👉 Phenelzine is a medication used to treat depression. It works by blocking a chemical in your brain that causes feelings of sadness, hopelessness, and fatigue. This helps to improve symptoms of depression. It's often prescribed for long-term use because it can be very addictive. However, it should only be taken under the guidance of a healthcare professional who knows what it is used for and how it works. If you're considering taking this medication, it's important to talk with your doctor