Methyxanthines (related substances)

Methyxanthines are natural compounds found in plants like coffee, tea, and cocoa, notably caffeine, theobromine, and theophylline. They act as stimulants by blocking adenosine receptors in the brain, reducing feelings of tiredness and increasing alertness. Methyxanthines can also relax airway muscles and improve breathing, which is why theophylline is used in asthma treatment. However, they can cause side effects such as increased heart rate, insomnia, and jitteriness if consumed in excess. These substances are commonly found in beverages and medications to boost mental focus, alertness, and respiratory function.