Some people find certain types work well for them and others do not.
Antihistamines are designed to block the effects of the histamine that your body produces.
In turn, they decrease the symptoms of the allergy.
Their main benefit is they primarily affect peripheral histamine receptors and therefore are less sedating.
However, high doses can still induce drowsiness through acting on the central nervous system.
Among the most popular over-the-counter (OTC) allergy meds are Zyrtec and Claritin.