Antidepressants · Pharmacology

Which of the following describes the primary mechanism of action of Selective Serotonin Reuptake Inhibitors (SSRIs)?

  1. Antagonizing 5-HT2A receptors in the post-synaptic neuron
  2. Inhibiting the SERT protein to raise synaptic serotonin
  3. Increasing the rate of serotonin synthesis from tryptophan
  4. Inhibiting Monoamine Oxidase Type A (MAO-A)
Show answer and explanation

Correct answer: Inhibiting the SERT protein to raise synaptic serotonin

SSRIs specifically bind to and inhibit the serotonin transporter (SERT). This prevents the reuptake of serotonin into the presynaptic terminal, thereby increasing the concentration of the neurotransmitter available to bind to postsynaptic receptors.

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