Epilepsy Drugs Flashcards
Benzodiazepines - MOA
Increase GABAA action
Carbamazepine - MOA
Ethosuximide - MOA
Blocks thalamic T-type Ca2+ channels
Gabapentin - MOA
Primirily inhibits high-voltage-activated Ca2+ channels; designed as GABA analog
Lamotrigine - MOA
Blocks voltage-gated Na+ channels
Inhibits release of glutamate
Levetiracetam - MOA
unknown
may modulate GABA and glutamate release
Phenobarbital - MOA
increase GABAA action
Phenytoin - MOA
Blocks Na+ channels
zero order kinetics
Tiagabine - MOA
increase GABA by inhibiting reuptake
Topiramate - MOA
blocks Na+ channels
Increase GABA action
Valproic Acid - MOA
increase Na+ channel inactivation
increase GABA concentration by inhibiting GABA transaminase
Vigabatrin - MOA
Increase GABA
irreverisble GABA transaminase inhibitor
Benzodiazepines - indications
status epilepticus
also for eclampsia seizures (first line MgSO4)
Benzodiazepines - side effects
sedation, tolerance, dependence. respiratory depression
carbamazepine - side effects
diplopia. ataxia, blood dyscrasias (agranulocytosis, aplastic anemia), liver toxicity, SIADH, Stevens-Johnson syndrome
teratogenesis (cleft lip/palate, spina bifida)
induction of cytochrome P450
carbamazepine - indications
partial (focal) seizures
tonic-clonic seizures
first line trigeminal neuralgia
ethosuximide - indications
absence seizures
ethosuximide - side effects
EFGHIJ
Ethosuximide causes:
Fatigue
GI distress
Headache
Itching (and urticaria)
and stevens-Johnson syndrome
gabapentin - indications
partial (focal) seizures
peripheral neuropathy, postherpetic neuralgia
gabapentin - side effects
sedation, ataxia
lamotrigine - indications
partial (focal) seizures
tonic-clonic seizures
absence seizures
lamotrigine - side effects
stevens-johnson syndrome and toxic epidermal necrolysis
levetiracetam - indications
partial (focal) seizures
tonic-clonic seizures
leveitracetam - side effects
neuropsychiatric symptoms (personality change), drowsiness, fatigue, headache, gait instability
phenobarbital - indications
partial (focal) seizures
tonic-clonic seizures
status epilepticus
*first line in neonates
phenobarbital - side effects
sedation, tolerance, dependence, cardiorespiratory depression
induction of CYP450
phenytoin - indications
partial (focal) seizures
tonic-clonic seizures
status epilepticus
phenytoin - side effects
PHENYTOIN
P450 induction
Hirsutism
Enlarged gums
Nystagmus
Yellow-brown skin
Teratogen (fetal hydantoin syndrome)
Osteopenia
Inhibited folate absorption
Neuropathy
Rare adverse events: SJS, DRESS syndrome, SLE-like syndrome
Toxicity -> diplopia, ataxia, sedation
tiagabine - indications
partial (focal) seizures
topiramate - indications
partial (focal) seizures
tonic-clonic seizures
migraine prevention
Topiramate - side effects
sedation, mental dulling, word-finding difficulty, kidney stones, weight loss, glaucoma
valproic acid - indications
partial (focal) seizures
tonic-clonic seizures
absence seizures
myoclonic seizures, bipolar disorder, migraine prophylaxis
valproic acid - side effects
GI distress, rare but fatal hepatotoxicity (measure LFTs), pancreatitis, neural tube defects, trumor, weight gain, SJS, SIADH
contraindicated in pregnancy
vigabatrin - indications
partial (focal) seizures
vigabatrin - side effects
permanent visual loss