antimicrobials

antimicrobal therapy

Penicilin G,V

prototype β-lactam antibody

bind penicillin-binding protein, block transpeptidase cross-linking of peptidoglycan in cell wall

G: IV or IM; V: oral

used for gram+ organism(S.pneumoniae, S.pyogenes, Actinomyces), gram- cocci(N.meningitis) and spirochetes

β-lactamase sensitive

adverse: coombs+ hemolytic anemia, interstitial nephritis

resistance: β-lactamase, mutation in penicillin-binding protein

penicillinase-sensitive penicillins

amoxicillin, ampicillin

similar to penicillin, wider spectrum, with clavulanic acid to protect against β-lactamase

H.influenzae, H.pylori, E.coli, Listeria monocytogenes, Proteus mirabilis, Salmonella, Shigella

adverse: hypersensitivity, rash, pseudomembranous colitis

resistance: penicillinase

penicillinase resistant penicillin

dicloxacillin, nafcillin, oxacillin

similar to penicillin, narrow spectrum

S.aureus

adverse: hypersensitive reaction, intestinal nephritis

MRSA has altered penicillin-binding protein site

antipseudomonal penicillins

β-lactamase inhibitor

clavulanic acid, avibactam, sulbactam, tazobactam

cephalosporin

β-lactam, inhibit wall synthesis, less susceptible to penicillinase

Listeria, Atypical(chlamydia, mycoplasma), MRSA, Enterococci are not covered

1st-generation(cefazolin, cephalexin): gram+ cocci, Proteus mirabilis, E.coli, Klebsiella pneumoniae

2nd-generation(cefaclor, cefoxitin, cefuroxime, cefotetan): gram+ cocci, H.influenzae, E.aerogenes, Neisseria spp., Serratia, E.coli, Klebsiella

3rd-generation(ceftriaxone, ceftaxine, cefpodoxime, ceftazidime): gram- resistant to other β-lactam

4th generation(cefepime): gram-

5th generation(ceftaroline): broad, cover Listeria, MRSA, Enterococcus faecalis

adverse: hypersensitivity, AIHA

resistance: inactivated by caphalosporinase, structual change

carbapenem

doripenem, imipenem, meropenem, ertapenem

wide apectrum and significant side effect

limit use to life-threatening

adverse: GI distress, rash, CNS toxicity

monobactam

aztreonam

less susceptible to β-lactamase

prevent cell wall synthesis by binding protein 3

gram - only, for penicillin-allergic patient, those wtih renal insufficiency

adverse: nontoxic, GI upset

vancomycin(グリコペプチド系)

inhibit cell wall synthesis by binding D-Ala-D-Ala portion of cell wall precursors, not susceptible to β-lactamase

gram+, serious, multidrug-resistant drug

adverse: nephrotoxicity, ototoxicity, thrombophlebitis(血栓静脈炎), redman syndrome(diffuse flushing), DRESS syndrome(eosinophilia, systemic symptom)

protein synthesis inhibitors

basic

30S: aminoglycoside, tetracycline

50S: chloramphenicol, clindamycin, erythromycin, linezolid

target ribosome(70S, made of 30S and 50S)

aminoglycoside

gentamicin, neomycin, amikacin, tobramycin, streptomycin

binding 30s of ribosome, require O₂ (ineffective against anaerobic)

severe gram - rod

adverse: nephrotoxicity, neuromuscler blockade, ototoxicity, teratogen

tetracycline

glycylcycline

macrolide

chloramphenicol

clindamycin

oxazolidinone

bind to 30S, prevent attachment of aminoacyl-tRNA

tetracycline, doxycycline, minocycline

do not take with milk, antacid, iron-containing preparation

M.pneumoniae, Rickettsia, Chlamydia, MRSA(dexycycline), acne

discoloration of teeth and inhibitation of bone growth in children, contraindicated in pregnancy, doxycycline has no nephrotoxicity

tigecycline

bind to 30S

block peptide transfer to 50S

used to treat meningitis, rickettsial disease, toxicity

adverse: anemia, aplastic anemia, gray baby syndrome

block peptide transfer to 50S

linezolid

bind to 23S rRNA of 50S ribosomal subunit

polymyxin

multi-drag resistant gram- bacteria

binding to 50S

gram+ including MRSA and VRE

adverse: bone marrow suppression, peripheral neuropathy, serotonin syndrome

atypical pneumonia, STIs, gram+ cocci

adverse: gastrointestinal motility issues, arrhythmia, acute colestatic hepatitis, rash, eosinophilia

azithromycin, clarithromycin, erythromycin

nephrotoxity, neurotoxity, respiratory failure

bind to phospholipid, disrupt cell membrane→leakage of cellular component→cell death

