On all of these performance measures, loratadine has been shown to have effects comparable to placebo. In contrast, diphenhydramine, a common first‐generation antihistamine, usually available without a doctor's prescription, has significant adverse effects on vigilance, divided attention, working memory and psychomotor performance.Apr 4, 2000 · Introduction. Antihistamines are often used to treat the symptoms of allergies such as seasonal and perennial allergic rhinitis and urticaria. The first generation antihistamines have been associated with side effects, particularly sedation. 1 Second generation antihistamines are therefore favoured over the first generation drugs, not because of greatly improved efficacy but because they have ... Mar 13, 2023 · Loratadine is a long-acting, second-generation, non-sedating tricyclic antihistamine (piperidine derivative) with selective antagonistic properties to peripheral histamine H1-receptors. Loratadine selectively inhibits H1-receptors primarily located on respiratory smooth muscle cells, vascular endothelial cells, the gastrointestinal tract, and ... The H 1 antihistamine drugs therefore act as inverse agonists. 1 . Loratadine is metabolised in the ... compared to children treated with non-sedating antihistamines and healthy children. 5 Sedating antihistamines have been found to be a cause of aviation accidents. 3 An audit of media reports found a number of car accidents attributed to ...Non-sedating antihistamines should be preferentially used whenever possible as most antihistamines are equally efficacious, while adverse effects of sedating antihistamines can be serious. This ...First Generation Antihistamine have more potent Anticholinergic activity (sedation, Dry Mouth) Second Generation Antihistamines (e.g. Fexofenadine) are labeled as Non-Sedating Antihistamines; H2 Blockers (e.g. Cimetidine) are also Antihistamines. Although primarily active in suppressing acid secretion from the Stomach, H2 Blockers have some …Oct 12, 2022 ... These medicines may be used for their sedative effects should your sleep be disturbed by itching. Non-sedating or second-generation ...Overview · Examples of non-sedating over-the-counter antihistamines include fexofenadine (such as Allegra) and loratadine (such as Claritin). · Don't give .....Cetirizine is a second generation, non-sedating antihistamine, which selectively antagonises peripheral H 1-receptors and displays anti-allergic properties. It is a human metabolite of the sedating antihistamine, hydroxyzine (see summaries of product characteristics for cetirizine, for example, Zirtek).The first line treatment of urticaria is a daily non-sedating antihistamine at the age appropriate dose in adults and children. If there is inadequate response to treatment at the licensed dose the treatment options are: Switch to …Rupatadine is a modern non-sedating H1-antihistamine that also haswith additional antagonist effects on platelet-activating factor (PAF). Under the tradenames Rupafin® and Urtimed®, Rrupatadine is approvedregistered in Germany for the treatment of allergic rhinitis and urticaria infor adults and children aged over 12 years.Second- and third-generation antihistamines cause less drowsiness than first-generation antihistamines. They’re used to treat allergies. 2. OTC antihistamines are available under many different names. OTC antihistamines are found in many “combination” products for allergies, sleep, and cold or flu.Best Allergy Medicine: Antihistamines. We surveyed hundreds of pharmacists to collect their expert recommendations of the best allergy medicines. Zyrtec is the No. 1 allergy medicine followed by ... Side-effects, further information. Non-sedating antihistamines such as cetirizine hydrochloride cause less sedation and psychomotor impairment than the older antihistamines, but can still occur; sedation is generally minimal. This is because non-sedating antihistamines penetrate the blood brain barrier to a much lesser extent.non-drowsy antihistamines (also known as non-sedating antihistamines) – these are less likely to enter your brain and tend to cause less sleepiness as a result. Some people do sometimes feel drowsy even with these antihistamines, particularly at higher doses; You can get both types of antihistamine from pharmacies. Loratadine, a new antihistamine in the non-sedating class, was evaluated for efficacy and safety in treatment of allergic rhinitis in a multicentered study. Loratadine was found to be both safe and efficacious. When administered to patients with seasonal allergic rhinitis, a single daily oral dose of 10 mg is comparable in efficacy to ...Two of these non-sedating antihistamines, terfenadine and astemizole, have novel binding characteristics with the histamine H1 receptor, exhibiting irreversible binding at higher concentrations. In humans astemizole has a remarkably long half-life of elimination, on the order of 