Autonomic Sympathetic Drugs: Indirect Sympathomimetics Flashcards
catecholamines
epinephrine, norepinephrine, dopamine
adrenergic nerve terminal is the site of action of
indirect sympathomimetics
Site of action of indirect sympathomimetics
adrenergic nerve terminal
tyrosine is transported to
the vesicle containing neurotransmitters in the presynaptic nerve terminal
Which amino acid is a precursor to catecholamines
tyrosine
Tyrosine is converted to
L-DOPA
L-DOPA is converted to
dopamine
metyrosine prevents
conversion of tyrosine to L-DOPA
metyrosine is a
tyrosine analog
dopamine is converted to norepinephrine in the
vesicle containing neurotransmitters in the presynaptic neuron
norepinephrine transporter (NET)
norepinephrine transporter (NET) transports norepinephrine (and dopamine) back into the presynaptic neuron
dopamine transporter (DAT)
dopamine transporter (DAT) transports dopamine back to the presynaptic neuron
cocaine inhibits
cocaine inhibits
cocaine can cause
- agitation
- pupillary dilation
- hypertension
- tachycardia
- nasal mucosal atrophy or septal perforation
- coronary vasospasm and myocardial ischemia
cocaine can cause nasal mucosal atrophy or septal perforation due to
vasoconstriction
cocaine induced coronary vasospasm can cause
angina
in cocaine intoxication beta-blockers can cause
beta-blockers can cause severe hypertension in cocaine intoxication (unopposed alpha-1 stimulation)
NET inhibitor
atomoxetine
atomoxetine treats
attention deficit and hyperactivity disorder (ADHD)
________ are transported by vesicular monoamine transporter (VMAT)
catecholamines
catecholamines are transported by VMAT into
presynaptic vesicle
Reserpine
reserpine inhibits VMAT, depleting neurotransmitter stores
Amphetamines
displace catecholamines (norepinephrine, dopamine) into synapse
amphetamines can be used to treat
ADHD
methylphenidate is an
is an amphetamine derivative
methylphenidate treats
ADHD
Treats ADHD
- methylphenidate
2 amphetamine - atomoxetine
Modafinil is a
stimulant used to treat narcolepsy
Stimulants include
- amphetamines
- methylphenidate
- modafinil
Stimulants suppress
appetite
D1 is coupled to
Gs
D2 is coupled to
Gi
low doses of dopamine act on D1 receptors to
increases renal blood flow
medium doses of dopamine activate
beta-1 receptors (cardiac activation)
high doses of dopamine activate
alpha-1 receptors (pressor effects)
D2 receptors are found in the
CNS