Adenosine is an endogenous nucleoside occurring in all cells of the body. It is chemically 6-amino-9-b-D-ribofuranosyl-9-H-purine and has a following molecular formula C₁₀H₁₃N₅O₄ with a molecular weight of 267.24 and has the following structural formula:

Adenosine is a white crystalline powder. It is soluble in water and practically insoluble in alcohol. Solubility increases by warming and lowering the pH. Adenosine is not chemically related to other antiarrhythmic drugs. Adenocard^®(adenosine injection) is a sterile, nonpyrogenic solution for rapid bolus intravenous injection. Each mL contains 3 mg adenosine and 9 mg sodium chloride in Water for Injection. The pH of the solution is between 4.5 and 7.5.

The Ansyr^® plastic syringe is molded from a specially formulated polypropylene. Water permeates from inside the container at an extremely slow rate which will have an insignificant effect on solution concentration over the expected shelf life.

Solutions in contact with the plastic container may leach out certain chemical components from the plastic in very small amounts; however, biological testing was supportive of the safety of the syringe material.

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