12 to 18 days for metabolites. Oct 28, 2017 · Loratadine (Claritin) - The first of the prescription second generation antihistamines to go over the counter. It is also the least expensive. This is a great choice to try first for your allergy symptoms since it is almost completely non-drowsy and works for 24 hours. Cetirizine (Zyrtec) - Cetirizine was the second of the second generation ... Non-sedating antihistamines (second generation) are more commonly used to avoid unnecessary drowsiness, and are generally the preferred option when prescribing for most allergic reactions. Fexofenadine and loratadine are most frequently recommended for urticaria. Antihistamine use and childrenNov 29, 2023 · Allegra is non-sedating, so drowsiness is not a common side effect, although it is possible. Allegra is also a second-generation antihistamine. Benadryl : This contains the active ingredient ... generation antihistamines are less likely to cross the blood- brain barrier and therefore produce less sedation. Although the first two second-generation ...FPnotebook.com is a rapid access, point-of-care medical reference for primary care and emergency clinicians. Started in 1995, this collection now contains 6407 interlinked topic pages divided into a tree of 31 specialty books and 722 chapters. Content is updated monthly with systematic literature reviews and conferences.Jul 10, 2023 · Antihistamines are a pharmaceutical class of drugs that act to treat histamine-mediated conditions. There are two main classes of histamine receptors: H-1 receptors and H-2 receptors. Antihistamine drugs that bind to H-1 receptors are generally used to treat allergies and allergic rhinitis. Drugs that bind to H-2 receptors can treat upper gastrointestinal conditions that are caused by ... Telfast is a non-sedating antihistamine which means it has been shown not to cause drowsiness. Telfast 60 mg tablets are used to relieve the symptoms of seasonal and perennial allergic rhinitis (including hayfever) in adults and …Antihistamines.These reduce or stop sneezing, runny noses, and itching. Examples of non-sedating over-the-counter antihistamines include fexofenadine (such as Allegra) and loratadine (such as Claritin). Older antihistamines like chlorpheniramine (such as Chlor-Tripolon) and diphenhydramine (such as Benadryl) are less expensive but can make you ...An antihistamine agent used for the symptomatic relief of seasonal allergic rhinitis such as sneezing, rhinorrhea, pruritus, lacrimation, and nasal congestion. Mizolastine: A second-generation non-sedating antihistamine used to treat symptoms of allergic rhinoconjunctivitis and urticaria. Bilastine Nov 15, 2019 · Antihistamines may be classified as sedating (first-generation antihistamines), and non-sedating (second-generation antihistamines). Both act on the H1 receptor, but the first-generation drugs act ... Antihistamines. When histamine, a chemical created by your immune system, overreacts to an allergen such as pollen and pet dander, it can cause symptoms such as coughing, sneezing and watery eyes. Antihistamines are medications that help with allergies, and also with stomach problems, cold, anxiety and more. Antihistamines are a class of drugs ...In most instances this nonsedating antihistamine was terfenadine (44.2%), followed by cetirizine (23.3%) and loratadine (16.3%). Table 1 Number of adverse drug reactions reported to LAREB until July 1999 categorized according to WHO-ART as system and organ class 1030 ‘heart rate and rhythm disorders’ sorted by type of arrhythmia.Side-effects, further information. Non-sedating antihistamines such as loratadine cause less sedation and psychomotor impairment than the older antihistamines, but can still occur; sedation is generally minimal. This is because non-sedating antihistamines penetrate the blood brain barrier to a much lesser extent.Sep 29, 2023 · Loratadine (brand example: Claritin), an over-the-counter (OTC) non-sedating antihistamine, does not usually increase blood pressure when used alone as a single ingredient. Some OTC combination products do contain loratadine plus the decongestant pseudoephedrine (brand example: Claritin-D), which can raise your blood pressure. There are no reported withdrawal symptoms for Benadryl if taken as directed. Benadryl is a brand name for the antihistamine diphenhydramine, which is not considered to be an addict...Currently, second generation non-sedating antihistamines are recommended as a first-line therapy by many international therapeutic guidelines for the management of allergic disorders such as allergic rhinitis and chronic idiopathic urticaria. Among the second generation H1-antihistamines, desloratadine is a relativelyNon‐sedating antihistamine Compared to placebo Duration = not specified in abstract but assumed to be 2 days: Outcomes: Decrease in severity score for rhinorrhoea, nasal congestion and/or sneezing between the