Selective serotonin reuptake inhibitors (SSRIs) are a class of medications commonly used to treat depression and anxiety disorders. They work by increasing the levels of serotonin, a neurotransmitter that helps regulate mood, in the brain. By preventing the reabsorption of serotonin into neurons, SSRIs enhance its availability, which can improve emotional well-being. Common SSRIs include fluoxetine, sertraline, and escitalopram. These medications are generally considered safe and effective, but they may have side effects such as nausea, insomnia, or sexual dysfunction. It is important for individuals to consult with a healthcare provider to determine the best treatment options for their specific needs.