Caffeine in coffee.

Caffeine: (Caffeine) is an alkaloid extracted from tea and coffee fruits. Moderate use of caffeine can dispel fatigue and excitatory nerves. It is clinically used to treat neurasthenia and coma resuscitation. However, large doses or long-term use will also cause damage to the human body, especially it is addictive, once discontinued, there will be various withdrawal symptoms, such as mental fatigue, fatigue and weakness, although the addiction is weak, the withdrawal symptoms are not very serious. however, when the drug dosage is increasing due to drug tolerance, caffeine not only acts on the cerebral cortex, but also directly excites the medulla oblongata. It causes paroxysmal convulsion and bone tremor, damages important internal organs such as liver, stomach and kidney, induces respiratory tract inflammation, women's breast adenoma and other diseases, and even leads to mental retardation and limb deformity of the next generation of users. Therefore, it is also included in the scope of psychotropic substances under state control. Caffeine abuse usually has two forms of smoking and injection, and its excitatory stimulation, side effects, symptoms and drug dependence are similar to those of amphetamine. China has cracked a number of cases in which drug traffickers at home and abroad colluded to smuggle caffeine out of the "Golden Triangle" area. At present, the legal production of caffeine in China is greater than the legal demand, and the situation of illegal channels is more serious.