Side effects of stimulants include dependence, withdrawal reactions, personality changes, etc. 1. Dependence: If patients use stimulants for a long period of time or in large quantities, it may lead to dependence on the drug, which makes the patients mentally crave for cyclic or continuous use of the drug and compulsive drug-using behaviors so as to obtain a sense of comfort. 2. Withdrawal reaction: It is due to the patient’s long-term use of the drug leading to dependence, and sudden stopping or reducing the dosage may lead to withdrawal reaction, i.e., symptoms such as depression, anxiety, excitement, hallucinations, hallucinations, and epileptic seizures. 3. Personality change: Usually after using stimulants, patients may have serious personality changes, easily manifested as irritability, agitation, mania and other symptoms. If the above symptoms occur after the use of drugs, it is recommended to go to a professional consultation in a timely manner, and under the guidance of the doctor for further examination and treatment.