antiparasiticantifungalanesthetics Flashcards
anti parasitic that has risk of optic neuritis with long term use
iodoquinol- due to dose related iodine toxicity
all of the luminal agents also come with mild GI upset
cryptosporidosis 1/2
- paromomycin (amino glycoside antibiotic)
eliminates trophosizes in liver abcess
chloroquine
back up drug for intestinal or hepatic amebas when no metronidazole
emetine/ dehydroemetine
DOC for invasive ameboas
metronidazole
followed by luminal
tinidazole is the new preference and better tolerated
Nitro group of acts as an electron acceptor à forming reduced cytotoxic compounds that bind to proteins and DNA, resulting in death of trophozoites.
Mixed Agents
Nitroimidazoles
- Metronidazole - Tinidazole
Not active against trophozoites
Converted in the gut to form amebicide
Luminal Agent
Diloxanide Furoate
Halogenated hydroxyquinoline – amebicidal; effective against the trophozoite and cyst forms
Luminal Agent
Iodoquinol
Aminoglycoside antibiotic; directly amebicidal, not significantly absorbed
Luminal Agent
Paromomycin
Prevents polymerization of heme->hemozoin Intracellular accumulation of heme is toxic to the parasite
Systemic Agent
Chloroquine
Blocks ribosomal movement along mRNA-> Inhibits protein synthesis
Systemic Agents
Emetine / Dehydroemetine
GI distress, rash, headache; auditory dysfunction and retinal dysfunction (high dose)
chloroquine
antifungalSevere toxicity, including gastrointestinal distress, muscle weakness, and cardiovascular dysfunction (arrhythmias and congestive heart failure)
Emetine / Dehydroemetine
alternative to antiparasitics for ameboicintestinal infection
intestinal infection: tetracycline
otherwise just stick with the formula mixed then luminal or the respective classes
giardia parasite tx 1/2
metro or nitazoxanide
GI sx
cryptosporidiosis parasite tx 1
nitazoxanide
GI sx
Trichimoniasis parasite tx
metro
(Trichomonas vaginalis)
cherry cervix
Trypanosoma brucei parasite tx
african sleeping sick
hematological = Suramin-east(r) / Pentamidine -west(g)
cns=melarosprol
lymph, int fever, sleep
Trypanosoma cruzi părăsite tx
and sx
American Trypanosomiasis - Chagas disease
Benznidazole Nifurtimox
megacolon, dilated cardiomyopathy, megaseophagus
leishmania parasite tx
Sodium Stibogluconate
Amphotericin B
Pentamidine[same as African west
intermittent fever, hepatosplenomegaly, pancytopenia, black fever
Toxoplasma gondii parasite tx
Pyrimethamine + Sulfadiazine OR
Pyrimethamine + Clindamycin
AND Leucovorin
chorioretinitis, hydrocephalus/seizures, intracranial calcifications, ring enhancing leasions
Primary Amebic meningoencephalitis
(Naegleria fowleri)
Amphotericin B
presents like meningoencephalitis with history of swimming
Babesiosis parasite
Atovaquone + Azithromycin
Inhibits microtubule synthesis & glucose uptake
Benzimidazoles
Albendazole Mebendazole Thiabendazole
reversible leukopenia, alopecia, elevated liver enzymes
others in this class and contraindications
albendazole
thiabendazole is more toxic than the others
not for pregnant and all can cause CNS disturbance
GABA agonist->causing enhanced Chloride influx-> hyperpolarization -> resulting in paralysis and death of the parasite
AE and contraindications
Ivermectin
-nematide
Mazotti-like reactions: fever, headache, dizziness, somnolence, and hypotension due to the killing of the microfilaria in onchocerciasis
The severity of this reaction is related to parasite load. Antihistamines or steroids may be given to improve the symptoms.
Contraindicated in pregnant women/
Avoid other drugs that enhance GABA activity, e.g., barbiturates, benzodiazepines, and valproic acid
Immobilizes microfilariae
Diethylcarbamazine
-nematode
Allergic reactions to proteins released by dying filariae include fever, rashes, ocular damage, joint and muscle pain, and lymphangitis.
