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2. Cetirizine - Wikipedia

   en.wikipedia.org/wiki/Cetirizine

   A positron emission tomography (PET) study found that brain occupancy of the H 1 receptor was 12.6% for 10 mg cetirizine, 25.2% for 20 mg cetirizine, and 67.6% for 30 mg hydroxyzine. [30] (A 10 mg dose of cetirizine equals about a 30 mg dose of hydroxyzine in terms of peripheral antihistamine effect.) [31] PET studies with antihistamines have ...

3. Hydroxyzine - Wikipedia

   en.wikipedia.org/wiki/Hydroxyzine

   Hydroxyzine works by blocking the effects of histamine. [9] It is a first-generation antihistamine in the piperazine family of chemicals. [8] [4] Common side effects include sleepiness, headache, and dry mouth. [8] [9] Serious side effects may include QT prolongation. [9] It is unclear if use during pregnancy or breastfeeding is safe. [8]

4. Bilastine - Wikipedia

   en.wikipedia.org/wiki/Bilastine

   Clinical studies using different dosages were done on histamine-induced wheal and flare reaction over a 24-h period, compared with a single 10 mg oral dose of cetirizine. [25] The results of this research indicated that bilastine was at least as efficient as cetirizine in reducing histamine-mediated effects in healthy volunteers.

5. Pitolisant - Wikipedia

   en.wikipedia.org/wiki/Pitolisant

   Eugeroics are different from traditional CNS stimulants such as amphetamine in that they have fewer side effects and lower abuse potential. Pitolisant is the first eugeroic drug that acts by blocking the histamine H 3 autoreceptor, which increases the activity of histamine neurons in the brain. Pitolisant has been shown to be effective and well ...

6. 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 ...

7. Ebastine - Wikipedia

   en.wikipedia.org/wiki/Ebastine

   Ebastine is a H 1 antihistamine with low potential for causing drowsiness.. It does not penetrate the blood–brain barrier to a significant amount and thus combines an effective block of the H 1 receptor in peripheral tissue with a low incidence of central side effects, i.e. seldom causing sedation or drowsiness.