colistin, polymyxinB

核酸合成阻害

PABA+ Pteridine

dihydropteroic acid

dihydrofolic acid

tetrahydrofolic acid

thymidine

methionine

purines

DNA, RNA

DNA

protein

trimethoprim

fluoroquinolones(ニューキノロン)

dapsone(ジアフェニルスルフォン)

daptomycin

sulfonamides

metronidazole

inhibit dihydropteroate synthase; thus inhibit folate synthesis

gram+, -, Nocardia, TMP-SMX for simple UTI

sulfamethoxazole(SMX), sulfisoxazole, sulfadiazine

adverse: hypersensitivity reaction, nephrotoxicity, kernicterus in infant

similar to sulfonamide

leprosy, pneumocystis jirovecii prophylaxis

methemoglobinemia

inhibit dihydrofolate reductase

hemolysis in G&PD deficiency

combination with sulfonamides(TMP-SMX) used for UTIs

adverse: megaloblastic anemia, leukopenia, granulocytopenia

ciprofloxacin, enoxacin, norfloxacin, pfloxacin; respiratory: gemifloxacin, levofloxacin, moxifloxacin

inhibit topoisomerase2, 4

must not be taken with antacids

gram - rod of urinary and GI tract, some gram+, otitis externa

adverse: GI upset, superinfection, skin rash, headache, dizziness, contraindicated in pregnant women, nurshing(授乳中) mothers, and children (damage to cartilage), tendonitis, tendon rupture

disrupt cell membrane

form toxic free radical metabolite

S.aureus skin infection, bacteremia, endocarditis, VRE

adverse: myopathy, rhabdomyolysis(横紋筋融解症)

giardia, entamoeba, trichomonas, gardnerella vaginalis, anaerobe

can be used in place of amoxicillin in H.pylori in case of penicillin allergy

adverse: disulfiram-like reaction(アルデヒド蓄積により悪酔い)

antimycobacterial drug

use

ethambutol

streptomycin

M avium-intracellulare(非結核性抗酸菌): azithromycin, rifabutin (prophylaxis); azithromycin or clarithromycin + ethambutol (treatment)

M.leprae: dapsone and rifampin (treatment)

M.tuberculosis: isoniazid (prophylaxis); rifampin, isoniazid, pyrazinamide, ethambutol (treatment)

inhibit 30S ribosome

rifamycin

isoniazid

pyrazinamide

rifampin, rifabutin

↓carbohydrate polymerization of cell wall

mycobacterium tuberculosis

inhibit DNA-dependent RNA polymerase

mycobacterium tuberclosis, leprosy

adverse: hepatotoxicity, red orange body fluid

rifabutin favored in HIV infection (less cytochrome P-450 stimulation)

mycobacterium tuberculosis

hepatotoxicity, P-450 inhibition, SLE, acidosis, vitB6 deficiency

↓synthesis of mycolic acid (cell wall element)

mycobacterium tuberculosis

adverse: optic neuropathy

mycobacterium tuberculosis(second line)

tinnitus, vertigo(回転性めまい), ataxia, nephrotoxicity

prophylaxis

pregnant woman carrying group B strep: penicillin G or ampicillin

syphilis: benzathine penicillin G

postsurgical infection of S.aureus: cefazolin

high risk for endocarditis, undergoing surgical or dental procedure: amoxicillin

UTIs: TMP-SMX

gonococcal conjunctivitis: erythromycin

meningococcal infection: ceftriaxone, ciprofloxacin, rifampin

gonorrhea: ceftriaxone

strep pharyngitis(連鎖球菌咽頭炎) in child with prior rheumatic fever: benzathine penicillinG or oral penicillin V

for HIV patient

CD4<100: TMP-SMX: pneumocystis pneumonia and toxoplasmosis

CD4<50: azithromycin, clarithromycin: mycobacterium avium complex

CD4<200: TMP-SMX: pneumocystis pneumonia

to highly resistant bacteria

MRSA: vancomycin, daptomycin, linezolid, tigecycline, ceftaroline, doxycycline

VRE: linezolid, streptogramins(quinupristin, dalfopristin)

multidrug-resistant P aeruginosa, Acinetobacter baumannii: polymyxin B, E

antifungal/parasito therapy

antithelminthic therapy

antiprotozoal therapy

anti-mite/louse therapy

terbinafine

chloroquine

griseofulvin

amphotericinB

flucytosine

echinocandins

azoles

nystatin

adverse: fever, hypotension, nephrotoxicity, arrhythmias, anemia, IV plhebitis(静脈炎)

