Allergies
"First time using Xyzal last night for allergies. Normally, I take Benadryl but wanted to give this product a try as it&#039;s new OTC. I only took half a pill at bedtime. Yes, my allergic symptoms cleared up but WOW did it make me tired. I&#039;m thankful I have the day off as I don&#039;t know how I could function at work.  I expected some drowsiness but this far exceeds the effect of a full dose of Benadryl."