At present, the second generation antihistamines are mainly used in clinical practice, and the first generation anti-sensitizers have not been withdrawn from clinical application because of their unique anti-sensitizing effect. Cetirizine hydrochloride should be the most widely used antihistamine in clinical use at present. The Centrumine you see in the picture is an imported original product, which should be the most used imported antihistamine in clinical use at present. The effect is reduced. Although the side effects of second generation antihistamines such as drowsiness have been significantly better than the first generation antihistamines, but it can not be said that there is no drowsiness and other side effects, Xanthemin is still some drowsiness, some patients will feel sleepy after taking it, but the anti-sensitivity effect is still relatively good, if you feel sleepy after taking it, it is recommended not to drive, Coretan will also have some patients feel slightly sleepy, but less than Xanthemin. The drug name of Xanthemin is Cetirizine Hydrochloride, and the drug name of Keratan is Loratadine. Both of these drugs are currently available in China from many pharmaceutical companies that produce domestic products, and we should be able to meet the basic needs of the clinic as long as we pay attention to choosing a manufacturer with strict quality.