There is a molecule known as the SERT (serotonin transporter) which acts like a bus that picks up the serotonin and takes it back to its “home base” neuron for processing. By blocking the action of SERT, more serotonin can build up in the synapse and hopefully, lead to improved mood or reduced anxiety. This is how the popular SSRIs (selective serotonin re-uptake inhibitors such as Prozac and Zoloft) work.
