Coreg is a prescription medication used to treat high blood pressure and heart failure. It works by blocking certain receptors in the body, allowing the heart to beat more slowly and with less force. This helps to lower blood pressure and improve heart function. Coreg is also known by its generic name, carvedilol, and is available in tablet form. It is typically taken once or twice a day, as directed by a doctor. Common side effects of Coreg may include dizziness, fatigue, and low blood pressure. It is important to follow the prescribed dosage and consult with a healthcare professional before starting or stopping this medication.