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Another type of antihistamines known as H2-antihistamines are used to treat gastrointestinal conditions caused by excessive stomach acid. [8] Mechanism. H-1 antihistamines work by inhibiting histamine from binding to H-1 receptors. Histamine receptors expressed in smooth muscles, vascular endothelial cells, the heart, and the central nervous ...
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 ...
H 1-antihistamines work by binding to histamine H 1 receptors in mast cells, smooth muscle, and endothelium in the body as well as in the tuberomammillary nucleus in the brain. Antihistamines that target the histamine H 1 -receptor are used to treat allergic reactions in the nose (e.g., itching, runny nose, and sneezing).
PET studies with antihistamines have found that brain H 1 receptor occupancy of more than 50% is associated with a high prevalence of somnolence and cognitive decline, whereas brain H 1 receptor occupancy of less than 20% is considered to be non-sedative. [46] Hydroxyzine also acts as a functional inhibitor of acid sphingomyelinase. [47]
Tripelennamine, sold under the brand name Pyribenzamine by Novartis, is a drug that is used as an antipruritic and first-generation antihistamine. It can be used in the treatment of asthma, hay fever, rhinitis, and urticaria, but is now less common as it has been replaced by newer antihistamines. The drug was patented at CIBA, which merged with ...
Loratadine, sold under the brand name Claritin among others, is a medication used to treat allergies. [5] This includes allergic rhinitis (hay fever) and hives. [5] It is also available in drug combinations such as loratadine/pseudoephedrine, in which it is combined with pseudoephedrine, a nasal decongestant. [5]
The original formula for Actifed contained pseudoephedrine hydrochloride 60 mg as the nasal decongestant and triprolidine hydrochloride 2.5 mg as the antihistamine. . However, in response to widespread laws requiring products containing pseudoephedrine to be kept behind the pharmacy counter, Pfizer changed Actifed's U.S. formula in late 2006 to contain phenylephrine HCl 10 mg as the nasal ...
Chloropyramine is a first-generation antihistamine drug approved in several Eastern European countries such as Russia for the treatment of allergic conjunctivitis, allergic rhinitis, bronchial asthma, and other atopic (allergic) conditions.