Antidepressants are medications used to treat depression and other mental health conditions such as anxiety disorders, obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD). They work by balancing neurotransmitters in the brain, such as serotonin, dopamine, and norepinephrine, which play a key role in regulating mood and emotions. Common types of antidepressants include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and tricyclic antidepressants (TCAs). While these medications can be effective, they may take weeks to show results and can cause side effects like nausea, weight changes, and drowsiness. It is important to use antidepressants under medical supervision to ensure safe and effective treatment.