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18 Cards in this Set
- Front
- Back
Acylovir
mechanism |
"Zovirax"
anti-herpetic needs to be first mono-phosphorylated by viral thymidine kinase (TK) & then activated to "Acylovir-triphosphate" substrate and inhibitor of viral polymerase--gets incorporated into the DNA of virus (purine analog) and terminates chain (because it lacks the ribosyl 3-hydroxyl group) |
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Acylovir
indications side effects |
Herpes Simplex (HSV) and varicella-zoster (VZV)
*does not get rid of latent virus reduces viral shedding in genital herpes, decreases acute neuritis in shingles but no effect in postherpetic neuralgia. reduces symptoms if used early in chickenpox. prophylactic for immunocompromised SE: Crystalluria neurotoxicity (seizures, headache, confusion, agitation) (not hematotoxic!) |
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Valacyclovir
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"Valtrex"
Pro-drug oral bioavailability increased 50% Prevention of CMV reactivation in immunocompromiced. HSV, EBV, VZV, mucocutaneous herpes, HSV denritic keratitis SE: Crystalluria neurotoxicity (seizures, headache, confusion, agitation) prodrug--converted to acyclovir |
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Famciclovir
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Pro-drug--converted to penciclovir (similar to acyclovir)
used in short term tx of localized herpes zoster |
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Ganciclovir
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A GANG of CYCLES--HSV, VZV, CMV, EBV
more toxic than Acylovir but broader coverage (CMV!) SE: Reversible neutropenia & thrombocytopenia (careful if pt is on AZT) deoxyguanosine analogue Valganciclovir--ester prodrug--converts to ganciclovir |
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Foscarnet
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not an antimetabolite but still inhibits viral DNA and RNA polymerase
binds to pyrophosphate binding site reversibly but non-competetively (FOScarnet--pyroFOSphate analogue) Does not require activation by viral kinase Use: CMV retinitis & acyclovir resistant HSV infections. When used w/ ganciclovir--synergism SE: nephrotoxicity hypocalcemia--paresthesias, arrhytmias & seizures |
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Amantadine
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blocks viral penetration/uncoating (M2 protein--membrane ion channel)
(increases DA release-PD) "A MAN To DINE takes off his coat" USE: PD--increases dopamine & anticholinergic, prophylaxis and tx of infuenza A, Rubella SE: Ataxia, dizziness, slurred speech, livedo reticularis--discoloration of skin renal excretion-adjust if renal defect Resistance: mutated M2 Rimantadine--does not cross BBB--fever CNS SE. 4-10 X more active |
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Zanamivir
Oseltamivir |
Influenza A & B tx and prlxs
Inhibit influenza neuramidase--release of progeny virus is decreased via prevention of clumping of virus for better penetration SE: nausea & vomiting Zanamivir--wheezing, bronchospasm (not recommended for pt's w/ copd or asthma) |
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Ribavirin
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Inhibits IMP dehydrogenase leading to inhibition of guanine nucleotides
triphosphate form--inhibits viral RNA polymerase and end capping of viral RNA USE: respiratory syncytial virus Hep C (PO) Lassa fever (IV) measles pneumonitis influenza SE: Severe teratogen Hemolytic anemia |
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Interferons
alpha beta gamma |
INF alpha--Hep B & C,Kaposis, Hairy Cell Leukemia, Actinic Keratosis, Superficial Basal Cell Carcinoma, and External Genital Warts
INF beta--MS(inhibits the production of Th1 cytokines and the activation of monocytes) INF gamma--NADPH oxidase deficiency (chronic granulomatous disease) and osteopetrosis (marble bone disease-osteoclast/remodeling/ modeling defect SE: Flu-like symphtoms, Myelosupression, Neurotoxicity, autoimmune-e.g. thyroiditis interferon leads to upregulation of MHC I and therefore to increased presentation of viral peptides to cytotoxic CD8 T cells increases p53--apoptosis in virus infected cells T cells (cytotoxic and Th1) and Natural Killer cells secrete interferon gamma. Its major functions are to activate macrophages (they become angry macs) and to increase the expression of class II MHC on APC. |
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Rifampin
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Use: TB, leprosy (delays resistance to Dapsone when used w/ Rifampin),meningococcal & inluenza B prophylaxis
Inhibits DNA dependent RNA polymerase--blocks viral packaging and assembly SE: minor hep tox & drug interactions (revs up P450) 4 R's of Rifampin Rna polymerase inhibitor Revs up P450 Red/orange body fluids Rapid resistance if used alone 4 R's |
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Protease inhibitors
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HIV therapy--inhibits assembly of new virus by blocking protease in progeny virions
SE: GI intolerance, hyperglycemia, lipodystrophy, thrombocytopenia (indinavir) "navirs" --"Never (navir) tease a pro (pro-tease) Saquinavir Ritonavir Indinavir Nelfinavir Amorenavir Tipranavir |
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Reverse Transcriptase Inhibitors
Nucleosides |
Preferentially inhibit reverse transcriptase of HIV
SE: BM suppression, peripheral neuropathy, lactic acidosis, megaloblastic anemia (AZT-- zidovudine) pancreatitis (ddI) Zidovudine (AZT)- pyrimidine analogue Didanosine (ddI)- purine Stavudine- thymidine Zalcitabine Lamivudine (3TC)-cytosine (also used against Hep B) Abavir (ABC)-least toxic-rare fatal hypersensitivity rxn Tenovir- adenosine- 1/day dose Tenofovir--studied as a "pre-exposure prophylaxis" in high risk populations |
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Reverse Transcriptase Inhibitors
Non-Nucleosides |
preferentially inhibit HIV reverse transcriptase
--no phosphorylation needed for activity "NEVer Ever DELiver nuclosides" NEVirapine (NVP)-rash, SJ Efavirenz (EFV)-CNS SE (1/day) DELavirdine(DLV)-GI,rash SE: Rash, GI upset, CNS, (Steven-Johnsons & toxic epidermal necrolysis--NVP) metabolized by CYP3A Nevirpine & Efavirenz rev up P450 Delaviridine inhibits P450 (reduced levels when given w/ rifampin) |
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Fusion Inhibitors
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Entry Inhibitor (EI)
blocks entry of virus by binding to viral gp41 Enfuvirtide (Fuzeon) used in combo therapies SE: injection site rxn--administered subcutaneously 2X/day |
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HAART
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Highly active antiretroviral therapy
All patients with history of an AIDS-defining illness or severe symptoms of HIV infection regardless of CD4+ T cell count receive ART or if CD4 count is less than 350 a) 1 non-nucloside inhibitor + 2 nucleoside inhibitors b) 2 nucleoside inhibitors + 1-2 Protease inhibitor triple class regimens not recommended EI regimen--investigational c)three nucleoside inhibitors |
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Antivirals that block nucleic acid synthesis
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purine & pyrimidine analogs, RTI's
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Antivirals that block viral release
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neuraminidase inhibitors (influenza)
e.g. Zanamivir, Oseltamivir |