start of treatment and day 2 Decrease in weight of nasal secretions between the start treatment and day 2: NotesTwo of these non-sedating antihistamines, terfenadine and astemizole, have novel binding characteristics with the histamine H1 receptor, exhibiting irreversible binding at higher concentrations. In humans astemizole has a remarkably long half-life of elimination, on the order of 12 to 18 days for metabolites.Conscious sedation is a combination of medicines to help you relax (a sedative) and to block pain (an anesthetic) during a medical or dental procedure. You will probably stay awake...Antihistamines.These reduce or stop sneezing, runny noses, and itching. Examples of non-sedating over-the-counter antihistamines include fexofenadine (such as Allegra) and loratadine (such as Claritin). Older antihistamines like chlorpheniramine (such as Chlor-Tripolon) and diphenhydramine (such as Benadryl) are less expensive but can make you ...Non-sedating antihistamines . These are the newer ‘second generation’ antihistamines. They’re less likely to make you feel sleepy. But this varies from person to person, so be aware that you might still be affected by drowsiness. Non-sedating antihistamines that you can buy from a pharmacy include: acrivastine (eg Benadryl Allergy Relief) Side effects of antihistamines that make you drowsy can include: sleepiness (drowsiness) and reduced co-ordination, reaction speed and judgement – do not drive or use machinery after taking these antihistamines. dry mouth. blurred vision. difficulty peeing. Side effects of non-drowsy antihistamines can include: headache. Side effects of first-generation antihistamines. Some of the more common side effects of first-generation antihistamines can include: drowsiness. dry mouth, nose, and throat. headache. Some side ...The author, date and country of publication, patient group studied, study type, relevant outcomes, results and study weaknesses of these best papers are ...Wheal numbers were reduced after treatment with 20 mg, but not 5 mg, desloratadine. In conclusion, the beneficial effects of non-sedating H1- antihistamines ...On all of these performance measures, loratadine has been shown to have effects comparable to placebo. In contrast, diphenhydramine, a common first-generation antihistamine, usually available without a doctor's prescription, has significant adverse effects on vigilance, divided attention, working memory and psychomotor performance.Antihistamines. Antihistamines (histamine H 1 -receptor antagonists) are classified as sedating or non-sedating, according to their relative potential for CNS depression. Antihistamines differ in their duration of action, incidence of drowsiness, and antimuscarinic effects; the response to an antihistamine may vary from child to child. Allegra is a non-sedating, second-generation antihistamine used to treat allergic rhinitis due to seasonal or perennial allergies, uncomplicated skin allergies, and chronic idiopathic urticaria. It is available as a tablet and an oral suspension in both prescription and over-the-counter formulations.Oct 18, 1997 ... Despite evidence for a mechanism whereby this widely used treatment for hay fever may cause ventricular arrhythmia or sudden death, it has ...Terfenadine, the first non-sedating antihistamine Arzneimittelforschung. 1982;32(9a):1154-6. Authors ... shown terfenadine to associate/dissociate with histamine H1-receptors much more slowly than a classical competitive antihistamine, chlorpheniramine.Antihistamines. When histamine, a chemical created by your immune system, overreacts to an allergen such as pollen and pet dander, it can cause symptoms such as coughing, sneezing and watery eyes. Antihistamines are medications that help with allergies, and also with stomach problems, cold, anxiety and more. Antihistamines are a class of drugs ...An antihistamine agent used for the symptomatic relief of seasonal allergic rhinitis such as sneezing, rhinorrhea, pruritus, lacrimation, and nasal congestion. Mizolastine: A second-generation non-sedating antihistamine used to treat symptoms of allergic rhinoconjunctivitis and urticaria. Bilastine Pharmacology of antihistamines James K. Woodward, PhD Cincinnati, Ohio Unlike the classic antihistamines, the new Hi-receptor antagonists do not block cholinergic or ... tween the classic antihistamines and the new non- sedating antihistamines. Although there are no ma- jor, well-defined differences in the pharmacologic profiles of these ...H. 1. antagonist. H1 antagonists, also called H1 blockers, are a class of medications that block the action of histamine at the H 1 receptor, helping to relieve allergic reactions. Agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines; other agents may have antihistaminergic ...Newer antihistamines are said to be non-sedating, although some users may experience drowsiness even from these. All antihistamines work in