supplement K⁺ and Mg⁺

cryptococcus, blastomyces, coccidioides, candida, mucor

bind ergosterol and form membrane pore

same as amphotericinB, too toxic

oral candida, diaper rash or vaginal candidiasis

inhibit RNA and DNA synthesis

in combination with amphotericinB

clotrimazole, fluconazole, isaconazole, ketoconazole, miconazole, vericonazole

inhibit fungal sterol synthesis by inhibiting cytochrom P-450

fluconazole to cryptococcal meningitis in AIDS and candidal infection; itraconazole to blastomyces, coccidioides, histoplasma; voriconazole for aspergillus and some candida; isavuconazole for serious aspergillus and mucor

adverse: testosterone synthesis inhibition, liver dysfunction

inhibit fungal enzyme squalene epoxidase

anidulafungin, caspofungin, micafungin

interfere with microtubule function; disrupt mitosis

block detoxication of heme into hemozoin

for dermatophytoses(皮膚糸状菌症)

adverse: GI upset, headache, hepatotoxicity, taste disturbance

inhibit cell wall synthesis by inhibiting synthesis of β-glucan

for invasive aspergillosis, candida

adverse: GI upset, flushing

oral, inhibit growth of dermatophytes

adverse: teratogenic, carcinogenic, etc

plasmodial species other than P.falciparum

treat P.falciparum with artemether/lumefantrine and atovaquone/proguanil, if life-threatening, use quinidine

adverse: retinopathy, pruritus

pyrimethamine (toxoplasmosis); suramin and melarsoprol(trypanosoma brucei); nifurtimox (T. cruzi); sodium stibogluconate (leishmaniasis)

permethrin, malathion, lindane

pyrantel pamoate, ivermectin, mebendazole, praziquantel, diethylcarbamazine

antiviral therapy

oseltamivir/ zanamivir

inhibit influenza neuraminidase→↓release of progeny virus

both influenza A and B

acyclovir/ famciclovir/ valacyclovir

guanosine analog, monophosphorylated by HSV/VZV thymidine kinase→few adverse effect, inhibit DNA polymerase

HSV, VZV, weak activity against EBV

valacyclovir is a prodrug of acyclovir, have better oral bioavailability

adverse: renal failure, neuropathy

ganciclovir

guanosine analog, 5'-monophosphate formed by CMV viral kinase, inhibit viral DNA polymerase

CMV

valganciclovir is a prodrug

adverse: bone marrow supression, renal toxicity

foscarnet

viral DNA/RNA polymerase inhibitor and HIV reverse transcriptase inhibitor

for CMV retinitis (when ganciclovir fails), acyclovir-resistant HSV

adverse: nephrotoxicity, electrocyte abnormalities, seizure

cidofovir

inhibit viral DNA polymerase

CMV, HSV

adverse: nephrotoxicity

HIV therapy

3 drugs; 2 NRTIs and an integrase inhibitor

NRTIs

highly active antiretoroviral therapy(HAART)

NNRTIs

protease inhibitor

integrase inhibitor

inhibit nucleotid binding to reverse transcriptase

zidovudine is used during pregnancy

adverse: bone marrow suppression, lactic acidosis, anemia, pancreatitis

abacavir, didanosine, emtricitabine, lamivudine, stavudine, tenofovir, zidovudine

delavirdine, efavirenz, nevirapine

inhibit reverse transcriptase

rash, hepatotoxicity

atazanavir, darunavir, fosamprenavir, indinavir, lopinavir, ritonavir, saquinavir

HIV-1 protease (cleave polypeptide into functional part) inhibitor

hyperglycemia, GI intolerance, lipodystrophy(脂肪異栄養症), nephropathy, hematuria, thrombocytopenia

dolutegravir, elviteravir, raltegravir

inhibit integration

fusion inhibitor

enfuvirtide: bind at gp41, inhibiting entry

bind CCR5 on Tcell or monocyte, inhibiting interaction with gp120

interferon

adverse: flu-like, depression, neutropenia, mopathy

chronic HBV and HCV, Kaposi sarcoma, hairly cell leukemia, condyloma acuminatum, renal cell carcinoma, melanoma, multiple sclerosis, CGD

disinfection and sterilization(殺菌)

hepatitis C therapy

combination of drugs; ledipasvir(phosphoprotein inhibitor), ribavirin(inhibit synthesis og guanine nucleotide), simeprevir(HCV protease), sofosbuvir(inhibit HCV RNA-dependent RNA polymerase)

autoclave, alcohol, chlorhexidine, chlorine, hydrogen peroxide, iodine and iodophors, quaternary amine

avoid in pregnancy

clarithromycin: embryotoxic

tetracycline: discolored teeth, inhibition of bone growth

fluoroquinolones: cartilage damage

ribavirin: teratogenic

amynoglycosides: ototoxicity

griseofulvin: teratogenic

sulfonamides: kernicterus(核黄疸)

chloramphenicol: gray baby syndrome