Antidepressants Flashcards
3 neurotransmitters implicated in depression
Serotonin
Dopamine
Noradrenaline/ Norepinephrine
S&S of Depression
Persistent low mood
loss of pleasure in usual activities
fatigue
changes in sleep habits
difficulty in concentration
Aetiology (cause) of depression
stressful events
physical illness
genetics
social isolation
trauma
what antidepressants do
bring neurotransmitters (serotonin, dopamine and noradrenaline) normal level in the body
how long antidepressants benefits can be observed and what are noticeable changes
up to 8 weeks
improvement in sleep, appetite and motivation
neurotransmitter found in the brain made by amino acid trytophan. Contributes to feeling of wellbeing and happiness
This is also 90% found in the GI tract, increases gastric and colonic motility, nausea, vasoconstriction and platelet aggregation
Serotonin
5- hydroxytryptamine (5-HT) is a monoamine neurotransmitter also called as
Serotonin
Monoamine oxidase (MAO) enzyme catalyses or breakdown which neurotransmitters?
Serotonin (5-HT)
Dopamine
Noradrenaline
4 classes of Antidepressant drugs
SSRI/ Selective Serotonin Reuptake Inhibitors
SNRI/ Serotonin and Noradrenaline Reuptake Inhibitors
Tricyclic Antidepressants (TCA)
Monoamine oxidase inhibitor (MAOI)
Pharmacodynamics of SSRI and SNRI
Inhibit reuptake pumps for serotonin and noradrenaline
Temporary or transitory adverse effects of SSRIs and SNRIs
Dizziness, confusion, disorientation, increased anxiety
Nausea
Sleepiness
Suicidal thoughts (young people)
Long term adverse effects of SSRIs and SNRIs
Tremor
Sexual dysfunction
Sweating
Hyponatraemia
Weight loss or gain
HTN and Tachy (SNRI)
Pharmacodynamics of TCA (Tricyclic Antidepressants)
Serotonin and noradrenaline reuptake inhibitors
Histamine (inflammatory mediator for allergic reactions) and acetycholine (parasympathetic neurotransmitter) antigonist
Na and Ca channels inhibitors
First line drug of depression and anxiety
SSRI (Selective Serotonin reuptake inhibitors)
Major side effect of SSRI overdose
Serotonin Syndrome