Adenosine is a molecule that plays a crucial role in various biological processes. It is a nucleoside that is composed of adenine and ribose. There are several synonyms for adenosine, such as Adenocine, Adenylate, Adenin-9-beta-D-ribofuranoside, and Adenine riboside. Adenosine is produced by the breakdown of adenosine triphosphate (ATP), which is the primary source of energy for the body's cells. It is also involved in regulating blood flow and heart rate. Adenosine has many therapeutic uses, including treating certain types of arrhythmias and improving blood flow to the heart. It is also used to promote sleep, as it has a calming effect on the brain.