Seizures Flashcards
Carbamazepine brand name
Tegretol
Carbamazepine MOA
limits influx of Na+ ions across cell membrane, stimulates release of ADH
Carbamazepine dosing
2 divided doses
initial 400 mg/day
max 1600 mg/day
Precautions of carbamazepine
caution in hepatic
renal adjust to 75% of dose when CrCl < 10
Carbamazepine levels
4-12 mcg/mL
toxic > 15
Black box warning for carbamazepine
dermatologic reactions
aplastic anemia/ agranulocytosis
carbamazepine preg cat
D
Clobazam brand name
Onfi
Clobazam MOA
BZD binds to postsynaptic GABA neuron; enhances GABA -> hyperpolarization
Clobazam dosing
5 mg BID x 1 week -> 10 BID x 1 week -> 20 mg BID
Clobazam drug interactions to avoid
CNS depressants strong CYP 2C19 inhibitors CYP3A4 inducers estrogen contraceptives other BZDs
Precautions with clobazam
CrCl<30
caution in severe hepatic impairment
schedule of clobazam
IV
safety alert for clobazam
SJS
TEN
Clobazam in pregnancy
1st trimester avoid
Clonazepam MOA
enhances GABA, suppresses spike and wave discharge by depressing nerve transmission
Clonazepam dosing
2-8 mg QD in 1-2 divided doses
max 20 mg daily
Clonazepam preg cat
D
Eslicarbazepine brand name
Aptiom
Eslicarbazepine MOA
inhibit voltage gated sodium channels
Eslicarbazepine brand name
400 mg daily x 1 week -> 800 mg daily
max 1200 mg daily
Avoid eslicarbazepine with what
strong 3A4 inducers
Eslicarbazepine induces what
2C19
Precautions with eslicarbazepine
renally dose
avoid in severe hepatic impairment
dose dependent AEs with eslicarbazepine
CNS related - dizziness, drowsiness, HA
Eslicarbazepine preg cat
C
Ethosuximide brand name
Zarontin
ethosuximide MOA
diminish T-type calcium currents in thalamic neurons
Ethosuximide dose
500 mg/day increase 250 mg x 4-7 days up to 1500 mg/day in divided doses
Therapeutic level of ethosuximide
40-100 mcg/mL
AEs of ethosuximide
N/V
sleep disturbances
drowsiness
hyperactivity
Ezogabine brand name
Potiga
Ezogabine MOA
voltage gated potassium channels -> stabilization -> regulated excitability
Ezogabine dosing
100 mg TID increase weekly by 150 mg to 200-400 mg TID
max 1200 mg/day
precautions with ezogabine
renally dose
hepatic dose for moderate-severe
QT prolongation
ezogabine drug interactions to avoid
QTC prolonging
ezogabine black box warning
retinal abnormalities
potential vision loss
Felbamate brand name
Felbatol
Felbamate MOA
inhibitory effects GABA receptor binding and BZD receptor binding
Felbamate dosing as monotherapy
1200 mg/day in divided doses 3-4 x/day increase by 600 mg x 2 weeks to 2400 mg/day
max 3600 mg/day
felbamate dosing as adjunct
incremental increase is by 1200 mg
avoid felbamate with what
drugs metabolized by CYP3A4
Precautions with felbamate
transaminase and hematologic renally dose (50%) Avoid in hepatic impairment
Felbamate black box warning
aplastic anemia
hepatic failure
Felbamate preg cat
C
Fosphenytoin brand name
Cerebryx
Fosphenytoin MOA
increased efflux or decreased influx of sodium ions
Fosphenytoin interactions by strongly inducing
CYP2B6 CYP2C19 CYP2C8 CYP3A4 p-glycoprotein
fosphenytoin black box warning
CV risk with rapid infusion (>150 PE/min)
fosphenytoin preg cat
D
fosphenytoin therapeutic level
10-20 mcg/mL
toxic >30
lethal > 100
fosphenytoin precautions
dermatologic reactions local toxicity (purple glove)
Gabapentin brand name
neurontin
gabapentin MOA
voltage gated calcium channels
gabapentin dosing
300 mg TID up to 1800 mg/day
avoid gabapentin with what
CNS depressants
gabapentin precautions
renally dose
gabapentin preg cat
C
AEs of gabapentin
dizziness
drowsiness
fatigue
Lacosamide brand name
Vimpat
Lacosamide MOA
slow inactivation of sodium channels
lacosamide dosing monotherapy
100 mg BID increase weekly by 50 mg BID
lacosamide dosing adjunct
50 mg BID
lacosamide precautions
prolong PR interval
lacosamide interactions
CYP3A4 inhibitors may decrease elimination
lacosamide preg cat
C
Lacosamide AEs
dizziness
ataxia
fatigue
HA
Lamotrigine brand name
Lamictal
Lamotrigine MOA
inhibits release of glutamate, inhibits voltage sensitive sodium channels
Lamotrigine precautions
renal dosing, hepatic dosing for moderate/severe +/- ascites
Lamotrigine black box warning
dermatologic rashes - SJS
Lamotrigine Preg Cat
C
Lamotrigine AE
nausea
Levetiracetam brand name
Keppra
Levetiracetam MOA
voltage dependent N type calcium channels an facilitate GABA inhibition and reduce potassium current
Levetiracetam dosing
500 mg BID + 500 mg x 2 weeks to 1500 mg BID
Levetiracetam preg cat
C
Oxcarbazepine brand name
Trileptal
Oxcarbazepine MOA
blocks voltage sensitive sodium channels and increase potassium conduction
modulate high voltage calcium channels
oxcarbazepine dosing
600 mg daily in 2 divided doses + 600 mg/day x week to 1200 mg/day
max 2400 mg/day
oxcarbazepine strongly induces
CYP3A4
AEs of oxcarbazepine
hyponatemia
CNS effects
blood dyscrasias
oxcarbazepine preg cat
C
oxcarbazepine precautions
renally dose
Perampanel brand name
Fycompa