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The newer, second-generation H 1-antihistamines are far more selective for peripheral histamine H 1-receptors and have a better tolerability profile compared to the first-generation agents. The most common adverse effects noted for second-generation agents include drowsiness, fatigue, headache, nausea and dry mouth. [4]
The introduction of the first-generation antihistamines marked the beginning of medical treatment of nasal allergies. [28] Research into these drugs led to the discovery that they were H 1 receptor antagonists and also to the development of H 2 receptor antagonists , where H 1 -antihistamines affected the nose and the H 2 -antihistamines ...
Cetirizine is a second-generation antihistamine used to treat allergic rhinitis (hay fever), dermatitis, and urticaria (hives). [5] It is taken by mouth. [6] Effects generally begin within thirty minutes and last for about a day. [6] The degree of benefit is similar to other antihistamines such as diphenhydramine, which is a first-generation ...
First-generation antihistamines usually last around 4–6 hours whilst second-generation antihistamines work for 12–24 hours. [7] Third generation antihistamines are metabolites of the second-generation antihistamines but without cardiac toxicity. [8] Indications and route of administration
It is a first-generation antihistamine in the piperazine family of chemicals. [8] [4] Common side effects include sleepiness, headache, and dry mouth. [8] [9] Serious side effects may include QT prolongation. [9] It is unclear if use during pregnancy or breastfeeding is safe. [8]
Diphenhydramine is a first-generation antihistamine used to treat several conditions including allergic symptoms and itchiness, the common cold, insomnia, motion sickness, and extrapyramidal symptoms. [19] [20] Diphenhydramine also has local anesthetic properties, and has been used as such in people allergic to common local anesthetics such as ...
The first-ever needle-free alternative to the EpiPen and similar epinephrine autoinjectors has been approved by the Food and Drug Administration to treat anaphylaxis. Neffy, a nasal spray that ...
Cyproheptadine, sold under the brand name Periactin among others, is a first-generation antihistamine with additional anticholinergic, antiserotonergic, and local anesthetic properties. It was patented in 1959 and came into medical use in 1961. [5]
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