the same way: by competing with histamine to prevent or reduce the characteristic signs and symptoms of an allergic reaction: swelling, tearing, itching, and increase in bronchial and other secretions. How They Work: Antihistamines used to treat allergy symptoms fall into two broad categories: sedating and non-sedating. The first category includes the older antihistamines.These allergy drugs relieve allergy symptoms but cause drowsiness and other side effects, including dry mouth.Newer antihistamines are said to be non …Non - sedating antihistamines such as Cetirizine (Zyrtec) and Loratadine (Claritin)may be needed to get symptom relief. Sedating antihistamines such as Chlorphenamine (Benadryl) is used at night to get urticaria control. Short courses of oral cortisone or steroids are taken for short periods (one to three days) to settle more severe symptoms.If symptoms persist despite regular emollients and self-care advice, consider a short-term trial of a non-sedating oral antihistamine (off-label indication), such as cetirizine 10 mg, loratadine 10 mg, or fexofenadine 180 mg for 2–3 weeks. See the sections on Cetirizine, Loratadine, and Fexofenadine in Prescribing information for more ...Nov 26, 2014 ... The use of double approved doses of fexofenadine, rupatadine, or bilastine shows an objective improvement in most (>50%) of patients that ...First-generation antihistamines block both histaminic and muscarinic receptors as well as passing the blood-brain barrier. Second-generation antihistamines mainly block histaminic receptors but do not or only minimally cross the blood-brain barrier. The older first-generation antihistamines cause sedation, drowsiness, fatigue and impaired ...Background: Nasal symptoms frequently coexist in patients with chronic cough, and non-sedating H1-receptor antihistamines (nsH1RAs) are often prescribed for cough management in several countries. However, recommendations on the use of nsH1RAs vary among chronic cough guidelines. This study aimed to examine the …Jan 8, 2019 · Antihistamines are classified into non-sedating (<20%), less-sedating (20–50%), and sedating (≥50%) groups based on H 1 RO. Among the non-sedating group, fexofenadine and bilastine are classified into “non-brain-penetrating antihistamines” based on the H 1 RO. These two drugs have many common chemical properties. Oct 18, 2023 ... There are three less-sedating antihistamines, Claritin (loratadine), Zyrtec (cetirizine), Allegra (fexofenadine) and Xyzal (levocetirizine) ...Recent EAACI guidelines for management of CSU recommend second-generation non-sedating H1 antihistamines (sgAH 1 s) as initial treatment in children (weight-adjusted) as in adults, followed by increased doses (up to 4 times) if the standard dose is not effective. The efficacy and tolerability of fourfold updosing in adults are known, but there ...Conclusions These findings suggest that the mechanism of action of the rare proarrhythmic effects of the nonsedating antihistamines appears to be secondary to ...Non-sedating antihistamines are less toxic in overdose but may cause tachycardia, drowsiness, gastrointestinal disturbances and headache. Arrhythmias have occasionally been reported with sedating and non-sedating antihistamine overdose. Treatment of antihistamine overdose includes activated charcoal (when indicated) and …Symptomatic measures, such as increasing fluids, making sure children get enough rest and reducing the spread of the virus (including regular hand washing) should be practiced. For children requiring antihistamines for allergies, a non-sedating antihistamine such as loratadine or cetirizine is preferred. References. Medsafe. 2009.On all of these performance measures, loratadine has been shown to have effects comparable to placebo. In contrast, diphenhydramine, a common first-generation antihistamine, usually available without a doctor's prescription, has significant adverse effects on vigilance, divided attention, working memory and psychomotor performance.Introduction. Antihistamines are often used to treat the symptoms of …Second generation non-sedating antihistamines are recommended as first line therapy in the management of chronic spontaneous urticaria. If standard dose of second generation antihistamine is not found to be effective, higher dose (up to four fold) of non-sedating antihistamines is recommended.Background. Bilastine, a non-sedating H 1-antihistamine, is indicated to treat the symptoms of allergic disorders (e.g. rhinoconjunctivitis and urticaria) in adults and adolescents and, more recently, in children.Following its marketing approval, many questions regarding the ideal use of bilastine in various clinical practice situations have …non· se· dat· ing -si-ˈdāt-iŋ. variants or non-sedating. : not producing sedation. prescribed a nonsedating antihistamine. There are prescription antihistamines available that are totally nonsedating. Nancy