How Major Depressive Disorder Medications Work

Major Depressive Disorder (MDD) is a complex condition characterized by persistent feelings of sadness, loss of interest in activities, and changes in appetite or sleep patterns. The primary goal of medication treatment for MDD is to restore the balance of neurotransmitters in the brain.

Gold Standard: Selective Serotonin Reuptake Inhibitors (SSRIs)

The gold standard for treating MDD is Selective Serotonin Reuptake Inhibitors (SSRIs). SSRIs work by increasing the levels of serotonin, a neurotransmitter that helps regulate mood, appetite, and sleep. They do this by blocking the reabsorption of serotonin into the presynaptic neuron, allowing more serotonin to be available for binding to receptors on adjacent neurons.

Alternatives: Serotonin-Norepinephrine Reuptake Inhibitors (SNRIs) and Others

• Serotonin-Norepinephrine Reuptake Inhibitors (SNRIs): SNRIs are a second-line treatment option for patients who do not respond to SSRIs. They work by blocking the reabsorption of both serotonin and norepinephrine, increasing the levels of these neurotransmitters in the brain.

• Tricyclic Antidepressants (TCAs): TCAs are a backup treatment option for patients who do not respond to SNRIs. They work by blocking the reabsorption of serotonin and norepinephrine, as well as other neurotransmitters.

• Monoamine Oxidase Inhibitors (MAOIs): MAOIs are rarely used due to their potential for serious side effects and dietary restrictions. They work by blocking the enzyme monoamine oxidase, which breaks down serotonin and norepinephrine in the brain.