Newer non sedating antihistamines

One reason, which may be the most reasonable, is that histamine is known to reduce the appetite, and antihistamines, therefore, counteract this effect.Both Zyrtec and Claritin may make you drowsy or tired.While antihistamines may help you to fall asleep, overall sleep quality is usually not very good, he said.Antihistamines can cause drowsiness, which might help you fall asleep for a few nights — but routine use of antihistamines for insomnia isn't recommended. Good Rx is not available outside of the United States.

The main one for antihistamines is drowsiness, so it can be tough to take during the day.Most people prefer to take a non-drowsy antihistamine instead of a sedating one.3.If you are asking how long it takes for the quick onset of drowsiness to wear off when taking your normal dose of Seroquel, that is also a pretty variable thing between persons.Decongestants may keep you awake and are usually taken during the day.Like Claritin, Zyrtec and Alavert, Allegra is among the second-generation antihistamines, which means that unlike older meds such as diphenhydramine (Benadryl) and chlorphiniramine (Advil Allergy Sinus, Singlet), they won't make you drowsy.

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