Antibiotics Flashcards
What antibiotics are bacteriostatic?
We're ECSTaTiC about bacteriostatics. Erythromycin Clindamycin Sulfamethoxazole Trimethoprim Tetracycline Chloramphenicol
What antibiotics are bactericidal?
Very Finely Proficient At Cell Murder Vancomycin Fluoroquinolones Penicillins Aminoglycosides Cephalosporins Metronidazole
Beta-lactam antibiotics inhibits what reaction?
Transpeptidation Reaction
What drugs are anti-pseudomonal?
TCP
Ticarcillin
Carbenicillin
Piperacillin
What are the 1st gen cephalosporins?
FADer, help me FAZ my PHarmacology boards! CeFADroxil CeFAZolin CePHalotin CePHapirin CePHadrin CePHalexin
What microbes are covered by 1st Gen Cephalosporins?
PEK 1st
Proteus mirabilis
E. Coli
Klebsiella pneumoniae
What microbes are covered by 2nd Gen Cephalosporins?
HEN PEK H. Influenzae Enterobacter aerogenes Neisseria spp Proteus mirabilis E. Coli Klebsiella pneumoniae
What drugs are classified under 2nd gen cephalosporins?
In a FAMily gathering, you see your FOXY cousin wearing FUR coat and drinking TEA. CeFAMandole CeFOXitin CeFURoxime CefoTEtan
FAC! Lora the PROfessional Azhole is still on the FONe! CeFAClor LORAcarbef CefPROzil CefmetAZOLE CeFONizid
Which Cephalosporin crosses the BBB?
CeFURoxime
What antibiotic drugs inhibit protein synthesis?
buy AT 30, CELLS at 50 Aminoglycosides Tetracyclines Chloramphenicol Erythromycin (Macrolides) Lincosamides (Clindamycin) Linezolid Streptogramins
Give an example of a streptogramin
Quinupristin-Dalfopristin
What is streptogramin used for?
Drug resistant gram+ cocci
MRSA, VRSA, VRE
Which antibiotics have post antibiotic effect?
Aminoglycosides
Fluoroquinolones
Which aminoglycoside has the narrowest therapeutic window?
Amikacin
Which antibiotic require Oxygen, thus will not work against anaerobic bacteria?
Aminoglycosides require O2 for transport
What is the mechanism of action of Tetracyclines?
Blocks attachment of T-RNA to acceptor site
All macrolides inhibit CYP450 except?
Azithromycin
Differentiate Clindamycin vs Metronidazole in terms of coverage in the body
Clindamycin for anaerobic infections above the diaphragm
Metronidazole for below the diaphragm
Give examples of Aminoglycosides and their side effects
Mean GNATS caNNOT kill anaerobes Gentamycin Neomycin Amikacin Tobramycin Streptomycin Side effects: Neuromuscular blockade Nephrotoxic Ototozic Teratogen
What is the dreaded side effect of Neomycin?
Hepatic Encephalopathy
Give 2 examples of antifolate antibiotics
Sulfonamides
Trimethoprim
What 2 drugs are considered most vestibulotoxic and nephrotoxic?
Gentamycin
Tobramycin
What antibiotic is considered most ototoxic?
Kanamycin and Amikacin
What enzyme is inhibited by Sulfonamides?
Dihydropteroate synthase
What enzyme is inhibited by Trimethoprim?
Dihydrofolate reductase
What abtibiotic cause kernicterus
Co-Trimoxazole and
Silver Sulfadiazine
What is the drug of choice for PCP pneumonia?
Co-Trimoxazole
What is another name for Topoisomerase II?
DNA gyrase
What is the histologic sign of Kernicterus?
Bilirubin deposits in subcortical nuclei and basal ganglia
What is the clinical presentation of kernicterus?
Hypo/hypertonia
Lethargy
High-pitched cry
Opisthotonos
What is the MOA of fluroquinolones against Gram - organisms?
Blocks Topoisomerase II and blocks relaxation of supercoiled DNA
Wha is the MOA of fluoroquinolones against gram + organisms?
Blocks topoisomerase IV and interferes with the separation of replicated chromosomal DNA during cell division
What are the 3 mechanisms of resistance against fluroquinolones?
Production of Efflux pumps
Changes in porin structure
Changed in sensitivity of the target enzymes via point mutations in the antibiotic binding regions
What is the dreaded side effect of Ciprofloxacin?
Tendonitis and Tendon Rupture
What drug enhances the toxicity of Ciprofloxacin?
Methylxanthines (Theophylline)
What fluroquinolone cause Diabetes?
Gatifloxacin
What fluoroquinolone cause hepatotoxicity?
Trovafloxacin
What 2 important side effects of Metronidazole?
