Antihistamines are also commonly known as anti-allergy drugs, these drugs include paracetamol, cephradine, promethazine, ketotifen, as well as Xithromax, terfenadine, cetirizine hydrochloride, levocetirizine hydrochloride, loratadine, desloratadine, etc. These are all antihistamines. However, during the use of antihistamines, it should be noted that they may cause mild dizziness, weakness, drowsiness and other adverse reactions, so it is advisable not to drive, work at height or engage in delicate work, etc. during the use of this type of drugs. In order to reduce or alleviate the central depressive effects, it is recommended to use these drugs at night before going to bed.