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I've taken the Non-Drowsy ones. I didnt feel any more drowsy. Driving and/or going to work after a Non-Drowsy Allergy Medication (i.e Claritin) is fine. Dont worry about it.

Yes, even the ones that are labeled "non-drowsy" will make you tired after the anti-drowsy ingredient wears off.

Yes they do. You shouldn't drive or take it when you have to be up (like at work or school). I usually take antihistamines when needed if I don't have to go anywhere or when I go to bed.