Benadryl Antihistamine Case Study

If the type of active ingredient in found in antihistamine type medications relates to the heart rate of a Daphnia magna (water flea) through its respiration, then Benadryl will significantly reduce the heart rate of the Daphnia after 2 minutes compared to Zyrtec and Claritin, whose ingredients will cause an increase in heart rate after 2 minutes. Benadryl is a first-generation antihistamine that contains diphenhydramine as the active ingredient, Zyrtec is a second-generation antihistamine that contains cetirizine hydrochloride as the active ingredient, and Claritin is also a second-generation antihistamine, but it contains loratadine as the active ingredient. Benadryl will be substantially more effective because diphenhydramine easily crosses