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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.
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 ...
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 .
Ketotifen is an antihistamine medication and a mast cell stabilizer used to treat allergic conditions such as conjunctivitis, asthma, and urticaria (hives).Ketotifen is available in ophthalmic (eye drops or drug-eluting contact lenses) and oral (tablets or syrup) forms: the ophthalmic form relieves eye itchiness and irritation associated with seasonal allergies, while the oral form helps ...
When suffering from Cyanopsia some individuals may also experience blurred vision, or heightened sensitivity to bright light, which can make well-lit environments uncomfortable. [3] The condition is typically temporary and does not cause pain or physical discomfort.
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]
Doxylamine and other first-generation antihistamines are the most widely used sleep medications in the world. [6] Typical side effects of doxylamine (at recommended doses) include dizziness, drowsiness, grogginess, and dry mouth, among others. [7] [4] As an antihistamine, doxylamine is an inverse agonist of the histamine H 1 receptor.
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 ...