Week 3 Drug list Flashcards
Nucleoside Analogues MOA
Inhibit viral DNA synthesis by interfering with DNA polymerase
Valacyclovir Major ADR
Higher incidence of TTP/HUS in immunocompromised patients
Famciclovir MOA
Converted to penciclovir, Inhibits viral DNA synthesis
Paxlovid
Is a strong inhibitor of CYP3A4
Azoles are
Concentration-dependent antifungals that can be fungistatic or cidal
Azoles
Fluconazole
Itraconazole
Posaconazole
Voriconazole
Isavuconazole
Azole MOA
Reduce ergosterol production by inhibition of 14-ademethylase (Fungal CYP450)
Will cross the BBB
Azoles are
Fungicidal at Higher concentrations, fungistatic at lower concentrations
Fluconazole indications
Cryptococcus
Candida
Dematophytes
Fluconazole has less
Inhibition of CYP3A4 and 2C9 compared to other Azoles
Azole ADR
Hepatotoxicity- Use cautiously with hepatic impairment
QT prolongation
Ketoconazole ADR
Black Box hepatotoxicity- Can lead to death or liver transplant
Fluconazole dose should be reduced by
50% when CrCl<50ml/min
Itraconazole ADR
HF development
Use cautiously with preexisting HF/Vent dysfunction
voriconazole ADR
Visual Disturbances
Toxic Levels- neurological s/s
Hallucinations, confusion, agitation, myoclonus
Itraconazole DI
H2/PPI blockers
Itraconazole requires more acidic GI for absorption
These will reduce bioavaliability
Fluconazole Indications
Cryptococcus- Cryptococcal Meningitis
Candida-Vaginal
Dermatophytes
Azoles DI
All azoles are varying level inhibitors of CYP3A4
Itraconazole Indications
Histoplasmosis
Blastoplasmosis
Aspergillus
Posconazole Indication
Aspergillus
Posconazole Use
BMT prophylaxis
Posconazole DI
High fat meals, increase absorption
Voriconazole Indication
Broad spectrum: main treatment for invasive aspergillus
Fluconazole resistant candida- candidemia
Zygomyces
Allylamine
Terbinafine
Terbinafine MOA
Inhibition of squalene epoxide, preventing down chain formation of ergosterol
Terbinafine Cidal/Static?
Cidal against dermaphytes
Static against C albicans
Terbinafine Use
Approved for Onychomycosis
Terbinafine Metabolism
Lipophillic, Concentartion higher in stratum corneum
High first pass metabolism in liver enzymes other than CYP450
Terbinafine ADR
Hepatotoxicity
Antiethlmintics Classes
Benzimidazoles
Pryantel Pamoate
Ivermectin
Benzimidazoles
Mebendazole
Albendazole
Benzimidazole MOA
Bind to B-tubulin of microtubulin, inhibit mitosis/polymerization
Mebendazole Indication
Intestinal/tissue nematode
Mebendazole ADR
Hepatotoxic
Transient elevation of liver enzymes
BM suppression
Mebendazole DI
Carbamazipine
Phenytoin
Albendazole Indication
Tissue Nematode
Albendazole ADR
BM suppression
Pyrantel Pamoate MOA
Depolarizing Neuromuscular Blocker- Causes spastic paralysis of worm
Pyrantel Pamoate Indication
Intestinal Nematodes-Pinworm
Ivermectin MOA
Binds to glutamate gated channels, paralyze worm
Ivermectin Indications
Tissue Nematodes
Do not use for children <15kg
Ivermectin Metabolism
CYP450
Ivermectin ADR
Mazotti reaction (Urticaria, tender/swollen lympnodes - Use corticosteroids to treat
Metronidazole (Flagyl) MOA
Disrupts DNA/Protein synthesis by formation of free radicals that bind nonspecifically
Ketoconazole DI
Increased cyclosporine levels
Inhibition of testosterone- Gynecomastia/impotence
H2/PPI- Requires more acidic GI for absorption, these will reduce bioavailability
Voriconazole safe for prenat?
