I took it for the severe allergies I have.
I am allergic to anything and everything.. even benadryl so you can imagine how bad they must be. That's why, pretty much Claritin-D 24 hours was the only option. It did not do anything for me.. infact, it was horrible. It made my mouth extremely dry.. I had to keep drinking water and even that didn't help much. So after 4 times of taking it, my doctor told me to stop.
I can totally relate to the dry mouth and insomnia it causes but boy did it work for me. Regular claritin just does not cut if for me, despite of all the side effects, I am taking claritin-D.