dose Flashcards

1
Q

urine culture for

A

complicated UTI
1) Preg
2) Recurrent UTI (relapse within 2wks/ freq)
3) Pyelonephritis
4) Catheter-associated Uti
5) MEN with UTI

NOT: uncomplicated cystitis/ ASB

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2
Q

uncomplicated cystitis first liness

A

fosfomycin 3g (1dose)
nitrofurantoin 50mg QDS (5d)
CMX 960mg BD (3d)

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3
Q

uncom cys 2nd line

A

beta-lactams 5-7d
amox-clav 625mg BD
cefuroxime 250mg BD
cephalexin 250mg QDS

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4
Q

pen allergy uncom cys

A

FQ 3d
ciprofloxacin 250mg BD
levofloxacin 250mg OD

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5
Q

uncomplicated pyelo PO

A

PO CMX 960mg BD (10-14d)
PO cipro 500mg BD (7d)
PO levo 750mg OD (5d)

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6
Q

severely ill pyelo IV

A

IV cipro 400mg BD
IV amoxicillin-clav 1.2g TDS +/- gentamicin 5mg/kg/d
IV cefazolin 1g TDS +/- gentamicin 5mg/kg/d

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7
Q

uncomplicated pyelo beta-lactams

A

10-14d
amox-clav 625mg TDS
cefuroxime500mg BD
cephalexin 500mg QDS

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8
Q

complicated cystitis

A

fosfomycin 3g (EOD 3dose)
nitrofurantoin 50mg QDS (7-14d)
CMX 960mg BD (7-14d)

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9
Q

risk of prostatitis, men with pyelo

A

PO CMX 960mg BD (10-14d)
PO ciprofloxacin 500mg BD (10-14d)

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10
Q

HAI-UTI risk factors

A

UTI after >48hr hospitalisation

Pt hosp last 6mnths

Invasive urological procedure last 6mnths

Indwelling urine catheter

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11
Q

HAI-Pyelo PO

A

PO cipro 500mg BD (7-14d)
PO levo 750mg OD (7-14d)

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12
Q

HAI-Pyelo IV
M4

A

IV meropenem 1g TDS
IV imipenem 500mg QDS
IV cefepime (2g BD) +/- amikacin 15mg/kg/d

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13
Q

Catheter-UTI PO

A

PO CMX 960mg BD (3d)
PO levofloxacin 750mg OD (5d)

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14
Q

PO CMX for CAT UTI when

A

Treat of women PO CMX:

</= 65 y/o CA-UTI

without upper UTI symptoms -

after removal of catheter

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15
Q

cat-UTI IV

ML4

A

IV levo 750mg OD (7d)
IV meropenem 1g TDS (7d)
IV imipenem 500mg QDS (7d)
IV cefepime (2g BD) +/- amikacin 15mg/kg/d (7d)

(7d. defeverse in 72hrs. 10-14d if delayed response)

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16
Q

symptomatic relief UTI

A

Phenazopyridine 100-200mg TDS

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17
Q

impetigo (staph, strep)

A

TOP muciporin BD 5d

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18
Q

ecthyma – strep A

A

(7d)
PO cloxacillin 500mg QDS
PO cephalexin 500mg QDS

MSSA: cloxacillin, cephalexin, clindamycin

S.pyogenes: pen V 500mg BD, amoxicillin 500mg TDS

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19
Q

PURULENT SSTI, MILD, MOD, SEVERE CLASSIFICATION

A

MILD -

MOD - systemic sx

SEVERE - age, immunosupp, more severe systemic, failed I&D

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20
Q

PURULENT SSTI – staph aureus, grp B strep

MILD

A

(5-10d)
MILD: I&D + warm compres

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21
Q

PURULENT SSTI – staph aureus, grp B strep

MODERATE

A

MOD: I&D + PO cloxacillin 500mg QDS, cephalexin 500mg QDS, PO clindamycin 300-450mg QDS

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22
Q

PURULENT SSTI – staph aureus, grp B strep

SEVERE

A

SEVERE: I&D + IV cloxacillin 500mg-1g QDS, IV cefazolin 1-2g TDS, IV clindamycin 600mg TDS, IV vancomycin 15mg/kg Q8-12H