No, Category D
Voriconazole DI
H2/PPI- Requires more acidic GI for absorption. These will reduce bioavaliability
Metronidazole indication
Bacterial infections
Protozoal infections
Metronidazole ADME
Metabolism- CYP450
Renally eliminated
Metronidazole ADR
Seizure
Decreased plasma clearance with hepatic dysfunction
Metronidazole/Tinidazole DI
Warfarin- Reduced anticoag
Alcohol
Disulfiram- Psychotic reaction
Lithium/Disuldan- increased levels
Tinidazole MOA
Disrupt DNA/Protein synthesis by binding nonspecifically as free radicals
Tinidazole Indication
Trichomoniasis- T vaginalis, giardiasis
Bacterial Vaginosis- Intestinal amebiasis, amebic liver abcess
Tinidazole ADME
M- CYP3A4
E- In liver/urine (unchanged in urine)
Tinidazole ADR
Metallic taste
Isoniazid ADR
Black box- severe/fatal hepatitis
Zanamivir DI
Vaccines will NOT effect drug administration, good to use
Contraindicated with (milk protein allergy)
Ketoconazole Indications
Fungal infection
Prostate Cancer- inhibit testosterone production
Influenza Vaccine
Attenuated- Flumist (intranasal)
Inactive- IM
MMR Vaccine
Attenuated SQ
Influenza Vaccine DI
Aspirin- Reyes Syndrome
Influenza Vaccine CI
Live- Asthma, reactive airway, chronic pulm/CV, DM, Immunocompromised, Egg allergy, pregnant, <2yo
Inactive- Anaphylactic reaction to eggs, influenza
MMR Vaccine DI
Immunosuppressants
MMR Vaccine CI
Prior anaphylactic to MMR vaccine/neomycin/gelatin
Rotavirus Vaccine
Attenuated
Rotavirus Vaccine CI
Hx of Intussusception
Varicella Vaccine
Attenuated
Varicella CI
Neomycin/Gelatin hypersensitive
Immunocompromised
Pregnant
Diptheria/Tetanus/Pertussis Vaccine
Inactive
Dtap and Tdap
Dtap/Tdap CI
Anaphylaxis to first dose
Hep B Vaccine
Inactive
Hep B DI
Renal disease requiring HD/Fluids- may require higher dose of vaccine
Hep B CI
Hypersensitivity
HPV Vaccine
Inactive
HPV Vaccine CI
Allergy to components including yeast
Pneumococcal Vaccine
Inactive
Pneumococcal Vaccine Considerations
Give 10-14 days prior to elective splenectomy/organ tx/immunosuppressive therapy/chemo
Polio Vaccine
Attenuated-OPV (No longer used in the US)
Inactive (IPV)
Polio OPV CI
Type 1 rxn to previous dose
Neomycin/streptomycin hypersensitivity
Immunodeficiency
Risk of vaccine acquired paralytic poliomyelitis (VAPP)
Polio (IVP) CI
Neomycin/streptomycin, poymixin B
Hypersensitivity
CAN be given to immunosuppressed, HIV, pregnant, >6weeks
Meningococcal Vaccine
Inactive
Zoster Vaccine
Attenuated
Zoster Vaccine DI
Hold antivirals 24hours prior, 2 weeks after administration
Zoster Vaccine CI
Neomycin/Gelatin hypersensitivity
Immunocompromised, pregnant
Neruamidase Inhibitor MOA
Prevent enzyme from cleaving viral attachment from cell and spreading
Can be used to prevent spread in healthcare areas
Ritonavir MOA
HIV-1 protease inhibitor, inhibiting CYP3A4 metabolism of nirmatrelvir
Neuramidase Inhibitor’s work on
Influenza A and B
Paxlovid ADR
Anaphylaxis
Hepatotoxicity (Strong CYP3A inhibitor)
Hypertriglyceridemia
Vaccinated individuals will have
No different effect from neuramidase inhibitors
Drugs for Covid-19
Nirmatrelvir/Ritonavir (paxlovid)
Remdesivir (Veklury)
Remdesivir MOA
Prodrug, Converts to inhibit covid RNA dependent RNA polymerase
Neuramidase inhibitors
Zanamivir
Oseltamivir
Major ADR with Nucleoside Analogues
Renal Failure
Remdesivir ADR
Elevated liver enzymes
Hypersensitivity rxn
Nirmatrelvir MOA
Peptidomimetic inhibitor of main protease, preventing viral replication
Nuceloside Analogues MOA
Inhibit Viral DNA synthesis by interfering with DNA polymerase
Remdesivir DI
Chloroquine/Hydrochloroquine- Antagonist
Warfarin- May have reduced anticoagulation effect
Valacyclovir Major ADR
Higher incidence of TTP/HUS in immunocompromised patients
Famciclovir MOA
Converted to penciclovir, Inhibits viral DNA synthesis
Valacyclovir Is converted to
Acyclovir but has higher serum concentrations
Antivirals for Herpes are
Acyclovir
Famciclovir
Valacyclovir
Valacyclovir and Famciclovir are both
PRODRUGS