Antidepressant medications are drugs used to treat depression and other mood disorders. They work by balancing chemicals in the brain, such as serotonin and norepinephrine, which affect mood and emotions. Common types include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and tricyclic antidepressants. These medications can help improve symptoms like sadness, anxiety, and lack of interest in daily activities. It may take several weeks to notice their full effects, and they are often prescribed alongside therapy for better results. Always consult a healthcare professional before starting or stopping any medication.