Adenosine is widely used in medicine, particularly in cardiology, as a rapid-acting antiarrhythmic agent. It is administered intravenously to treat certain types of irregular heartbeats, such as supraventricular tachycardia, by slowing down electrical conduction in the heart and restoring normal rhythm. Additionally, adenosine plays a role in diagnostic procedures like stress testing, where it helps evaluate blood flow to the heart muscle by mimicking the effects of exercise. In research, adenosine is studied for its role in cellular signaling, inflammation, and energy transfer, particularly in relation to conditions like cancer, neurological disorders, and immune responses. It is also a key component in the production of ATP, which is essential for cellular energy.