What is the primary action of selective serotonin reuptake inhibitors (SSRIs)?

What is the primary action of selective serotonin reuptake inhibitors (SSRIs)?

• A. They increase serotonin levels by blocking its reuptake
• B. They decrease serotonin synthesis
• C. They block norepinephrine reuptake
• D. They enhance dopamine release

Answer: (A)

SSRIs’ primary action is to block the serotonin transporter, preventing the reuptake of serotonin from the synaptic cleft back into the presynaptic neuron. By inhibiting this reuptake, more serotonin remains available in the space between neurons, boosting serotonergic signaling and helping to improve mood and anxiety symptoms over time. These drugs are selective for serotonin at typical therapeutic doses, so they have less direct impact on norepinephrine or dopamine compared to other antidepressants. They don’t decrease serotonin synthesis, nor do they primarily block norepinephrine reuptake or enhance dopamine release, which is why the blocking of serotonin reuptake best captures their mechanism.

SSRIs’ primary action is to block the serotonin transporter, preventing the reuptake of serotonin from the synaptic cleft back into the presynaptic neuron. By inhibiting this reuptake, more serotonin remains available in the space between neurons, boosting serotonergic signaling and helping to improve mood and anxiety symptoms over time. These drugs are selective for serotonin at typical therapeutic doses, so they have less direct impact on norepinephrine or dopamine compared to other antidepressants. They don’t decrease serotonin synthesis, nor do they primarily block norepinephrine reuptake or enhance dopamine release, which is why the blocking of serotonin reuptake best captures their mechanism.