Drugs Flashcards
5 major classes of antifungals
Polyenes, Azoles, Pyrimidines, Echinocandins, Allylamines
Which classes of antifungals act on cell membrane?
Polyenes, Azoles, Allylamines
Which class of antifungal act on cell wall?
Echinocandins
Which class of antifungal act on DNA?
Pyrimidines
Mechanism of polyenes
bind to ergosterol –> cell lysis
Polyenes (2)
Amphotericin B, Nystatin
Way of administration of Amphotericin B
IV
Empirical IV antifungal
Amphotericin B
Coverage of Amphotericin B (6)
Candida, Cryptococcus, Aspergillus, Mucoromycetes, Coccidiodes, Histoplasma
Side effects of Amphotericin B (4)
Renal toxicity, fever, n/v, phlebitis
Which antifungal requires close RFT monitoring?
Amphotericin B
Describe the renal toxicity of Amphotericin B (3)
- dose-dependent
- renal wasting of K, Mg, HCO3-
- renal tubular acidosis
Salt of original Amphotericin B
Amphotericin B deoxycholate
What is the formulation to reduce side effects of Amphotericin B?
Liposomal formulation
Nystain usage (way of administration) (3)
- Oral & oesophageal candidiasis (oral swish and swallow)
- Vaginal candidiasis (topical)
- Sclerosing agent (IV)
2 Types of Azoles
Imidazoles, Triazoles
Mechanism of Azoles
inhibit cytochrome-P450 dependent 14-demethylase –> stop conversion from lanosterol to ergosterol
Side effects of Azoles (2)
CYP450 inhibitor, Hepatotoxicity
Which classes of antifungal requires LFT monitoring? (2)
Azoles, Pyrimidines
Which 2 pathogens are intrinsically resistant to Azoles?
Candida glabrata, Candida krusei
Triazole with good CNS penetration and is used for long term treatment of Cryptococcal meningitis
Fluconazole
Antifungal with transient visual change as a common side effect
Voriconazole
Triazole that cover zygomycetes
Posaconazole
Antifungal with haematological suppression as side effect
5-flurocytosine
Antifungal that induces resistance rapidly if given as monotherapy (synergism with?)
5-flurocytosine, synergistic with amphotericin B
Way of administration of 5-Flurocytosine
oral
Echinocandins (3)
Caspofungin, Micafungin, Anidulafungin
卡士普 米卡 安妮杜拉
Way of administration of Echinocandins
IV (daily dose)
Mechanism and coverage (2, effect) of Echinocandins
inhibit 1,3 D-glucan synthase –> inhibit cell wall synthesis
Coverage: Candida (fungicidal), Asperigillus (fungistatic)
Antifungal class that is ineffective in UTI and CNS infections due to questionable penetration
Echinocandins
Allylamines (2)
Terbinafine, Naftifine
Mechanism of Allylamines
inhibit squalene monoxygenase –> inhibit ergosterol synthesis
Antifungals available as OTC nail lacquer
Amorolfine 阿莫羅芬, Ciclopirox
Why liposomal formulations of amphotercin B cannot be made manually?
risk of precipitation, instability
Which 2 non β lactams commonly cause C. difficile colitis?
Quinolones, Clindamycin
Which 3 non β lactams cause renal toxicity?
Glycopeptides, Aminoglycosides, Polymyxins
Which 2 non β lactams cause ototoxicity?
Aminoglycosides, Glycopeptides (rare)
Which non β lactam causes neuromuscular block as a rare side effect?
Aminoglycosides
Which non β lactam cause peripheral neuropathy and optic neuropathy?
Oxazolidinones
Which 2 non β lactams cause CNS toxicity?
Polymyxins, Quinolones (rare)
Which non β lactam causes teeth discoloration, depresses bone growth and thus is contraindicated in children <8y?
Tetracyclines
Which non β lactam causes cartilage injury and is thus contraindicated in children <16y?
Quinolones
Which 2 non β lactams cause thrombocytopenia?
Glycopeptides, Oxazolidinones (prolonged use)
Which non β lactam causes acute haemolytic anaemia?
Co-trimoxazoles
Which non β lactam causes aplastic anaemia, which could be fatal?
Chloramphenicols
Which 3 non β lactams can cross placenta and is thus terotogenic?
Aminoglycosides, Metronidazoles, Chloramphenicols
Which non β lactam causes red man syndrome?
Vancomycin
Which non β lactam cause photosensitivity and SJS?
Co-trimoxazoles
Which 2 non β lactams potentiate effects of Warfarin?
Ofloxacin, Metronidazoles
Side effects of Aminoglycosides (4)
nephrotoxicity, ototoxicity, neuromuscular block, terotogenic
Side effects of Linezolid (3)
thrombocytopenia, peripheral neuropathy, optic neuropathy
Side effects of Tetracyclines (2)
Teeth discoloration, depress bone growth
Side effects of Septrin (3)
Acute haemolytic anaemia, photosensitivity, SJS
Side effects of Vancomycin (4)
nephrotoxicity, ototoxicity (rare), neutropenia & thrombocytopenia, red man syndrome
Which non β lactam causes tendinopathy?
Quinolones
Side effects of Quinolones (6)
GI distress, C. difficile colitis, cartilage injury, tendinopathy, CNS toxicity, arrhythmia
Side effects of Polymyxins (2)
nephrotoxicity, CNS toxicity
Side effects of Chloramphenicals (2)
aplastic anaemia, terotogenic
Side effect of Spectinomycin
discomfort at injection site
Mechanism of Glycopeptide
bind D-ala-D-ala tail –> stop elongation fo peptidoglycan
Usage of vancomycin
[IV] MRSA systemic infection
[oral] C. difficile colitis
Which 2 non β lactam have post-antibiotic effect?
Aminoglycosides, Quinolones
Mechanism of Aminoglycosides
cause misreading of mRNA –> - protein synthesis
Glycopeptides (2)
Vancomycin, Teicoplanin
Aminoglycosides (5)
Streptomycin, Gentamicin, Amikacin, Netilmicin, Neomycin
Which Aminoglycoside is available in topical, eye drops, and oral form?
Neomycin
Which Aminoglycoside has the least ototoxicity?
Netilmicin
Mechanism of Linezolid
inhibit protein sythesis initiation
Usage of Linezolid
MRSA infection in vancomycin failure / allergy