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  2. Which Allergy Medicine Is Actually Most Effective? - AOL

    www.aol.com/lifestyle/allergy-medicine-actually...

    “Zyrtec can cause drowsiness,” Dr. Brooks says. “While not as frequent as for older antihistamines like Benadryl, I still see drowsiness with Zyrtec quite a bit. ... Claritin doesn’t cross ...

  3. Meclizine - Wikipedia

    en.wikipedia.org/wiki/Meclizine

    Meclizine, sold under the brand name Bonine, among others, is an antihistamine used to treat motion sickness and dizziness . [3] It is taken by mouth. [3] Effects generally begin in an hour and last for up to a day. [3] Common side effects include sleepiness and dry mouth. [3] Serious side effects may include allergic reactions. [3]

  4. Fexofenadine - Wikipedia

    en.wikipedia.org/wiki/Fexofenadine

    Fexofenadine does not readily cross the blood–brain barrier, so is less likely to cause drowsiness in comparison to other antihistamines that readily cross that barrier (i.e., first-generation antihistamines such as diphenhydramine). In general, fexofenadine takes about an hour to take effect, though this may be affected by the choice of ...

  5. Clemastine - Wikipedia

    en.wikipedia.org/wiki/Clemastine

    Clemastine is an antihistamine with anticholinergic and sedative effects. Antihistamines competitively bind to histamine receptor sites, thus reducing the neurotransmitter's effects. [9] Effects of histamine (which are countered by antihistamines) include: Increased capillary permeability; Increased capillary dilatation; Edema (i.e., swelling ...

  6. Antihistamine - Wikipedia

    en.wikipedia.org/wiki/Antihistamine

    Older people are more likely to experience drowsiness from antihistamine use than younger people. [1] Continuous and/or cumulative use of anticholinergic medications, including first-generation antihistamines, is associated with higher risk for cognitive decline and dementia in older people. [31] [32]

  7. Levocetirizine - Wikipedia

    en.wikipedia.org/wiki/Levocetirizine

    Levocetirizine, sold under the brand name Xyzal, among others, is a second-generation antihistamine used for the treatment of allergic rhinitis (hay fever) and long-term hives of unclear cause. [3] It is less sedating than older antihistamines. [4] It is taken by mouth. [3] Common side effects include sleepiness, dry mouth, cough, vomiting, and ...