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ADRA1A
ADRB1
ADRB2
SLC6A2
SLC18A2
SLC6A2
SLC18A2
DDC
DBH
MAOA
TH
ALDH3A1
COMT
Norepinephrine
Phentermine
Norepinephrine
Norepinephrine
Norepinephrine
Phentermine
Phentermine
L-Dopa
Dopamine
Carbon dioxide
Ascorbic acid
Oxygen
Dehydroascorbic
acid
Water
Water
Oxygen
3,4-
Dihydroxymandelaldehyde
Hydrogen
peroxide
Ammonia
L-Tyrosine
Tetrahydrobiopterin
Oxygen
Dihydrobiopterin
Water
NAD
Water
3,4-
Dihydroxymandelic
acid
NADH
Hydrogen Ion
S-
Adenosylmethionine
Vanillylmandelic
acid
S-
Adenosylhomocysteine
Gq signaling
cascade
Gs signaling
cascade
ADRA1A
ADRB1
ADRB2
SLC6A2
SLC18A2
SLC6A2
SLC18A2
DDC
DBH
MAOA
TH
ALDH3A1
COMT
Norpp
Fenterm
Norpp
Norpp
Norpp
Fenterm
Fenterm
L-Dopa
LDP
CO
2
VitC
O
2
DHAA
H
2
O
H
2
O
O
2
34DIHY
H
2
O
2
NH
3
Tyr
BH4
O
2
BH3
H
2
O
NAD
H
2
O
34-DHMA
NADH
H
+
SAMe
VMA
SAH
Mg2+
Gq si c
G s c
FAD
Pyr-5'P
Fe2+
Pqq
Cu
Post synaptic neuron
Norepinephrine is
synthesized from tyrosine
and stored in presynaptic
vesicles.
Synapse
Cytosol
Presynaptic Neuron
Cytosol
Postsynaptic Neuron
Diffusion
Blood-Brain Barrier
Suppression of Appetite
Phentermine is a
sodium-dependent
noradrenaline transporter
inhibitor. This activity
results in higher
concentrations of
noradrenaline in the
synapse.
Norepinephrine activates the
postsynaptic adrenergic
receptors (alpha and beta).
This provokes the satiety
feeling.
Lateral Hypothalamus