Metallic Taste and Disulfiram reaction
Nitrofurantoin can be used for UTI except for these 2 microbes?
Proteus and Pseudomonas
Most important drug used in TB
Isoniazid
MOA of Isoniazid
Inhibits Mycolic Acid Synthesis
What should you administer to pxs taking Isoniazid to prevent neurotoxicity?
Pyridoxine (Vit B6)
What is the MOA of Rifampicin?
Inhibits DNA-dependent RNA polymerase
Describe Rifampicin
RNA polymerase inhibitor
Red-Orange Body fluids
Rapid development of resistance
Revs up CYP450 (inducer)
What is the known side effect of Ethambutol?
Causes Red-Green Color Blindness
What is the MOA of Ethambutol?
Inhibits Arabinosyl Transferases involved in the synthesis of arabinogalactan in mycobacterial cell wall
Most hepatotoxic Anti-TB Drug
Pyrazinamide
Also known as a sterilizing agent
Pyrazinamide
Which anti-TB drugs are hepatotoxic?
Isoniazid < Rifampicin < Pyrazinamide
What 2 drugs cause Methemoglobinemia?
Dapsone
Prilocaine
Drug used for sulfone resistant Leprosy
Clofazimine
Prophylactic drugs for Atypical Mycobacteria
Clarithromycin or Azithromycin with or without Rifabutin in patients with CD4 counts less than 50/L
Treatment for Atypical Mycobacteria
Azithromycin or Clarithromycin with Ethambutol or Rifabutin
Drug used for systemic fungal infections
Amphotericin B
Common side effects of Amphotericin B?
Infusion Reactions, Nephrotoxicity and RTA with Mg and K wasting
A pyrimidine metabolite used for Chromoblastomycosis (Madura Foot)?
Flucytosine
An azole used for Chromoblastomycosis (Madura Foot)?
Itraconazole
An azole used for chronic mucocutaneous candidiasis or dermatophytosis
Ketoconazole
Used as salvage therapy for Invasive Aspergillosis
Caspofungin
What is the MOA of Caspofungin?
Inhibits B-Glucan synthase decreasing fungal cell wall synthesis
Drug of choice for cryptococcal meningitis?
Fluconazole
What is the MOA of Griseofulvin?
Interferes with microtubule function
Inhibits synthesis and polymerization of nucleic acids
What is the MOA of Terbinafine?
Interfere with ergosterol synthesis by inhibiting fungal SQUALENE OXIDASE
What is Terbinafine used for?
Onychomychosis and Dermatophytosis
What is the MOA of Nystatin?
Binds to ergosterol in fungal cell membranes, forming artificial pores
How is Nystatin used?
SWISH and SWALLOW For Candidiasis (Oral, Esophageal, Vaginal)
Drug used for Pityriasis versicolor
Clotrimazole (topical)
Drug used against HSV-1 HSV-2 and VZV with activity
Acyclovir
What is the MOA of Acyclovir?
Activated by viral Thymidine kinase to forms that inhibit viral DNA polymerase
Drug of choice for CMV Retinitis?
Cifodovir
Drug used for HSV infections in patients with AIDS
Foscarnet
What is the MOA of Foscarnet?
Inhibits viral RNA polymerase, DNA polymerase and HIV reverse transcriptase by binding to PYROPHOSPHATE binding sites
What is the usual cocktail in HAART?
2 NRTI + 1 Protease inhibitor
Give examples of NRTIs
Zidovudine, Abacavir, Didabosine, Stavudinir and Zalcitabine
What is the side effect of Zidovudine?
Lactic acidosis with hepatic steatosis
Bone marrow suppression
What is the side effect Abacavir?
Hypersensitivity
What is the side effect Didanosine?
Pancreatitis
What is the side effect Stavudinr and Zalcitabine?
Peripheral Neuropathy
Give examples of NNRTIs
Delavirdine, Nevirapine, Efavirenz, and Etravirine
What is the side effect of Delavirdine and Nevirapine?
Rash
Increased ALT/AST
What is the side effect of Efavirenz?
Teratogenicity
What is the side effect of Etravirine?
Increased cholesterol and TGs
Give examples of Antiviral drugs that are protease inhibitors
Indinavir, Saquinacir, Atazanavir, and Amprenavir
What is the side effect of Indinavir?
Hyperbilirubinemia and Nephrolithiasis
What is the side effect of Saquinavir?
GI distress and diarrhea
What is the side effect of Atazanivir?
Peripheral Neuropathy
What is the side effect Amprenavir?
Rash
What is the MOA of Enfuvirtide?
Binds to gp41 subunit of viral envelope glycoprotein, preventing fusion of viral and cellular membranes
What is the MOA of Maraviroc?
