(EBV)--------------------------CMVisResistant
--------------------------PoorOralAbsorption
FewMostFrequently:RenalDysfunction-----------------------
Occasional:GIT:Nausea,Vomiting,Diarrhea
CNS:TremorsLethargy-------------------
IVAdministration:InfusionSitePhlebitis/Inflammation(Extravasation)ReversibleKidneyDysfunctionduetoCrystalline
Nephropathy
AcyclovirResistance:InHSV/VZV:
MutationinViralThymidineKinase-->DeficiencyinThymidineKinaseActivity-->CrossResistancewithAllOtherClovirs
ORDNAPolymeraseMutation
----------------------------------------------ResistantHSVIsloatesinHIV-Positive
PatientsAssocatedWith:ChronicCutaneousLesionsand
InvasiveDisease(Rarely)
ValacyclovirFamciclovirPenciclovir
HerpesVirusInfectionDrug
Clovirs:GuanineAnalogueswithAnti-ViralActivityAgainstONLY
HerpesVirusesTriphosphorylatedtoActiveDrugs
-----------------------------------Pro-Drugs:
Valacyclovir-->Acyclovir(ProlongedRelease)Famciclovir-->Penclovir
Pencyclovir:NotAbsorbedOrally
SimilarActivitytoAcyclocvirAchievesHigherIntracellularLevels
VaricellaZoster(VZV)HerpesSimplex(HSV)
Cidofovir:AlsoEffectiveforAdenoviruses
SameasAbove
AcyclovirResistance:InHSV/VZV:
MutationinViralThymidineKinase-->DeficiencyinThymidineKinaseActivity-->CrossResistancewithAllOtherClovirs
ORDNAPolymeraseMutation
----------------------------------------------ResistantHSVIsloatesinHIV-Positive
PatientsAssocatedWith:ChronicCutaneousLesionsand
InvasiveDisease(Rarely)
Foscarnet HerpesVirusInfectionDrug
Tri-SodiumSaltofPhosphonoformate(InorganicPyrophosphate)
-----------------------------------------------------------------SpecificallyInhibitsViralDNAPolymeraseandRNA
PolymeraseandHIVReverseTranscriptasebyCompetingforthePyrophosphateBindingSite
DrugofChoice:Acyclovir-ResistantHSV
orVZVInfections--------------------------------
ImmunocompromisedwithCMVRetinitis
MucocutaneousAcyclovir-ResistantHSVInfections
RenalImpairment(MajorToxicity)-->Hypokalemia,Hypomagnesemia,Hypocalcemia
Resistance:MutationsinCMVUL54Gene,which
EncodesforDNAPolymerase
Ganciclovir CytomegalovirusInfectionDrugs(CMV)
GaunosineAnalog:ActivatedviaPhosphorylation-------------------------
InCMVInfectedCells,InitialPhosphorylationisbyVirus-SpecificKinase(UL97),then2xbyHostKinase
--------ActivatedTriphosphateInhibitsViralDNAPolymerase
andTerminatesViralDNAElongation
HasInVitroActivityAgainst:CMVHSVVZVEBCHHV-6HHV-8
--------------------------------CMVRetinitis/Prophylaxis(Oral,IV,InraocularImplant)
Valganciclovir CytomegalovirusInfectionDrugs(CMV)
Prodrug:MetabolizedtoGanciclovirMuchHigherBioavailability
OralCMVRetinitis
CMVProphylaxis(TransplantPatients)SeeAbove
Foscarnet CytomegalovirusInfectionDrugs(CMV)
SeeAbove CMVRetinitis(IV) SeeAbove
Cidofovir CytomegalovirusInfectionDrugs(CMV)
SeeAbove CMVRetinitis(IV) SeeAbove
Drug DrugClass MechanismofAction Indications AdverseEffects Resistance
AmantadineRimantadine InfluenzaVirusInfectionDrugs
PreventsUncoatingofInfluenzaABindstoM-2Protein
(IonChannelPromotingBuddingofMatureVirus)--------------------------
AppeartobeVirustaticAffectMaturationofInfluenzaHAGlycoproteininTrans-
GolgiNetwork
NotUsedinUSA(Resistance)InfluenzaA
ProphylaxisandEarlyTreatment
Amantadine>RimantadineOccursMoreinElderlyPatients
GI:NauseaCNS:Lightheadedness,Insomnia
ResistanceisCommonMutationsoftheM-2Protein
