Antiseizure Flashcards
2 antisz drugs used for chronic pain
gabapentin
pregabalin
3 mood stabilizing drugs used for antisz
valproic acid
divalproex
lamotrigine
carbamazepine
3 drugs used for partial sz
carbamazepine
levetiracetam
lamotrigine
3 drugs used for tonic clonic sz
valproate
levetiracetam
lamotrigine
3 drugs used for atonic myoclonic sz
vaproate
levetiracetam
lamotrigine
2 drugs used for absence sz
ethosuximide
valproate
2 drugs used for status epilepticus
lorazepam
midazolam
add-ons for sz
valproate
phenytoin
gabapentin
phenobarbital
clonazepam
levetiracetam
2 antisz drugs that work on peripheral Na channels
carbamazepine
oxacarbazepine
2 anti sz drugs that work on central Ca channels
gabapentin
pregabalin
4 meds that work on NE/serotonin/opioid receptors (descending inhibition)
TCADs
SNRIs
tramadol
opioids
pharmacotherapy of bipolar disorder
stabilize mood: lithium AND valroate
mania: atypical antipsychotics
acute mania: bdz’s vs atypical antipsychotics
dpn: lamotrigine vs antidpn
management of menstrual migraines
NSAIDs
management of HTN
bb
ccbs
management of comorbid dpn
TCADs
management of comorbid sz d.o or bipolar
anticonvulsants
alternative for migraines if pharm is ineffective
botox
2 FDA approved prophylactic antisz meds for migraines
valproate
topiramate
gabapentin also effective
seizures are grouped in to (2)
generalized → bilateral convulsive sz
focal
4 types of generalized sz
tonic-clonic
absemce
atonic
myoclonic
excessive neuronal discharge characterized as brief, involuntary, episodic
seizure
violent involuntary contraction of voluntary muscles
convulsion
chronic sz disorder
epilepsy
effective drugs for generalized (tonic-clonic sz) are identified via __ test
MES
generalized/tonic-clonic sz’s are characterized by
LOC
two phases of generalized sz
tonic
clonic
rigid extension of tunk/limbs
tonic phase
rhythmic contractions of arms/legs
clonic phase
initiation of generalized sz’s occur due to loss of __
GABA inhibitory zone
propagation of generalized sz’s occur due to
decreased GABA tone over large area
PLUS
increased response to glutamate and Na channel excitation
generalized absence sz (petit mal) are characterized by
impaired consciousness w. staring spell
normal fxn after sz
generalized absence sz are caused by
activation of T-type Ca channels
effective drugs for generalized absence (petit) mal sz are identified w. __ test
PTZ
3 types of partial sz
simple
complex
secondary
partial sz are characterized by
preservation of consciousness
partial sz originate in
cortical restricted region
simple partial sz are characterized by __
complex partial sz are characterized by
preservation of consciousness
loss or impaired consciousness
what type of partial sz is difficult to tx due to initiation rather than propagation
secondary generalized
partial sz’s begin
focally
sz pathophys pathway
increased O2 demand → ischemia → brain damage → more sz
3 steps in sz
focal epileptogenesis → synchronization → propagation
channel/receptor involved in epileptogenesis
VSSC/VSCC
GABA and GLU
what leads to propagation of sz (4)
alterations in extracellular ions → Mg, Ca, H+
hypoxia
drug withdrawal
toxins
2 goals of antisz drugs
elevating threshold
limiting proagation
drugs are more effective in __
than __
sz propagation (generalized)
initiation (partial)
4 drugs that inhibit Na channel fxn
phenytoin
carbamazepine
lamotrigine
topiramate
block repetitive firing
Na blockage is __ dependent
dose
3 drugs that enhance inhibitory effect of GABA → increase opening of Cl channels
benzos
phenobarbital
valproate
drug that decreases low-threshold (T-type) Ca channels
ethosuximide
what is ethosuximide used for
absence sz
drug that inhibits high voltage activated Ca channels (N-type) → decrease glutamate/NT release
lamotrigine
drug that impairs Ca mediated NT release → inhibits synaptic release
levetiracetam → SV2A
gabapentin/pregabalin → a2 ligand
carbamazepine is often used first for partial sz and tonic-clonic sz
carbamezepine → tegretol
carbamazepine is a strong inducer of __
and has many __
CYP450
ddi
rare but serious s.e of carbamazepine
aplastic anemia → agranulocytosis
hepatotoxicity
2 monitoring tests for carbamazepine
CBC
liver fxn
phenytoin is very effective against (2)
partial
tonic-clonic
phenytoin → dilantin is a strong inducer of __
and has lots of __
CYP450
ddi
dose related adverse rxn’s of phenytoin
nystagmus
diplopia
ataxia
sedation
chronic adverse rxn’s of phenytoin
rash
ginigival hyperplasia
hirsutism
osteomalacia/OP
what broad spectrum drug works on VSSC and decreases Glu release
lamotrigine (lamictal)
lamotrigine is first line for (2)
and is better tolerated than (2)
partial sz
generalized sz
phenytoin
carbamazepine
adr’s of lamotrigine are similar to acute adr’s of__ but lower incidence
phenytoin →
diplopia
ataxia
dizziness
skin rashes
sedation
levetiracetam (keppra) is first line for
generalized tonic-clonic
adr’s of levetiracetam
somnolence, asthenia,
dizziness
overall low ADRs
t/f: levetiracetam does not have cognitive effects and does not effect CYP
T
what limits s.e of gabapentin/pregabalin
saturable oral absorption
generally free from adr
4 newer AEDs (anti epileptic drugs)
topiramate → topamax
zonisamide → zonegran
lacosamide → vimpat
which newer AED drug is a schedule V controlled substance
lacosamide → vimpat
dt euphoria/inebriation like response
lacosamide is well tolerated, but s.e include
dizzy
HA
nausea
diplopia
drug of choice in absence sz
ethosuximide → zarontin
mc s.e of ethosuximide
dose related GI
broad spectrum drug w. efficacy against mc seizure types
valproate → depakote
ddi of velproate
other AEDs
2 common s.e of valproate
dose related GI
wt gain
black box warnings for valproate (2)
hepatic failure
teratogenic
4 benzos used for antisz
clonzepam → klonopin
lorazepam → ativan
midazolam → versed
diazepam → valium
clonazepam is effective for
absence sz
PLUS
difficult cases → myoclonic, infantile, atonic
drug of choice for status epilepticus
benzos
phenobarbital is used for
neonatal status epilepticus
adjunct for partial and tonic-clonic
does phenobarbital affect P450
yes!
classic inducer
adverse ddi of phenobarbital
overactivity vs sedation in kids
recurrent major sz between which pt does NOT regain consciousness
status epilepticus
mortality of 20-25%
tx of status epilepticus
initial: IV lorazepam
then slow infusion: phenytoin or fosphenytoin
if persist: IV phenobarbital
refractory: phenobarbital or propofol
t/f: risk to offspring from AED is less than risk from maternal sz
T!
highest AED risk in pregnancy (2)
valproate
phenobarbital
__therapy is preferred for AED use in pregnancy
mono
what should be give to MOC on AED in final month of pregnancy
vit K
what 2 AEDs can decrease efficacy of OCP
phenytoin
carbamazepine
enzyme inducing AEDs