Selective Serotonin Reuptake Inhibitors, or SSRIs, are a class of medications commonly used to treat depression and anxiety disorders. They work by increasing the levels of serotonin, a neurotransmitter in the brain that helps regulate mood, by preventing its reabsorption into neurons. This action enhances mood and emotional stability. SSRIs are often prescribed due to their relatively mild side effects compared to older antidepressants. Common examples include fluoxetine, sertraline, and escitalopram. While effective for many, they may not work for everyone, and it is important for patients to consult with their healthcare provider for personalized treatment options.