Used historically as an antidepressant, this compound was one of the first monoamine oxidase inhibitors (MAOIs) developed for the treatment of depression. It works by increasing levels of neurotransmitters such as serotonin, dopamine, and norepinephrine in the brain, which helps improve mood and emotional well-being. Although largely replaced by newer antidepressants with fewer side effects and dietary restrictions, it played a key role in the early understanding and pharmacological treatment of mental health disorders. Its use today is limited due to safety concerns, including liver toxicity and interactions with certain foods and drugs.