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23
Q

PURULENT SSTI ADD-ONS COVER FOR___

A

CA MRSA: doxy (100mg BD), clindamycin (300-450mg QDS), CMX 960mg BD

HA MRSA: IV vancomycin 15mg/kg Q8-12H, daptomycin 4-6mg/kg/d, linezolid 600mg BD

ANAEROBE: amox-clav 625mg TDS

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24
Q

CA MRSA

A

Contact (sports, military, IV drug abuse, prison)

Overcrowded facilities, close contact, lack sanitation

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25
HA MRSA
MRSA infection/colonization in last 12 months prolonged/repeated hospital stay in the last 12 months, hemodialysis.
26
anaerobe, GN bacilli
skin abscess in perioral/ perirectal/ vulvovag area
27
risk factors for less common pathogen in non purulent
Aeromonas, vibrio vulnificus, pseudomonas with water exposure
28
what classify as MILD, MOD, SEVERE NON-PURULENT SSTI
mild: no systemic sign mod: systemic signs + purulence *MSSA cover severe: systemic sign of infeciton, failed PO, immunocompromised. * broader coverage, necrotising infection
29
NON-PURULENT SSTI MILD
(5-10d, 14d for immunocomp) MILD (strep pyogenes) PO pen V 250mg QDS PO cephalexin 500mg QDS Po cloxacillin 500mg QDS Po amoxicillin 500mg TDS PO clindamycin 300-450mg QDS
30
NON-PURULENT SSTI MOD (MSSA)
(MSSA cover): IV cefazolin 1-2g TDS IV clindamycin (600mg TDS)
31
NON-PURULENT SSTI SEVERE (necrotising, anaerobe cover): MP4
IV meropenem 1g TDS IV imipenem 500mg QDS IV pip-tazo 4.5mg IV TDS IV cefepime 2g TDS
32
ADD-ONS FOR NON-PURULENT SSTI
+/- MRSA: IV vancomycin 15mg/kg Q8-12H daptomycin 4-6mg/kg/d, linezolid 600mg BD
33
common DFI bact
staphylococcus aureus streptococcus spp
34
GN bacilli eg and when to tx
e.coli, kleb spp, proteus spp, pseudo less common Gram neg bacilli (chronic wounds, previous tx with AB)
35
anerobes in DFI when
peptostreptococcus spp, veilonella spp, bacteriodes spp Anaerobes (ischemia, necrotising wound)
36
pseudo cover in DFI
Warm climate, exposure to water Empiric cover ( for severe infection// failure of Abx)
37
DFI/ PU (staph aures, strep spp) MILD
1-2wks if no bone involved PO cloxacillin 500mg QDS, POcephalexin 500mg QDS PO clindamycin (300-450mg QDS)
38
MILD DFI MRSA
if MRSA USE INSTEAD: PO doxy (100mg BD), clindamycin (300-450mg QDS), CMX 960mg BD
39
DFI MOD (AXONE) strep, staph aureus, GN (+/- pseudo) , anaerobes
1-3wks if no bone involved IV ampicillin-clav 1.2g TDS IV ceftriaxone (1-2g OD-BD)+ metronidazole (500mg TDS) IV cefazolin (1-2g TDS) + metronidazole (500mg TDS)
40
DFI SEVERE MPC3,4 strep, staph aures, GN (pseudo), anaerobe
SA, strep, GNB, anaerobe 2-4wks if no bone involved IV meropenem (1g TDS) IV imipenem (500mg QDS) IV pip-tazo (4.5g TDS) IV Ciprofloxacin (400mg BD)+ IV clindamycin (600mg TDS) IV cefepime (2g TDS)+ IV metronidazole (500mg TDS)
41
DFI MOD / SEVERE + MRSA
IV vancomycin 15mg/kg Q8-12H daptomycin 4-6mg/kg/d linezolid 600mg BD
42
bone involvement duration
amputate 2-5 days residual soft tissue 1-3wk residual viable bone 4-6wk no surgery/ residual dead bone > 3mnths
43
common cold
self-limiting 7-10 days post-nasal drip 2-3wks. feel better in 3-4d, but sx linger
44
