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Since no action potential
arrives to the nerve
terminal, calcium entry does
not occur and
neurotransmitters like
glutamate are not released
from synaptic vesicles into
the synapse.
Phenytoin blocks the
channel, preventing the
entry of sodium into the
neuron.
Glutamate
receptor 1
Glutamate
receptor 2
Glutamate
[NMDA] receptor
subunit
epsilon-1
Glutamate
[NMDA] receptor
subunit zeta-1
Glutamate
[NMDA] receptor
subunit
epsilon-3
Glutamate
[NMDA] receptor
subunit
epsilon-2
Glutamate
[NMDA] receptor
subunit
epsilon-4
Glutamate
[NMDA] receptor
subunit 3A
Glutamate
[NMDA] receptor
subunit 3B
Sodium channel
protein type 5
subunit alpha
Potassium
voltage-gated
channel
subfamily D
member 2
Kv channel-
interacting
protein 2
Voltage-
dependent
P/Q-type
calcium channel
subunit
alpha-1A
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-2
Voltage-
dependent
T-type calcium
channel subunit
alpha-1H
Voltage-
dependent
T-type calcium
channel subunit
alpha-1G
Multidrug
resistance-
associated
protein 4
Solute carrier
family 22
member 11
Alkaline
phosphatase,
tissue-
nonspecific
isozyme
Cytochrome P450
2C9
Glutamate
Phenytoin
K
+
K
+
Ca
+
Ca
+
Glutamate
Na
+
Na
+
Ca
+
Ca
+
Ca
+
Ca
+
Na
+
Na
+
Phenytoin
Fosphenytoin
3-(Hydroxymethyl)phenytoin
Phenytoin
Heme
Depolarization
axon width = 9
Presynaptic Neuron
Post-synaptic Neuron
Membrane Potential (mV)
0
40
-70
Hyperpolarization
Repolarization
Peak action potential
Resting potential
The depolarization phase of
the action potential is
inhibited, therefore, the
action potential cannot be
geenrated.
ACTION POTENTIAL
Time (ms)
Endoplasmic Reticulum
Hepatocyte
The post-synaptic neuron is
unable to depolarize due to
the inhibition of
neurotransmitter release.
Synaptic Vesicle
Fosphenytoin is administered
via intravenous or
intramuscular injection
Mitochondria
Endoplasmic Reticulum
GRIA1
GRIA2
GRIN2A
GRIN1
GRIN2C
GRIN2B
GRIN2D
GRIN3A
GRIN3B
SCN5A
KCND2
KCNIP2
CACNA1A
CACNB1
CACNA2D2
CACNA1H
CACNA1G
ABCC4
SLC22A11
ALPL
CYP2C9
Glutamate
Phenytoin
Potassium
Potassium
Calcium
Calcium
Glutamate
Sodium
Sodium
Calcium
Calcium
Calcium
Calcium
Sodium
Sodium
Phenytoin
Fosphenytoin
3-
(Hydroxymethyl)phenytoin
Phenytoin