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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] It is taken orally.
Side effects. Adverse drug reactions are most commonly associated with the first-generation H 1-antihistamines. This is due to their relative lack of selectivity for the H 1-receptor and their ability to cross the blood–brain barrier. The most common adverse effect is sedation; this "side-effect" is utilized in many OTC sleeping-aid preparations.
A Clarinase Repetab tablet contains 5 mg loratadine in the tablet coating and 120 mg pseudoephedrine sulfate equally distributed between the tablet coating and the barrier-coated core. The two active components in the coating are quickly liberated; release of pseudoephedrine in the core is delayed for several hours.
Antihistamines are drugs which treat allergic rhinitis, common cold, influenza, and other allergies. Typically, people take antihistamines as an inexpensive, generic (not patented) drug that can be bought without a prescription and provides relief from nasal congestion, sneezing, or hives caused by pollen, dust mites, or animal allergy with few side effects.
The drug can be in the form of tablets, capsules or a syrup. Adverse effects. Commonly reported side effects of cetirizine include headache, dry mouth, drowsiness, and fatigue, while more serious, but rare, adverse effects reported include tachycardia and edema. Pruritus after discontinuation of cetirizine
Desloratadine is used to treat allergic rhinitis, nasal congestion and chronic idiopathic urticaria ( hives ). [8] It is the major metabolite of loratadine and the two drugs are similar in safety and effectiveness. [8] Desloratadine is available in many dosage forms and under many brand names worldwide. [9]
Ball-and-stick model of cimetidine, the prototypical H 2 receptor antagonist. H2 antagonists, sometimes referred to as H2RAs [1] and also called H2 blockers, are a class of medications that block the action of histamine at the histamine H 2 receptors of the parietal cells in the stomach. This decreases the production of stomach acid.
3. receptor antagonist. An H3 receptor antagonist is a type of antihistaminic drug used to block the action of histamine at H 3 receptors . Unlike the H 1 and H 2 receptors which have primarily peripheral actions, but cause sedation if they are blocked in the brain, H 3 receptors are primarily found in the brain and are inhibitory autoreceptors ...
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