influenza risk of complications in
Child <5// elderly >65 Preg/ 2wks post-partum Nursing homes/ LT care Obese BMI > 40kg/m2 Chronic medical conditions Asthma, COPD, HF, DM, CKD, immunocompromised
45
influenza
PO oseltamivir 75mg BD (5d)
46
pharyngitis - strep pyogenes PAZI 1
(10d, sx 1-2d) pen V 250mg QDS amox 500mg BD cephalexin 500mg BD azithromycin 500mg OD (5d) clarithromycin 250mg BD clindamycin 300mg TDS
47
modified centor criteria
FLECA fever, swollen lymph, exudate tonsils, no cough, 3-14 yrs >2 pts throat test for Grp A strep
48
prevent what with Abx tx in pharyngitis
Acute rheumatic fever Prevented with early initiation of effective AB Acute glomerulonephritis Not prevented by AB
49
when to treat rhinosinusitis
=/>1 1) Symptoms persists > 10 days w/o clinical improvement 2) Symptoms severe - Fever > 38*C - Purulent nasal discharge - Facial pain > 3 days consecutive 3) Symptoms worsen after initial improvement *double sickness! (improve for 3 days or worsen (5-6 days) -New-onset fever -Headache -Incr nasal discharge
50
rhinosinusitis - strep pneumo, h influ MALA2
(5-7d course, but 7-10d to improve) cefuroxime 500mg BD amox 500mg TDS amox-clav (h.influ) 625mg TDS moxi 400mg OD (5-7d) levo 500mg OD (5-7d)
51
incr strep pneumo resistance (change in PBP) cannot use which Abx
CMX MACROLIDES TETRACYCLINES use amox high dose
52
bronchitis
self limit in 3wks, Abx does not resolve cough
53
LRTI duration
CAP: 5d min, 48-72hr for clinical stability elderly take longer, do not escalate in 72hrs 7d: risk MRSA, PSEUDO 3-6wk: burk 6mn TB HAP/VAP: 7 day min 48-72hr clinical stability, delay 4-5d if comorbidities
54
CAP outpt, no comrbities -- strep pneumo
PO amoxicillin 1g TDS PO levo 750mg OD (5d)
55
comorbities
Chronic heart, lung, liver, renal disease DM Alcoholism Malignancy Asplenia
56
CAP outpt, comorbities -- strep pneumo, H influ, atypicals 3 classes
beta-lactams PO amoxicillin 1g TDS PO cefuroxime 500mg BD + macrolides clarithromycin 500mg BD azithromycin 500mg OD DOXYCYCLINE 100mg BD OR: PO levofloxacin 750mg OD
57
Pre-treatment blood and resp gram-stain and culture for pt in hosp:
* Severe CAP * Risk factors for drug-resistant pathogens (MRSA, pseudo) 1) Being empirically tx for MRSA, pseudo (VAP/ HAP) 2) Previously infected with MRSA or Pseudo in last 1 year 3) Hosp or IV Abx in last 90d
58
CAP non severe inpt -- strep pneumo, H influ, atypicals, INFLUENZA
beta-lactams PO/IV amox-clav 625mg TDS/ 1.2g TDS PO cefuroxime 500mg BD IV ceftriaxone 1-2g OD + macrolides clarithromycin 500mg BD azithromycin 500mg OD DOXYCYLCINE 100mg BD OR: levofloxacin 750mg OD
59
CAP non severe inpt ADD-ONS
+/- MRSA: vanco (25-30mg/kg LD, 15mg/kg Q8-12H), linezolid 600mg BD +/- PSEUDO: MPL3,4 PO/ IV levo 750mg OD IV meropenem 1g TDS IV imipenem 500mg QDS IV pip-tazo 4.5g TDS IV ceftazidime 2g TDS IV cefepime 2g TDS influenza: Oseltamivir 75mg BD 5d
60
CAP non severe inpt MRSA cover when
Resp isolation of MRSA in last 1 yr hospitalisation/ IV Abx use in last 90d + MRSA PCR screen +ve
61
CAP non severe inpt pseudo cover when
Pseudo risk factors Resp isolation of pseudo in last 1 yr (MPL3,4)
62
CAP non severe anaerobic cover when
