Caffeine,theophylline,and theobromine are classified as methylxanthines and are found in nature.Methylxanthines can be described as:

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Caffeine, theophylline, and theobromine are plant compounds found naturally in tea, cocoa, and coffee. These compounds, classified as methylxanthines, produce mild stimulation of the central nervous system, heart, and kidneys. Other physiological actions include relaxation of smooth muscle (bronchodilation) and increased skeletal muscle tone and strength of contraction.

Caffeine,theophylline,and Theobromine Are Classified as Methylxanthines and Are Found in Nature.Methylxanthines