Serotonin-noradrenaline reuptake inhibitors, or SNRIs, are a type of medication that helps improve mood and reduce anxiety. They work by increasing the levels of two important chemicals in the brain: serotonin and noradrenaline. These chemicals help control mood, energy, and focus. 

By stopping the brain from reabsorbing (or “reuptaking”) these chemicals too quickly, SNRIs help them stay active longer, which can improve mood and help people feel less anxious or depressed. Doctors prescribe SNRIs for conditions like depression, anxiety, and sometimes pain.