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D(2) dopamine
receptor
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
Sodium-
dependent
dopamine
transporter
Synaptic
vesicular amine
transporter
Aromatic-L-
amino-acid
decarboxylase
Tyrosine
3-monooxygenase
Dopamine
Ca
+
Promazine
Ca
+
Dopamine
Dopamine
Promazine
L-Dopa
CO
2
L-Tyrosine
Tetrahydrobiopterin
O
2
Dihydrobiopterin
H
2
O
Na
+
Na
+
Pyridoxal
5'-phosphate
Gi signaling
cascade
Fe2+
Cytosol
Postsynaptic Neuron
Presynaptic Neuron
Cytosol
Synaptic Vesicle
Synapse
Promazine is a D2 receptor
antagonist. Promazine acts
as an antagonist to other
receptors such as 5HT2A,
5HT2C, M1, HI and Alpha 1A
receptors
↓ Positive, negative and
cognitive symptoms of
schizophrenia
Excess dopamine in the brain
triggers positive symptoms
of schizophrenia
Brain
Mesolimbic pathway
Blood Brain Barrier
Promazine is injected
intravenously and
intramuscularly. It readily
diffuses into the brain via
lipid mediated diffusion.
passive diffusion
DRD2
CACNA1A
CACNB1
CACNA2D2
SLC6A3
SLC18A2
DDC
TH
Dopamine
Calcium
Promazine
Calcium
Dopamine
Dopamine
Promazine
L-Dopa
Carbon dioxide
L-Tyrosine
Tetrahydrobiopterin
Oxygen
Dihydrobiopterin
Water
Sodium
Sodium
Gi signaling
cascade
DRD2
CACNA1A
CACNB1
CACNA2D2
SLC6A3
SLC18A2
DDC
TH
LDP
Ca
+
Promazi
Ca
+
LDP
LDP
Promazi
L-Dopa
CO
2
Tyr
BH4
O
2
BH3
H
2
O
Na
+
Na
+
Pyr-5'P
Gi si c
Fe2+
Cytosol
Postsynaptic Neuron
Presynaptic Neuron
Cytosol
Synaptic Vesicle
Synapse
Promazine is a D2 receptor
antagonist. Promazine acts
as an antagonist to other
receptors such as 5HT2A,
5HT2C, M1, HI and Alpha 1A
receptors
↓ Positive, negative and
cognitive symptoms of
schizophrenia
Excess dopamine in the brain
triggers positive symptoms
of schizophrenia
Brain
Mesolimbic pathway
Blood Brain Barrier
Promazine is injected
intravenously and
intramuscularly. It readily
diffuses into the brain via
lipid mediated diffusion.
passive diffusion