Radiology investigation (CXR, CT scan for lung abscess, empyema)
63
severe CAP IDSA
Major criteria (any 1) - Mechanical ventilation - Septic shock require vasoactive medications (haemodynamic instability) Minor criteria (>3) - RR >30breath/min - PaO2/ FiO2 < 250 - Multilobar infiltrate (extensive infection) - Confusion/ disorientation (Elderly tho..) - Uremia (urea>7 mmol/L) - Leukopenia (WBC <4/L), Must not be from other causes, chemo etc - Hypothermia (<36*C) - Hypotension, aggressive fluid resuscitation
64
CAP severe strep pneumo, H influ, atypicals, staph aureus, GNB (kleb, e.coli, pseudo), burkholderia, INFLUENZA
beta-lactams IV amox-clav 1.2g TDS IV pen G 1-3g Q4-6H *** + CEFTAZIDIME 2g TDS + macrolides azithromycin 500mg OD clarithromycin 500mg BD OR: IV levofloxacin 750mg OD + IV ceftazidime 2g TDS
65
CAP severe inpt add ons
+/- MRSA: vanco, linezolid psuedo covered by ceftazidime, levo influenza: Oseltamivir 75mg BD 5d Adjunct corticosteroid therapy
66
when cover burkholderia pseudomallei
Severe CAP in tropical countries – ceftazidime
67
severe CAP inpt MRSA risk factors
Resp isolation of MRSA in last 1 yr hospitalisation/ IV Abx use in last 90d
68
severe CAP pseudo risk factors
Resp isolation of pseudo in last 1yr Hosp or IV Abx use in last 90d
69
CAP abscess found when
Radiology investigation (CXR, CT scan for lung abscess, empyema)
70
CAP anerobe tx
PO/IV metronidazole 500mg QDS-BD/ PO 400mg TDS) CLINDAMYCIN (PO 300-450mg QDS) (IV 600mg TDS)
71
Adjunct corticosteroid therapy added when
Shock refractory to fluid resuscitation and vasopressor support No benefit in non-severe CAP Prednisolone (PO), dextromethorphan, hydrocortisone (IV)
72
when double pseudo cover
Antimicrobial resistance 1) Prior IV abx use within 90d 2) Acute renal replacement therapy prior to VAP onset 3) Isolation of Pseudo in last 1 year Hosp in a unit where >10% of pseudo are resistant to an agent being considered for monotherapy Prevalence of pseudo no known * But pt high risk of mortality * Need for ventilatory support due to HAP & septic shock
73
when VAP/HAP need MRSA cover
1) Prior IV Abx use in last 90d 2) Isolation of MRSA in last 1yr 3) Hosp in unit where >20% of SA is MRSA 4) Prevalence of MRSA in hosp unknown - But pt high risk for mortality - Need for ventilatory support due to HAP and septic shock
74
VAP/HAP tx
pseudo cover beta-lactamas MPL3,4 (meropenem, imipenem, piptazo, ceftazidime, cefepime) FQ (cipro, levo) AG (amikcain, gentamicin) MRSA cover linezolid vancomycin
75
Listeria monocytogenes found where?
Gram +ve, intracellular rod bact ○ found in moist environ, soil, water ○ Food borne (replicates in refrigerator temp -- cold deli meats, unpasteurized dairy pdt) * Infect young, old!
76
bacterial meningitis neonates covers what pathogen using which Abx?
strep B, listeria, e.coli ceftriaxone 2g BD ampicillin 2g Q4H
77
child 1mn-23mn
strep B, e.coli, strep pneumo, neisseria ceftriaxone 2g BD vancomycin 25-30mg/kg (KD), 15mg/kg/h (Q8-12H)
78
2-50yo:
strep pneumo, neisseria ceftriaxone 2g BD vancomycin 25-30mg/kg (KD), 15mg/kg/h (Q8-12H)
79
>50yo
strep pneumo, neisseria, listeria, e.coli ceftriaxone 2g BD vancomycin 25-30mg/kg (KD), 15mg/kg/h (Q8-12H) ampicillin 2g Q4H
