Det virker ved at forhindre neurotransmitterne 5- hydroxytrypamin (også kaldet serotonin) og noradrenalin i at blive genoptaget i nerveceller i hjernen og rygmarven.
It works by preventing the neurotransmitters 5-hydroxytrypamine (also called serotonin) and noradrenaline from being taken back up into nerve cells in the brain and spinal cord.