Further, laws are in effect in many states banning the use of an automobile when under the influence of a sedating drug or alcohol.
One of the main side effects of antihistamines is a feeling of sedation, according to Columbia University’s health information website, Go Ask Alice.
First generation antihistamines, such as diphenhydramine and fexofenadine can cause more severe impairment when combined with alcohol than being legally drunk, according to researchers from the University of Iowa.
In the 2000 study, researchers tested volunteers’ alertness on a driving simulator after taking a first-generation cold drug in addition to alcohol.
Consumer Reports reviewed all major allergy medications and found that monthly costs range considerably depending on which one you choose.With or without a decongestant, Allegra, Claritin, and Zyrtec are all antihistamines, meaning they calm down your body's immune reaction to allergens like pollen or animal dander.