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H 1-antihistamines can be administered topically (through the skin, nose, or eyes) or systemically, based on the nature of the allergic condition. The authors of the American College of Chest Physicians Updates on Cough Guidelines (2006) recommend that, for cough associated with the common cold, first-generation antihistamine-decongestants are ...
First-generation antihistamines can easily cross the blood-brain barrier into the central nervous system to reach the H-1 receptors within, often causing drowsiness. [7] Second-generation antihistamines selectively bind to the peripheral H-1 receptors outside the blood-brain barrier, therefore they are less likely to cause sedation.
Cinnarizine is an antihistamine and calcium channel blocker of the diphenylmethylpiperazine group. [5] It is prescribed for nausea and vomiting due to motion sickness [6] or other sources such as chemotherapy, [7] vertigo, [8] or Ménière's disease. [9] Cinnarizine is one of the leading causes of drug-induced parkinsonism. [5]
Benzatropine is a centrally acting anticholinergic and antihistamine. In terms of its anticholinergic activity, it is specifically an antimuscarinic and acts a selective muscarinic acetylcholine M 1 and M 3 receptor antagonist. [16] Benzatropine partially blocks cholinergic activity in the basal ganglia.
Cyproheptadine is a very potent antihistamine or inverse agonist of the H 1 receptor. At higher concentrations, it also has anticholinergic , antiserotonergic , and antidopaminergic activities. Of the serotonin receptors , it is an especially potent antagonist of the 5-HT 2 receptors .
Diphenhydramine, sold under the brand name Benadryl among others, is an antihistamine and sedative.It is a first-generation H 1-antihistamine and it works by blocking certain effects of histamine, which produces its antihistamine and sedative effects.