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Gamma-
aminobutyric
acid receptor
subunit beta-2
Gamma-
aminobutyric
acid receptor
subunit gamma-2
Gamma-
aminobutyric
acid type B
receptor
Gamma-
aminobutyric
acid receptor
subunit alpha-1
Adenylate
cyclase type 1
Vesicular
inhibitory
amino acid
transporter
Voltage-
dependent
P/Q-type
calcium channel
subunit
alpha-1A
Glutamate
decarboxylase 1
γ-Aminobutyric acid
cAMP
γ-Aminobutyric acid
Ca
+
Lorazepam
L-Glutamic acid
Cl
-
γ-Aminobutyric acid
Ca
+
Lorazepam
Lorazepam
Cl
-
CO
2
ATP
PP
i
Magnesium
Pyridoxal
5'-phosphate
Gi/o signalling
Glutamate
Metabolism
Hyperpolarization
Hyperpolarization leading to
reduced depolarization and
excitability. Decreasing
neuronal excitability has a
sedative effect
Presynaptic Neuron
Post Synaptic Neuron
Synaptic Vesicle
GABA binds to the GABA A
receptor in between the
alpha and beta subunits.
This causes the chloride
channel to open causing
hyper-polarization in the
post synaptic neuron
suppressing signalling.
Lorazepam binds to an
allosteric site of the GABA
A receptor between the gamma
and alpha subunits. This
also causes the chloride
channel to open more
frequently causing
hyper-polarization in the
post synaptic neuron further
suppressing signalling.
Cytosol
Cytosol
Synapse
Lorazepam is administered as
an oral tablet
GABRB2
GABRG2
GABBR2
GABRA1
ADCY1
SLC32A1
CACNA1A
GAD1
γ-Aminobutyric
acid
cAMP
γ-Aminobutyric
acid
Calcium
Lorazepam
L-Glutamic acid
Chloride ion
γ-Aminobutyric
acid
Calcium
Lorazepam
Lorazepam
Chloride ion
Carbon dioxide
Adenosine
triphosphate
Pyrophosphate
Gi/o signalling
Glutamate
Metabolism
Hyperpolarization
GABRB2
GABRG2
GABBR2
GABRA1
ADCY1
SLC32A1
CACNA1A
GAD1
GABA
cAMP
GABA
Ca
+
Ativan
Glu
Cl
-
GABA
Ca
+
Ativan
Ativan
Cl
-
CO
2
ATP
PP
i
Mg2+
Pyr-5'P
Gi/ sig
PW000003
Hyper
Hyperpolarization leading to
reduced depolarization and
excitability. Decreasing
neuronal excitability has a
sedative effect
Presynaptic Neuron
Post Synaptic Neuron
Synaptic Vesicle
GABA binds to the GABA A
receptor in between the
alpha and beta subunits.
This causes the chloride
channel to open causing
hyper-polarization in the
post synaptic neuron
suppressing signalling.
Lorazepam binds to an
allosteric site of the GABA
A receptor between the gamma
and alpha subunits. This
also causes the chloride
channel to open more
frequently causing
hyper-polarization in the
post synaptic neuron further
suppressing signalling.
Cytosol
Cytosol
Synapse
Lorazepam is administered as
an oral tablet