"i took 2 25mg pills last night.  woke up today with bad headache and dry mouth. i had some bizarre dreams on the stuff and felt a bit of an antihistamine hangover.  a few convulsions in my sleep.  i think next time i will try 12.5 mg&#039;s.  i have a tolerance to everything except antihistamines for some reason.  i did not care for the crappy side effects i experienced upon waking up the next day.  dehydrated, sluggish, dizzy, depressed, dry mouth"