Pharmacology - Anxiolytics Flashcards
what neural circuit controls the fear symptoms in anxiety?
amygdala centered circuit
what neural circuit controls the worry symptoms of anxiety?
cortico striatal thalamic cortical circuit
where in the brain is the affect of fear controlled?
anterior cingulate cortex/orbitofrontal cortex
what part of the brain controls avoidance?
periaqueductal grey
what part of the brain causes an increase in cortisol?
hypothalamus
what part of the brain causes increased BP and HR?
locus coeruleus
what five neurotransmitters are involved in amygdala centred circuits?
serotonin GABA glutamate CRF noradrenaline
what is the main inhibitory transmitter in the brain?
GABA
which drugs enhance the action of GABA?
benzodiazepines
what are the three main GABA receptors?
A B and C
which GABA receptor is the target of benzodiazepines?
GABA-A
also the target of barbiturates and alcohol
name three examples of benzodiazepines
lorazepam
diazepam
chlordiazepoxide
what pharmacological effects do benzodiazepines have?
reduce anxiety
sedation
muscle relaxation
anticonvulsant effect
how do benzodiazepines act?
increase GABA mediated inhibition
what is the antagonist used to treat benzodiazepine overdose?
flumazenil
name three possible issues with benzodiazepine use
paradoxical aggression
anterograde amnesia
tolerance
what is the first step in withdrawing a patient from benzodiazepines?
reduce the dose every few weeks in steps of 2mg
if symptoms occur maintain the dose until symptoms improve
what antidepressants can be used acutely for anxiety?
SSRIs
increase extracellular serotonin