Snyderman, Parenting. The first line treatment of urticaria is a daily non-sedating antihistamine at the age appropriate dose in adults and children. If there is inadequate response to treatment at the licensed dose the treatment options are: Switch to …Cardiac side effects. Side effects with geriatric use. Contraindications to …The non-sedating antihistamines include cetirizine, desloratadine, …Rupatadine (Rupafin) is a new non sedating antihistamine. All oral antihistamines except alimemazine (formerly trimep -razine) and hydroxyzine are licensed for the treatment of allergy such as hay fever and, except for ketotifen (Zaditen), for urticaria and/or pruritus. They are also widely used in over-the-counter medicines for symptomatic ...A multicentered trial compared the effects of the non-sedating antihistamine, loratadine, 5 mg plus pseudoephedrine 120 mg with a placebo on the signs and symptoms of the common cold. One hundred forty-two (142) subjects were treated with the loratadine/pseudoephedrine combination and 141 subjects w …Due to the higher risk of adverse effects associated with sedating antihistamines, it is preferred to choose a non-sedating antihistamine over a sedating antihistamine. Comparison of first-generation antihistamines and second-generation antihistamines This table compares first-generation antihistamines and second-generationIn most instances this nonsedating antihistamine was terfenadine (44.2%), followed by cetirizine (23.3%) and loratadine (16.3%). Table 1 Number of adverse drug reactions reported to LAREB until July 1999 categorized according to WHO-ART as system and organ class 1030 ‘heart rate and rhythm disorders’ sorted by type of arrhythmia.Children aged 6–11 years — 5 mg twice daily. Children aged 12 and over, and adults — 10 mg once daily. Loratadine is not licensed for use in children under 2 years of age. A suggested dose regimen is: Children aged 2–11 years and body weight up to 31 kg — 5 mg once a day. Children aged 2–11 years and body weight 31 kg and over ...Sep 20, 2023 · Cetirizine is classed as a non-drowsy (non-sedating) antihistamine, but it does make some people drowsy. In clinical trials, this side effect appeared to be related to the dose of cetirizine, with higher dosages increasing the risk of feeling drowsy. 1.9% of children aged 6 to 11 years experienced drowsiness with 5mg of cetirizine and 4.2% of children experienced drowsiness with 10mg of ... 46 Citations · Antihistamines for Allergic Rhinitis Treatment from the Viewpoint of Nonsedative Properties · Pharmacogenomics for the efficacy and side effects ....However, fexofenadine, rupatadine, and bilastine showed significantly higher efficacy than desloratadine or levocetirizine, and rupatadine had higher efficacy than fexofenadine. Figure 1. Efficacy of increased doses of nonsedating antihistamines in patients with chronic urticaria. A) According to mean pruritus score (MPS).Olopatadine, a non-sedating H1 antihistamine, decreases the nocturnal scratching without affecting sleep quality in atopic dermatitis Exp Dermatol. 2015 Mar;24(3):227-9. doi: 10.1111/exd.12630. Authors Keiichi ... Histamine H1 Antagonists, Non-Sedating / therapeutic use*Cardiac side effects. Side effects with geriatric use. Contraindications to …Therefore, it is not surprising that the second-generation antihistamines are less sedating than the first-generation antihistamines and that specific agents, ...Non-sedating antihistamines · acrivastine (eg Benadryl Allergy Relief) · cetirizine hydrochloride (eg Piriteze Allergy) · loratadine (eg Clarityn Allergy).Sep 29, 2023 · Loratadine (brand example: Claritin), an over-the-counter (OTC) non-sedating antihistamine, does not usually increase blood pressure when used alone as a single ingredient. Some OTC combination products do contain loratadine plus the decongestant pseudoephedrine (brand example: Claritin-D), which can raise your blood pressure. Oct 28, 2017 · Loratadine (Claritin) - The first of the prescription second generation antihistamines to go over the counter. It is also the least expensive. This is a great choice to try first for your allergy symptoms since it is almost completely non-drowsy and works for 24 hours. Cetirizine (Zyrtec) - Cetirizine was the second of the second generation ... The H 1 antihistamine drugs therefore act as inverse agonists. 1 . Loratadine is metabolised in the ... compared to children treated with non-sedating antihistamines and healthy children. 5 Sedating antihistamines have been found to be a cause of aviation accidents. 3 An audit of media reports found a number of car accidents attributed to ...
In most instances this nonsedating antihistamine was terfenadine (44.2%), followed by cetirizine (23.3%) and loratadine (16.3%). Table 1 Number of adverse drug reactions reported to LAREB until July 1999 categorized according to WHO-ART as system and organ class 1030 ‘heart rate and rhythm disorders’ sorted by type of arrhythmia.. Bethfit onlyfans
