English name:Diphenhydramine Hydrochloride CAS:147-24-0 Molecular formula:C17H22ClNO Molecular weight:291.82 Specification:10kg/bag/barrel Registration number:Y20230001131 Registration state:I Diphenhydramine hydrochloride competes with histamine released from the tissue for H1 receptors on effectant cells, thereby preventing allergic reactions from occurring. It can relieve the cramping and congestion caused by histamine. In addition, it also has a relatively strong analgesic effect. It is mainly used for skin and mucous membrane allergy, such as urticaria, atopic dermatitis, skin pruritus, drug rash.