OseltamivirZanamivir InfluenzaVirusInfectionDrugs
SelectivelyInhibitsViralNeuraminidasesPreventsVirionRelease
Oseltamivir:Pro-DrugActivatedinLiver
InfluenzaA+B(IncludesH1N1,H5N1)
ProphylaxisandEarlyTreatment
OseltamivirToxicity:GIDistrurbanceZanamivirToxicity:Bronchospasm
VralNeuraminidaseMutations
Drug DrugClass MechanismofAction Indications AdverseEffects Resistance
Interferon ViralHepatitisBInfectionDrugs
GlycoproteinProducedNaturallybyDifferentCellsintheImmune
SystemafterExposuretoViruses------------------------------------
IncreasesActivityofJAK-STATPathwayInducesUp-RegulationofAnti-ViralProteins
---------BindstoCellSurfaceReceptor
InducesExpressionofTranslationInhibitoryProtein(TIP)TIPBindstoRibosome
InhibitsExpressionofViralProteins----------------------------------------------------------
GeneralClasses:Alpha,Beta,Gamma
Administration:ParenteralOnly(IV,SQ,NasalSpray)
--------------------------------BroadSpectrumDNAViruses:
ChronicHepatitisBHSV-1/2andHerpesZoster
HPV(GenitalWarts)-----
RNAViruses:ChronicHepatitisC
Influenza(CommonCold)BreastCancerLungCancer
Kaposi'sSarcoma(AIDSPatients)
Flu-LikeSymptoms(Headache,Fatigue,Anthralgias,Fever,Chills)
Depression,InsomniaAlopecia
Thyroiditis:CanUnmaskorExacerbate(MayNotbeReversibleafterStoppingTreatment)
Ribavirin ViralHepatitisBInfectionDrugs
Pro-Drug:GuanosineAnalogActivated(Phosphorylated)byHost
KinasesviaPhosphorylationtoActiveMetabolite-----------------------------------
InterfereswithSynthesisofGTPInhibitsViralRNA-DependentDNAPolymeraseandCappingofViralmRNA
-------------------------------UsesTriphosphatetoInhibitReplicationofBothDNAand
RNAViruses
UsedinCombinationwithInterferon----------------------InfluenzaA+BParainfluenzaDoC:RSV
ParamyxovirusesHCVHIV-1
Lamivudine ViralHepatitisBInfectionDrugsNucleosideAnalogInhibitsHBVDNAPolymerase
-------AlsoInhibitsHIVReverseTranscriptase
HIV/HBVCo-Infection Well-Tolerated RapidEmergencyofDrugResistance
Adefovir ViralHepatitisBInfectionDrugs
AdenineNucleotideAnalog:PhosphorylatedbyCellularKinasestoActiveDiphosphateMetabolite-->
CompetitivelyInhibitsHBVDNAPolymeraseandCausesChainTerminationafterIncorporationintoViralDNA
BroadSpectumHBVHIV
HerpesViruses------------------------------
UsedtoTreatLamivudine-ResistantHBV
MoreExpensiveandToxicthanLamivudineLessLikelytoDevelopResistancethan
Lamivudine
Entecavir ViralHepatitisBInfectionDrugs
GuanosineNucleosideAnalogSimilartoAdefovir-------------
CompetitivelyInhibitsAll3FunctionsofHBV:1.DNAPolymerase,IncludingBasePriming
2.ReverseTranscriptionoftheNegativeStrand3.SynthesisofthePositiveStrandofHBVDNA
PowerfulAnti-Viral100%OralBioavailability
------ResultsinDisappearanceofHBsAg,HBV-DNA,andSeroconversionto
Hbe-Ag-Negative
Interferon+Ribavirin ViralHepatitisCInfectionDrugs
Sofosbuvir ViralHepatitisCInfectionDrugs NucleotideInhibitorofHCVRNANS5BPolymerase
VeryHighCureRates----------------------ChronicHepatitisC(Genotype1,2,3,4)
GiveOD(WithPeginterferonAlfa+Ribavirin)
PancytopeniaSuicidalIdeation
DiarrheaAnemiaHeadacheInsomniaFatigue
Contraindicated:PregnanctWomenandMenwith
PregnantFemalePartners
BoceprevirSimeprevirTelaprevir
ViralHepatitisCInfectionDrugs ProteaseInhibitors Co-AdministerwithRibavirinContraindicated:
PregnanctWomenandMenwithPregnantFemalePartners
Hemolytic Anemia