Antihistamines or steroids may be co- administered minimize associated reactions.
Diethylcarbamazine and Ivermectan
Depolarizing, neuromuscular-blocker ->release of acetylcholine & acetylcholinesterase inhibition-> persistent activation of parasite’s nicotinic receptors-> paralysis and subsequent expulsion of the worm
Pyrantel Pamoate
Increases cell membrane permeability to calcium ->prolonged contraction & eventual paralysis of the worm musculature -> resulting in the detachment of suckers from the tissue wall
Praziquantel
Laxative should be administered prior to giving this drug orally, to purge bowel of all dead segments in order to preclude digestion & liberation of ova (may lead to cysticercosis); alcoholic consumption should be avoided within the 1st day of treatment
Niclosamide
leathal to on scolex but not ova
Inhibits mitochondrial phosphorylation of ADP & anaerobic metabolism of the parasite;
Niclosamide
Ascaris lumbricoides
round worm
Mebendazole OR Albendazole OR Pyrantel pamoate
sx: abd and resp
Necator americanus Ancylostoma duodenale
hook worm
Mebendazole OR Albendazole OR Pyrantel pamoate
itchy soles, gi, iron deficiency, malnutrition
Trichinella spiralis
Mebendazole OR Albendazole
+ Corticosteroids (severe infection)
orbital edema, five, muscle pain, vomitting
Trichuris trichuria
(Whipworm)
Mebendazole OR Albendazole
Enterobius vermicularis
(Pinworm)
Mebendazole OR Pyrantel pamoate
Strongyloides stercoralis
Ivermectin
Onchocerca volvulus
(River blindness)
Ivermectin
Loa-loa
(African eye worm)
Diethylcarbamazine
Wuchereria bancrofti Brugia malayi
(Lymphatic filaria)
Diethylcarbamazine
Schistosoma mansoni Schistosoma japonicum Schistosoma hematobium
Praziquantel
hematuria
portal hypertention
Clonorchis sinensis
(liver fluke)
Praziquantel OR Albendazole
Paragonimus westermani
(lung fluke)
Praziquantel
Taenia saginata
(Beef tapeworm)
Praziquantel Mebendazole Niclosamide
Taenia solium
(Pork tapeworm)
Praziquantel Niclosamide
Cysticercosis
(larval cyst of T. Solium)
Praziquantel Niclosamide
Diphyllobothrium latum
(Fish tapeworm)
Praziquantel
Echinococcus granulosus Echinococcus multilocularis
(Hydatid worm/ Dog tapeworm)
Albendazole
what are the three most common systemic fungal infections
candid
cryptococcus
aspergillosis
which antifungals:
1. disrupt microtubule fuctioning
2. disrupt nucleic acid synthesis
3. disrupt fungal cell wall
4. alter cell membrane permeability
- Griseofulvin
- Flucytosine
- echinocandidis/ capsofungin
- Alleles, allylamines polyenes
binds to ergosterol, forming
pores in the cell membrane.
* The pores allow leakage of intracellular ions and
macromolecules, leading to cell death
polyene, Amp B
preferred treatment for deep fungal infections during pregnancy
Amp B
INFUSION-RELATED TOXICITY
and other AE
amp B
\
Nearly universal. Fever and chills, muscle
spasms, vomiting, headache and hypotension..,. give antihistamine and steroids
**also binds to cholesterol causing renal toxicity eventually in all pts, prevent by loading sodium or by giving the lipid formulations!
Can cause anemia and electrolyte wasting
Intracranial administration can cause seizures
causes high level of nitrogen in the blood
amp B
Azotemia
what should be monitored if on amp B
should monitor renal
liver
electrolute(mg / K)
blood counts
Synthetic pyrimidine antimetabolite, Taken into fungal cells via the enzyme cytosine
permease then…
flucystosine
then becomes 5FU and blocks the synth of dTMP(inhibit DNA synth) and FUTP (inhibit protein synth)
ALWYAS USE WITH AMP B
Indicated only for serious infections caused by
susceptible strains of Candida and/or
Cryptococcus.
FLUCYTOSINE
and should be used with amp b always
flucytosine AE
makes 5 florouracil = bone marrow toxicity