Tricyclic Antidepressants

Tricyclic Antidepressants

TRICYCLIC ANTIDEPRESSANTS TRICYCLIC ANTIDEPRESSANTS Drugs with low safety/therapeutic index (TCA poisoning can occur). MOA: Acts by inhibiting serotonin & noradrenaline reuptake. Steps: NA & serotonin initially act on pre-synaptic α2 & 5HT receptors. By inhibiting them, transmitter concentration is increased in synaptic cleft.   Decreased firing of locus ceruleus (NA) & nucleus raphe Magnus (5HT).   

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