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Antidepressants are medications that treat depression and other mood disorders by modulating neurotransmitter levels in the brain. The main classes include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), and monoamine oxidase inhibitors (MAOIs), each with distinct mechanisms and side effect profiles.
Depression is associated with dysregulation of monoamine neurotransmitters, particularly serotonin, norepinephrine, and dopamine in synaptic clefts. Antidepressants work by blocking reuptake transporters, inhibiting metabolic enzymes, or modulating receptor activity to increase available neurotransmitter concentrations. This enhanced neurotransmission helps restore normal mood regulation and neuroplasticity over time.
Selection of antidepressants requires consideration of patient-specific factors including symptom profile, comorbidities, drug interactions, and tolerance to side effects. SSRIs are typically first-line due to their favorable safety profile, while SNRIs may be preferred for patients with concurrent pain or fatigue. Therapeutic effects often require 4-6 weeks to manifest, and dosage adjustments should be made gradually to optimize efficacy while minimizing adverse effects.