Metadona is a medication primarily used to treat opioid addiction and manage chronic pain. It is a long-acting synthetic opioid that helps reduce withdrawal symptoms and cravings in individuals recovering from addiction to stronger opioids like heroin or morphine. In addition to its use in addiction treatment, metadona can also be prescribed for pain relief in patients who require continuous opioid therapy. It works by binding to the same receptors in the brain as other opioids, but its effects last longer, making it a useful option for both pain management and addiction recovery.