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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.
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. [11] [2] Diphenhydramine is also a potent anticholinergic. [12]
Vicks NyQuil is a brand of over-the-counter medication manufactured by Procter & Gamble intended for the relief of various symptoms of the common cold.All medications within the NyQuil imprint contain sedating antihistamines, hypnotics, and/or alcohol; they are intended to be taken before sleep.
Benadryl containing diphenhydramine can interact with alcohol as both are central nervous system (CNS) depressants. Side effects such as drowsiness and dizziness may be enhanced when taking alcohol with diphenhydramine. [16] Mixing diphenhydramine with alcohol can also increase the chances of losing consciousness due to sedation. [17]
Chlorphenamine is an alkylamine and is a part of a series of antihistamines including pheniramine (Naphcon) and its halogenated derivatives including fluorpheniramine, dexchlorphenamine (Polaramine), brompheniramine (Dimetapp), dexbrompheniramine (Drixoral), deschlorpheniramine, and iodopheniramine.
Oral administration: In adults, 25 mg can be taken 3 to 4 times daily (up to 150 mg); in children over 5 years old, 25 mg can be taken 2 to 3 times daily. For external application, the skin or the eye conjunctiva can be treated up to several times a day by applying a thin layer of cream or ointment containing 1% chloropyramine hydrochloride.
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 .
Coricidin, Coricidin 'D' (decongestant), or Coricidin HBP (for high blood pressure), is the name of an over-the-counter cough and cold drug containing dextromethorphan (a cough suppressant) and chlorpheniramine maleate (an antihistamine). [1] Introduced by Schering-Plough in 1949 as one of the first antihistamines, it is now owned by Bayer.