80
culture-directed Neisseria meningiditis
5-7d pen G IV 4 MU, Q4H, ampicillin 2g Q4H ceftriaxone 2g BD
81
culture-directed for Strep pneumo (meningitis)
10-14d pen V IV 4 MU, Q4H ampicillin 2g Q4H ceftriaxone 2g BD VANCOMYCIN (25-30mg/kg LD, 15mg/kg Q8-12H)+ RIFAMPICIN IV 300mg BD
82
culture directed for strep B
14-21d pen V IV 4 MU, Q4H, ampicillin 2g Q4H ceftriaxone 2g BD
83
culture directed for Listeria monocytogenes
< 21d pen V IV 4 MU, Q4H, ampicillin 2g Q4H CMX 5mg/kg TDS MEROPENEM 2g TDS
84
add-on for bacterial meningitis
dexamethasone 10mg QDS (4d) H.Influenzae & strep pneumoniae meningitis 1) prevent Abx inflammation 2) Less hearing loss and other neurological sequelae 3) Decr mortality in strep pneumoniae meningitis
85
when admin dexamethasone
Administer 10-20mins before/ same time as 1st dose of Abx beyond neonatal age (>6wks)
86
Chemoprophylaxis using 3
rifampicin PO Ciprofloxacin PO ceftriaxone IM
87
rifampicin PO
adult 600mg/kg bd (4 dose) child 10mg/kg bd (4 dose) neonate 5mg/kg bd (4 dose)
88
ciprofloxacin PO (meningitis prophylaxis)
adult 500mg (1dose)
89
ciprofloxacin PO
adult 500mg (1dose)
90
ceftriaxone IM
adult: 125-250mg (1dose)
91
CDI non severe labs
WBC <15 x10*9 & SCr <133umol/L
92
CDI non-severe first ep
PO vancomycin 125mg QDS PO metronidazole 400mg TDS 10-14d
93
CDI severe first ep
PO vancomycin 125mg QDS 10-14d
94
CDI fulminant first ep
IV metronidazole 500mg TDS +/- PO vancomycin 500mg QDS +/- PR vancomycin 500mg QDS
95
CDAD recurrence risk factors
Resolution of CDI sx, subsequent reappearance of sx after tx discontinued 1) other Abx during/ after initial Tx of CDI 2) defective humoral immune response - Age - underlying disease 3) Continued use of PPI
96
recurrent use fidoxacin, vancomycin first
PO vancomycin tapered/ pulsed (6-12wks) 125mg QDS 10-14d 125mg BD 7d 125mg OD 7d 125mg every 2-3daysx 2-8wks
97
recurrent CDI use metronidazole first
PO vancomycin 125mg QDS 10-14d
98
STI: gonorrhea GONE AH
ceftriaxone 500mg IM (1 dose) --- 1g IF >150KG gentamicin 240mg IM + azithromycin 2g PO
99
add on for gonorrhea
chalmydia cover: PO doxycycline 100mg BD 7d
100
chalmydia DAL
doxy 100mgadd-on for g BD 7d azithromycin 1g PO levofloxacin 500mg OD 7d
101
syphilis 1,2, early latent <1yr
IM pen G 2.4 MU 1dose (benzathine) PO doxycycline 100mg BD 14d
102
syphilis 3*, late latent >1yr, unknown
IM pen G 2.4 MU 3dose (benzathine ) PO doxycycline BD 28d
103
neurosyphilis
IV crystalline pen G 3-4 MU (18-24 Q4H) 10-14d IM procaine pen G 2.4 MU + PO probecenid 500mg QDS 10-14d IV/IM Ceftriaxone 2g OD (10-14d) ---- Desensitise if penicillin allergy
104
herpes 1st epi
acyclovir 400mg TDS 7-10d IV 5-10mg/kg TDS 2-7d then PO for 10d valacyclovir PO 1g BD 7-10d
105
CST herpes
acyclovir 400mg BD valacyclovir 1g OD or 500mg OD (if less freq >10/yr)
106
episoidic herpes
Acyclovir 800mg PO BD 5d 800mg TDS 2d Valacyclovir 500mg BD 3d 1g OD 5d
107
STI diagnosis
Gonorrhea: 1) Gram stain of genital discharge 2) Culture -- Get AST for resistance strains 3) NAAT Chlamydia: 1) NAAT Syphilis: 1) Darkfield microscopy 2) Serological test Herpes 1) Virologica test (viral cell culture, NAAT) 2) Type specific serologic test ---- 6-8wks ltr HSV 1/ 2
