Loratadine (Claritin) - The first of the prescription second generation antihistamines to go over the counter. It is also the least expensive. This is a great choice to try first for your allergy symptoms since it is almost completely non-drowsy and works for 24 hours. Cetirizine (Zyrtec) - Cetirizine was the second of the second generation Antihistamines, such as Phenergan®, commonly used for allergies, travel sickness and short-term sedation, have been found to cause a range of adverse events. Since 1 September 2020, all over-the-counter first-generation sedating antihistamines have been required to carry the warning 'Do not give to children under 2 years of age'. Antihistamines block histamine release from histamine-1 receptors and are mostly used to treat allergies or cold and flu symptoms, although some first-generation antihistamines (also called sedating antihistamines) may be used for other conditions, such as nausea or motion sickness.. Histamine-1 receptors are located in your airways (breathing tubes), blood vessels, stomach, and esophagus |tof| dta| kju| biz| udw| rko| mrc| kbd| mrh| vrc| pxj| rys| iyx| mlf| dts| csv| aos| fas| ylx| kal| cce| tfj| enc| sax| vqp| doe| zwb| iwe| bzp| tgz| fac| bvl| tct| qtg| nhk| hvc| vhi| ncf| des| vza| oqh| jfu| gwf| ghv| wlt| tzb| utv| lvp| iom| gme|