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Antiviral HIV Pharm

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Question
Answer
Life cycle of HIV ?   * binds to CD4+ or CCR5 --> into membrane --> reverse transcrition to make DS DNA --> put RNA in to be into cells  
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Antiretroviral drug classes ?   * Nucleoside analogs (NRTIs or nukes) ----Nonnucleoside reverse transcriptase inhibitors (NNRTIs or non-nukes) ----Protease inhibitors (PIs) ----Integrase inhibitors ----Fusion inhibitors ----Entry inhibitors – CCR5 antagonists  
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Usu initial combo ?   * 2 nukes + 1 PI or II or NNRTI  
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Nucleoside analogs ?   * Lamivudine ---Zidovudine (AZT) ---Stavudine ---Didanosine  
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Protease Inhibitors (PIs) ?   * Ritonavir (RTV) ---Indinavir ---Fosamprenavir ---Nelfinavir ---Saquinavir  
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Nonnucleoside RT Inhibitors (NNRTIs) ?   * Efavirenz* ----Nevirapine  
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Fusion inhibitor ?   * Enfuvirtide  
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Entry Inhibitor – CCR5 antagonist ?   * Maraviroc  
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Integrase inhibitor ?   * Raltegravir  
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Nucleoside analog MOA ?   * incorporates itself as a triphosphate in to the viral DNA to stop viral replication  
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Nucleoside analogs Side Effects ?   * minimal drug/drug interactions..... * Black Box Warning --> Lactic acidosis with hepatic steatosis ...... * Zidovudine - bone marrow depression = anemia  
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Preferred in pregnant pts ?   * Zidovudine  
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Nonnucleoside Reverse transcriptase Inhibitors (NNRTIs) MOA ?   * Same target….but binds to unique site that causes a confirmational change in enzyme so it doesn't work ..... * Bind directly to HIV-RT and are direct acting  
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NNRTIs – Advantages ?   * Efavirenz - 1 pill a day..... * Nevirapine - safe in pregnancy  
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NNRTIs – Disadvantages ?   * Efavirenz - neuropsych effects, teratogenic,use p450, tons of drud/drug interactions ..... * Nevirapine - hypersensitivity rash and hepatitis  
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Protease inhibitors MOA ?   * Competitive inhibition of viral protease, Preventing immature virions from becoming mature  
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Addition of ritonavir to Lopinavir ?   * makes Lopinavir a multiple dose a day drug to a one day dosed.... RTV is often used with other PIs to boost them  
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PI Drug Interactions ?   * Eliminated by hepatic metabolism (CYP3A4) so watch in using other drugs that inhibit or induce it  
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Toxicity of PIs ?   * GI issues , hepatotoxicity , lipodystroophy (moves fat to other places) , hyperlipidemia , and insulin resistance  
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Integrase inhibitor MOA ?   * Blocks HIV integrase from inserting viral genome into host cell DNA..... *given injection SubQ  
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Fusion inhibitor MOA ?   * Blocks the entry of HIV-1 into CD4+ cells. ---Binds gp41 subunit HIV envelope glycoprotein  
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Fusion inhibitor Side Effects ?   * * Also see little wasp sting reactions where it is injected  
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Entry inhibitor MOA ?   * Binds CCR5 and blocks the HIV gp120 from associating with the receptor. HIV is then unable to bind and enter cells .... * need to do receptor tests bc if HIV binds to other ones, this drug won't work, only on CCR5......  
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