108
HIV diagnosis
1) Serum Ab detection - HIV enzyme immunoassay Ab test HIV EIA tests - Western blot 2) HIV RNA detection/ quantification (viral load) - Nucleic acid amplification (PCR)
109
HIV response monitored through
1) CD4 Incr 50-150 in 1st year of therapy 2) Viral load (HIV RNA)
110
Nucleoside reverse transcriptase inhibitors (NRTIs)
Tenofovir Emtricitabine Abacavir Lamivudine Zidovudine
111
HIV NRTI DISADV
ADR related to mitochondrial toxicity (Z>T>A> L) * Rare but serious * Lactic acidosis * Hepatic steatosis (fatty infiltrate) * Lipoatrophy (Loss of fat) Require dose adjustment in renal impaired pt * Except abacavir
112
HIV NRTI ADV
* Established dual backbone of combi ART (2NRTI) * Renal elimination, less DDI concerns
113
TEZLA SE
* Tenofovir (NVD, renal. BMD) * Emtricitabine (Hyperpigmentation, ND) * Zidovudine (Myopathy, Bone marrow supp) * Lamivudine (Minimal toxicity, NVD) * Abacavir (NVD, Hypersensitivity reaction HLAB*5701)
114
INSTI
Bictegravir Dolutegravir Raltegravir Elvitegravir
115
INSTI ADVANTAGE
1) Bictegravir & Dolutegravir * Good virologic effectiveness 2) High genetic barrier to resistance * B/D > R/E 3) Well tolerated
116
INSTI DISADV
Bioavailability lowered by concurrent ad of polyvalent cations (Ca, Fe) B,D,E are CYP3A4 substrates Weight gain, ND, headache, depression, suicidality
117
INSTI BRED SE
Bictegravir (Scr) Raltegravir (CK, rhabdo) * Pyrexia (fever) Dolutegravir (Scr)
118
NNRTI
Efavirenz Rilpivirine
119
NNRTI ADVANTAGE
* Long half life (daily dosing) * Less metabolic toxicity
120
NNRTI DISADV
* Low genetic barrier to resistance * Cross resistance among approved NNRTIs * Skin rash, SJS (E>R) * Potential for CYP450 drug interactions QTc prolongation
121
RILFAV SE
* Rilpivirine (Depression, headache, SJS) * Efavirenz (hepatotox, hyperLDL, neuropsy)
122
Mixed CYP inducer/ inhibitor in RILFAV (NNRTI)
E: CYP3A4 sub ○ CYP2B6, 2C19 inducer R: CYP3A4 sub ○PO ab reduced when incr pH (no PPI)
123
PI
Ritonavir Lopinavir Atazanavir Darunavir Fosamprenavir (ritonavir/ cobicistat)
124
PI ADVANTAGE FARDL
High genetic barrier to resistance * Esp those with high viral load, risk mutation PI resistance is less common
125
PI DISADV
* Liver toxicity (if hep B,C) * DDI: CYP3A4 inhibitors, substrates * Metabolic complications (LDL, insulin) * GIT (NVD) * Lipohypertrophy, fat maldistribution * Incr risk of osteopenia/ osteoporosis
126
FARDL SE
Atazanavir (less GI, lipid effect, need LOW ab, skin rash, hyperbilirubin, QT) Ritonavir (CYP3A4, 2D6i) * Freq combined with other PI, boost lvl (Lopinavir/ ritonavir) SE: paresthesia (numb in extremities), taste perversion Darunavir (less lipid, SJS) (sulphonamide)
127
Fusion inhibitors
Enfuvirtide
128
Enfuvirtide ADVANTAGE AND DISADV
* No appreciable DDI * Inj site reaction * Rare hypersensitivity reaction (Fever, chill, decr BP) * Incr bacterial pneumonia
129
CCR5 antagonist
Maraviroc
130
Maraviroc DISADVANTAGE
CYP3A4 substrate * Abdominal pain * Cough * Dizziness * Musculoskeletal sx * Pyrexia * Rash * Upper resp tract infections * Hepatotoxicity * Orthostatic hypotension