The various types of antidepressant medications include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), and monoamine oxidase inhibitors (MAOIs). SSRIs, such as fluoxetine and sertraline, increase the levels of serotonin in the brain. SNRIs, such as venlafaxine and duloxetine, increase the levels of both serotonin and norepinephrine. TCAs, such as amitriptyline and nortriptyline, increase the levels of serotonin and norepinephrine, but also have a wider range of effects on other neurotransmitters. MAOIs, such as phenelzine and tranylcypromine, increase the levels of several neurotransmitters by inhibiting the enzyme that breaks them down. The choice of antidepressant medication depends on the individual's symptoms, medical history, and potential side effects.