I can't stay focused. I feel sleepy all the time. When I am trying to learn something it is like nightmare. My head just start to fall down when I am reading. But that's not all. Yesterday I have fall asleep in the bus like some drunkard. I think that it is caused by antihistamines that I use to control allergy symptoms. Do Antihistamines cause sleepiness?
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Yes, and that is one of the most usual side effect of antihistamines. I don't know which antihistamine you are using but the older types which are cheaper and because of that more popular are well known for causing sleepiness. They are very dangerous and responsible for numerous car crashes over the years. They can have same effect on the brain like alcohol.
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