Final answer:
Dose-dependent QTc prolongation is associated with the use of antipsychotic medications, not selective serotonin reuptake inhibitors (SSRIs), which increase serotonin levels in the central nervous system to treat depression.
Step-by-step explanation:
Dose-dependent QTc prolongation can be seen in patients treated with certain classes of antipsychotic medications. These medications can impact the heart's electrical conduction system, leading to prolonged intervals on an electrocardiogram (ECG). Other treatments for psychological disorders, such as psychotherapy, electroconvulsive therapy, deep-brain stimulation, and the use of antidepressants like selective serotonin reuptake inhibitors (SSRIs), have different mechanisms of action and side effect profiles. SSRIs, such as Prozac, Paxil, and Zoloft, work by blocking the reuptake of serotonin into the presynaptic neuron, thereby increasing the levels of serotonin in the central nervous system without causing QTc prolongation.