what are 2nd generation antihistamines?
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Antihistamines, 2nd Generation These include brompheniramine, chlorpheniramine (Chlor-Trimeton), and diphenhydramine (Benadryl). Some 2nd generation antihistamines, such as fexofenadine (Allegra), loratadine (Claritin), and cetirizine (Zyrtec) are now available OTC without a prescription.
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Allegra (fexofenadine) and Zyrtec (cetirizine) are both antihistamines that are available OTC in brand-name and generic form. Both are available in a variety of formats for dosing preference, such as tablet and liquid form. Allegra and Zyrtec are both used in adults and children.
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Are Benadryl and Allegra the Same Thing? Benadryl (diphenhydramine) and Allegra (fexofenadine hydrochloride) are antihistamines used to treat allergic symptoms of seasonal allergic rhinitis (sneezing, runny nose, itchy or watery eyes), and hives.
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Third-generation antihistamines are defined as being metabolites or enantiomers of previously available drugs and can therefore lead to an increase in efficacy and/or safety. In Canada these include: fexofenadine and desloratidine [4].
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First-generation antihistamines include diphenhydramine (Benadryl), carbinoxamine (Clistin), clemastine (Tavist), chlorpheniramine (Chlor-Trimeton), and brompheniramine (Dimetane).
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Antihistamines. Benadryl (diphenhydramine), Zyrtec (cetirizine), and Claritin (loratadine) are commonly used antihistamines that relieve allergy symptoms or counteract allergic reactions. Antihistamines are usually safe but make some dogs drowsy and others hyperactive.
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Two popular FDA-approved medications are Xyzal (levocetirizine dihydrochloride) and Zyrtec (cetirizine hydrochloride). Both medications are antihistamines, also called H1 blockers. They block the action of histamine, thereby relieving allergy symptoms.
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Benadryl: The trade name for the antihistamine diphenhydramine, Benadryl is an anti-allergy drug available over-the-counter. Dimenhydrinate: An over-the-counter antihistamine, marketed under the commercial name Dramamine, which is used to treat motion sickness.
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Zyrtec-D (cetirizine with pseudoephedrine) is an antihistamine combined with the same active ingredient as Sudafed. It is used to treat seasonal allergies and relieve nasal congestion and sinus pressure. It is sold over the counter, and a generic version is also available.
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Antihistamines are given to treat allergy symptoms, such as sneezing, runny nose, itching, or hives, and include drugs ending in -ine, such as diphenhydramine, loratadine, and brompheniramine.
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But it is important to choose wisely, as some allergy medications can harm brain health and increase dementia risk. Diphenhydramine (e.g., Benadryl®) is a first-generation antihistamine medication [1].
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H2 antagonists are a type of antihistamine, although in common use the term "antihistamine" is often reserved for H1 antagonists, which relieve allergic reactions.
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Allegra-D (fexofenadine / pseudoephedrine) is a combination allergy medicine that's useful if you have congestion and runny nose. The antihistamine (Cetirizine) in Zyrtec D (Cetirizine / Pseudoephedrine) causes less drowsiness than other medications like Benadryl.
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Oral antihistamines may relieve the itching. Nondrowsy oral antihistamines include fexofenadine (Allegra) and loratadine (Claritin). Antihistamines like diphenhydramine (Benadryl) or chlorpheniramine (Chlor-Trimeton) are less expensive but can make you feel sleepy.
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For example, while Claritin is effective for treating hay fever and hives, other antihistamines, such as Zyrtec and Allegra, work better and faster and last longer. Zyrtec and Allegra work quickly for the treatment of allergic rhinitis and hives, typically within less than an hour.
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Antihistamine sprays relieve congestion, itchy and runny nose, and sneezing. They are available by prescription and include azelastine (Astelin, Astepro) and olopatadine (Patanase). They usually cause less drowsiness than antihistamine pills, but they still may make some people sleepy.
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Examples of second-generation cephalosporins include: cefaclor (Ceclor) cefuroxime (Ceftin) cefprozil (Cefzil)