Blocks viral attachment via transmembrane chemokine receptor CCR5
Give examples of drugs for Influenza virus
Amantadine/Rimantidine and Oseltamivir/Zanamivir
What is the MOA of Amantidine?
Inhibits early step replication and prevent uncoating by binding to M2 Protein Channels
What is the MOA of Oseltamivir?
Inhibitis Neuraminidase which decrease release of progeny virus
What is the known side effect of Amantadine?
Livedo reticularis
What other drugs cause Livedo Reticularis?
A Man reads fHM and GQ Amantidine Hydroxyurea Minocycline Gemcitabine Quinidine
What is the MOA OF interferon Alpha?
Degrades viral RNA via activation of host cell RNAse (ribonuclease)
Drug used for HBV HCV, Kaposi Sarcoma and Genital Warts
Interferon Alpha
What is the MOA of Lamivudine?
Inhibits HBV DNA polymerase
What is the MOA of Ribavirin?
Inhibits guanosine triphosphate formation
Prevents capping of viral mRNA
Blocks RNA-dependent DNA polymerase
Give 3 drugs for HBV and HCV
Interferon-alpha
Lamivudine
Ribavirin
What is the drug of choice for tissue schizonts?
Primaquine
1st line drug for non-falciparum malaria?
Chloroquine
What is the MOA of Chloroquine?
Prevents polymerization of heme into Hemozoin
Give examples of blood schizontocides
Chloroquine Quinine Mefloquine Halofantrine Artemsinin Doxycycline Sulfadoxine
Drug of choice for malaria in pregnant patients
Quinine
What drugs are used to combine with Quinine to prevent toxicities?
Doxycycline or Clindamycin
Chemoprophylaxis for chloroquine-resistant areas
Mefloquine
What is the known side effect of Quinine?
Cinchonism
What is Cinchonism?
Headache
Tinnitus
Vertigo
What 2 drugs should not be taken with milk?
Doxycycline
Tetracycline
Anti-malarial used for P. Ovale and P. vivax?
Primaquine
Treatment and prophylaxis for Chloroquine-resistant P. Falciparum?
Atovaquone-Proguanil (Malarone)
A blood schizontocide and sporonticide
Sulfadocine - Pyrimethamine (Sporonticide)
Chemoprophylaxis for multi-drug resistant malaria
Doxycycline
Drug of choice for severe falciparum malaria
Quinidine
Drug of choice for uncomplicated falciparum malaria in the Philippines
Co-Artem (Lumafentrine + Artemether)
What is the MOA of Artemether?
Forms toxic radicals in malarial food vacuole
What is the drug of choice for Asymptomatic Intestinal Amoebiasis?
Diloxanide Furoate
What is the drug of choice for severe intestinal and extraintestinal amoebiasis?
Metronidazole
What is the backup drug for severe intestinal and extraintestinal amoebiasis?
Emetine
Give 3 examples of Luminal Agents
Diloxanide furoate
Iodoquinol
Paromomycin
2nd line drug for asymptomatic amoebiasis?
Paromomycin
Drug of choice for PCP pneumonia
Co-Trimoxazole
Pentamidine (2nd)
Drug of choice for Toxoplasmosis
Pyrimethamine-Sulfadiazine
Drug of choice for Chagas Disease
Nifurtimox
Drug of choice for Cryptosporidiosis
Nitazoxanide
Drug of choice for West African Trypanosomiasis
Early: Pentamidine
CNS: Eflornithine
Drug of choice for East African Trypanosomiasis (early & CNS)?
Early: Suramin
CNS: Melarsoprol
Drug of choice for Leishmaniasis except in India
Sodium Stibogluconate
All cestodes are treated with ____ except ____?
Praziquantel
Echinococcus granulosus
What is the drug of choice for Echinococcus granulosus?
Albendazole
All trematodes are treated with ?
Praziquantel
What parasites can eradicate Ascaris, Necator, Ancylostoma and Capillaria?
Albendazole
Tx of Trichuris
Mebendazole
Tx for pinworm?
Pyrantel Pamoate
Tx for Strongyloides
Ivermectin
Tx for Wuchereria and Brugia (Filariasis)?
Diethylcarbamazine (DEC)
Tx for Trichinella
Thiabendazole
Which organs does Wichereria and Brugia affect?
Watch my scrotum Become Engorged
Wuchereria - Scrotum
Brugia - Elephantiasis
Drug of choice for Hydatid Disease
Albendazole
What procedure is used for Hydatid Disease?
PAIR procedure
Drug of choice for whipworm?
Mebendazole (Trichuris)
Alternative drug for cestode infections?
Niclosamide