Antihistamines are not recommended for routine use in the management of atopic eczema. See the section on Management for more information. If there is severe itch or urticaria, consider prescribing a one-month trial of a non-sedating antihistamine, such as cetirizine, loratadine, or fexofenadine (an active metabolite of terfenadine), provided ...– Second and third-generation, or non-sedating antihistamines, are a more recent development and are used much more frequently as they usually, they don’t cause drowsiness and can be …Antihistamines. When histamine, a chemical created by your immune system, overreacts to an allergen such as pollen and pet dander, it can cause symptoms such as coughing, sneezing and watery eyes. Antihistamines are medications that help with allergies, and also with stomach problems, cold, anxiety and more. Antihistamines are a class of drugs ...Of the second-generation antihistamines, Allegra is the only one that is truly considered to be non-sedating. Certain antihistamines may also cause weight gain . According to the American Academy of Asthma, Allergy & Immunology, both older drugs like Periactan and newer ones like Allegra and Zyrtec are linked to an increased risk of obesity .Sep 21, 2023 · However, if you are taking an antihistamine to treat motion sickness, relieve anxiety or use as a sleep aid, a first-generation antihistamine may be recommended due to the sedating effects. There are many brands of antihistamines that are available over the counter (OTC), and finding the appropriate one for your needs can be confusing. A second-generation non-sedating antihistamine used to treat symptoms of allergic rhinoconjunctivitis and urticaria. GSK-1004723: Gsk1004723 has been investigated for the treatment of Allergic Rhinitis and Rhinitis, Allergic, Seasonal. Oxatomide: An antihistamine indicated in the treatment and prevention of allergic symptoms. DexchlorpheniramineObjective: Histamine H1 receptor (H1R) antagonists often have sedative side effects, which are caused by the blockade of the neural transmission of the histaminergic neurons. We examined the brain H1R occupancy (H1RO) and the subjective sleepiness of levocetirizine, a new second-generation antihistamine, comparing fexofenadine, another non …Antihistamines suppress the histamine-induced wheal response (swelling) and flare …Apr 4, 2000 · Introduction. Antihistamines are often used to treat the symptoms of allergies such as seasonal and perennial allergic rhinitis and urticaria. The first generation antihistamines have been associated with side effects, particularly sedation. 1 Second generation antihistamines are therefore favoured over the first generation drugs, not because of greatly improved efficacy but because they have ... Antihistamines are classified in two distinct groups: First generation (or sedating antihistamines) Second generation (or non-sedating antihistamines) First generation drugs offer sedative which result in their use for the alleviation of discomfort and disturbed patterns of behaviour, such as being unable to sleep through excessive itching ...Jun 1, 2000 ... However, risks of sedation may vary. Dose-response was not addressed by these investigators and could be very relevant. Nevertheless, for ...Olopatadine, a non-sedating H1 antihistamine, decreases the nocturnal scratching without affecting sleep quality in atopic dermatitis Exp Dermatol. 2015 Mar;24(3):227-9. doi: 10.1111/exd.12630. Authors Keiichi ... Histamine H1 Antagonists, Non-Sedating / therapeutic use*Antihistamines suppress the histamine-induced wheal response (swelling) and flare …Non-sedating antihistamines are associated with a lower incidence of drowsiness and sedation (because they penetrate the blood–brain barrier to a lesser extent than sedating antihistamines) . However, these adverse effects may still occur. Antihistamines are classified in two distinct groups: First generation (or sedating antihistamines) Second generation (or non-sedating antihistamines) First generation drugs offer sedative which result in their use for the alleviation of discomfort and disturbed patterns of behaviour, such as being unable to sleep through excessive itching ...Antihistamines. Antihistamines (histamine H 1 -receptor antagonists) are classified as sedating or non-sedating, according to their relative potential for CNS depression. Antihistamines differ in their duration of action, incidence of drowsiness, and antimuscarinic effects; the response to an antihistamine may vary from child to child. Non‐sedating antihistamine Compared to placebo Duration = not specified in abstract but assumed to be 2 days: Outcomes: Decrease in severity score for rhinorrhoea, nasal congestion and/or sneezing between the start of treatment and day 2 Decrease in weight of nasal secretions between the start treatment and day 2: Notes.