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  2. H3 receptor antagonist - Wikipedia

    en.wikipedia.org/wiki/H3_receptor_antagonist

    An H 3 receptor antagonist is a type of antihistaminic drug used to block the action of histamine at H 3 receptors.. Unlike the H 1 and H 2 receptors which have primarily peripheral actions, but cause sedation if they are blocked in the brain, H 3 receptors are primarily found in the brain and are inhibitory autoreceptors located on histaminergic nerve terminals, which modulate the release of ...

  3. H1 antagonist - Wikipedia

    en.wikipedia.org/wiki/H1_antagonist

    The most common adverse effects noted for second-generation agents include drowsiness, fatigue, headache, nausea and dry mouth. [4] 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. [8] [9]

  4. List of long term side effects of antipsychotics - Wikipedia

    en.wikipedia.org/wiki/List_of_long_term_side...

    The percentage of patients affected by side effects like Tardive dyskinesia is significantly high and estimated to be a 20-50% prevalence. [1] [2] These side effects are serious and some of them are permanent, and many remain a crucial concern for companies and healthcare professionals and substantial efforts are being encouraged to reduce the ...

  5. Antihistamine - Wikipedia

    en.wikipedia.org/wiki/Antihistamine

    Antihistamines are drugs which treat allergic rhinitis, common cold, influenza, and other allergies. [1] Typically, people take antihistamines as an inexpensive, generic (not patented) drug that can be bought without a prescription and provides relief from nasal congestion, sneezing, or hives caused by pollen, dust mites, or animal allergy with few side effects. [1]

  6. Diphenhydramine - Wikipedia

    en.wikipedia.org/wiki/Diphenhydramine

    The most prominent side effects are dizziness and sleepiness. [44] Diphenhydramine is a potent anticholinergic agent and potential deliriant in higher doses. This activity is responsible for the side effects of dry mouth and throat, increased heart rate, pupil dilation, urinary retention, constipation, and, at high doses, hallucinations or ...

  7. Histamine agonist - Wikipedia

    en.wikipedia.org/wiki/Histamine_agonist

    A histamine agonist is a drug which causes increased activity at one or more of the four histamine receptor subtypes. H 1 agonists promote wakefulness. [1] H 2: Betazole and Impromidine are examples of agonists used in diagnostics to increase histamine. H 3: Betahistine is a weak Histamine 1 agonist and a very strong antagonist of the Histamine ...

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