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WorksheetsAntiepileptic Drugs Quiz
Total questions: 20
Worksheet time: 10mins
Antiepileptic drugs act mainly by
Enhancing excitatory transmission
Reducing neuronal excitability
Increasing glutamate release
Blocking GABA synthesis
Phenytoin primarily acts by
Blocking T-type Ca channels
Blocking voltage-gated Na+ channels
Enhancing GABA action
Inhibiting NMDA receptors
Sodium valproate has which major mechanism?
Only Na+ channel blockade
Only GABA inhibition
Na+ channel blockade and ↑ GABA levels
T-type Ca channel blockade only
Drug of choice for absence seizures is
Phenytoin
Carbamazepine
Ethosuximide
Sodium valproate
Ethosuximide acts mainly by blocking
T-type Ca channels
Na+ channels
GABA-A receptors
NMDA receptors
Broad-spectrum antiepileptic drug is
Phenytoin
Carbamazepine
Phenobarbitone
Sodium valproate
Phenytoin follows which kinetics at therapeutic range?
Zero-order only
First-order only
Mixed first to zero order
Nonlinear only
Common adverse effect of phenytoin is
Gingival hyperplasia
Parkinsonism
Hepatotoxicity only
Nephrotoxicity
Teratogenic effect classically associated with phenytoin is
Neural tube defect
Fetal hydantoin syndrome
Phocomelia
Cleft palate
Sodium valproate is contraindicated in
Epilepsy
Bipolar disorder
Pregnancy
Absence seizures
Major adverse effect of sodium valproate includes
Hypoglycemia
Weight gain and hepatotoxicity
Gingival hyperplasia
Osteoporosis
Phenobarbitone primarily enhances
Na+ channel inactivation
GABA-mediated Cl− influx
Ca2+ channel blockade
Glutamate release
Phenobarbitone differs from benzodiazepines by
Increasing frequency of Cl− channel opening
Increasing duration of Cl− channel opening
Acting only on GABA-B receptors
Having no sedative action
Therapeutic use of phenobarbitone includes
Absence seizures
Generalized tonic–clonic seizures
Myoclonic seizures only
Panic disorder
Adverse effect of phenobarbitone includes
Insomnia
Hyperactivity in children
Respiratory depression at high dose
Hepatotoxicity only
Phenobarbitone induces hepatic enzymes leading to
Increased drug levels
Reduced metabolism of drugs
Drug interactions
Reduced clearance
Phenytoin is ineffective in
Generalized tonic–clonic seizures
Partial seizures
Status epilepticus (IV)
Absence seizures
Drug of choice for status epilepticus (acute control) is
Phenytoin oral
Diazepam IV
Carbamazepine
Ethosuximide
Valproate is useful in which seizure type?
Absence only
Myoclonic seizures
Partial seizures only
Febrile seizures only
Mechanism contributing to valproate efficacy in absence seizures is
Na+ channel blockade only
Enhanced GABA only
T-type Ca channel blockade
None
