Amphetamine is a kind of psychotropic drug, its chemical composition is amphetamine sulfate, available ephedrine hydrochloride for synthesis, can be temporary excitation of the central nervous system, the clinical used to treat asthma, narcolepsy, ADHD and other diseases. Amphetamine belongs to the state controlled drugs, there is a certain degree of toxicity and addiction, not long-term use, should be under the guidance of a professional doctor to buy and take. If patients take amphetamines for a long time or in large quantities, they may become dependent on the drug and may be poisoned. 1, systemic symptoms: patients with mild poisoning, there may be headaches, high fever, night sweats, and a significant loss of appetite or even disappearance of symptoms; 2, psychiatric symptoms: patients with more severe poisoning, in addition to the above mild symptoms of poisoning, there may be psychiatric symptoms, such as paranoia 3, withdrawal reactions: If patients suddenly stop taking amphetamines, they may also experience emotional irritability, irritability, restlessness, trembling, apprehension and other symptoms; 4, other: long-term heavy use of amphetamines can also cause some effects on the cardiovascular and endocrine systems, resulting in increased heart rate, myocardial infarction, growth inhibition and other conditions. Because amphetamines can stimulate the central nervous system, and there is a certain degree of toxicity, addiction, some people should be prohibited amphetamines, such as hypertensive patients, patients with hyperthyroidism, glaucoma patients, patients with a history of drug addiction, etc.. In addition, pregnant women, the elderly, children, and patients with liver and kidney diseases should also use this drug with caution.