Anti-Epileptics Flashcards
Anti-Epileptics
antieplipetic Cyp450 Inducer (5)
phenobarbital
ethosuximide
phenytoin
carbamazepine
tobacco
antieplipetic Cyp450 inhibitor (5)
erythromycin
Ca channel blockers
trimethoprim/sulfa
fluconazole
valproate
valproate
lorazepam
lamotrigine
levetiracteam relationship inducers/inhibitrs
does neither b/c not really metabolized
older people have more or less albumin
less
is renal excretion in older people increased or decreased
decreased
neonates have higher or lower protein binding than adults
lower
neonates have higher or lower metabolic rate when it comes to drugs when compared to adults
higher
do kids need higher or lower dose of durgs
higher b/c higher metabolism
pregnancy needs higher or lower does of anti-epileptics
higher
5 classes of drugs that interact w/ Anti epileptics
birth control
coumadin
anti-depressants
cholesterol-lowering
chemo
Phenobarbital use
all seizures except absence
Phenobarbital route
PO, IV
Phenobarbital half life
100 hours
Phenobarbital is metabolized where
liver
Is Phenobarbital inducer of liver enzymes?
yes
Phenobarbital toxicity (3)
hyperactivity in kids, sedation in adults, joint issues
Phenobarbital mechanism
GABA agonist
opens Cl channels
hyperpolarization
Phenytoin Use and best use
all seizures except absence. best used for focal and secondarily generalized seizures
Phenytoin mechanism
blocks voltage gated Na channels
where is phenytoin metabolized?
liver
what happens to metabolism when phenytoin is metabolized at high doses?
0 order kinetics
phenytoin half life
variable 6-24 hrs
phenytoin toxicity (3)
gingival hyperplasia, osteomalacia, ataxia
phenytoin relationship w/ weight
neutral
Benzo Use (4)
very effective for all seizure types–withdrawal, sedatives, anxiolytics
benzo drug of choice for…
Status epilepticus, alcohol withdrawal, withdrawal seizures
benzo mechanism
agonist at GABA receptor
benzo route
PO, IV
benzo toxicity (3)
sedation, depression, withdrawal
benzo caveat
addiction, tachyphylaxis
benzo metabolized where? is it an enzyme inducer
liver
no
funny story for carbamazepine
funny story: carbamazepine: carbs, need chewing= trigeminal neuralgia. carbs are food, need salt= Na channel blockade. Carbs are food= weight gain
carbamazepine mechanism
Na channel blockade
carbamazepine route
oral
carbamazepine half life
12 hours
where is carbamazepine metabolized/
liver