Antihistamines are a large class of anti-allergic drugs and drugs for the treatment of motion sickness, commonly used are chlorpheniramine maleate, loratadine, epalrestine, cetirizine, benadryl, betahistine, etc. They are generally used to treat allergic diseases and dizziness symptoms caused by various reasons, etc. For allergic diseases, it is also necessary to improve one’s immunity by identifying allergens and staying away from them. Exercise more and get more sunlight during the day. At the same time, the cause of the dizziness should be identified and treated. It is also necessary to improve nutrition, enhance physical fitness to eat more fruits and vegetables, low-fat, low-sugar, low-salt diet, through proper physical exercise and diet control adjustment, sleep adjustment, can improve the occurrence of allergic diseases and dizziness. Antihistamines tend to cause sleep disorders and symptoms of drowsiness, and some people also experience transient abnormalities in liver and kidney function.