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The elimination half-life of cetirizine ranges from 6.5 to 10 hours in healthy adults, with a mean across studies of approximately 8.3 hours. [3] [2] The elimination half-life of cetirizine is increased in the elderly (to 12 hours), in hepatic impairment (to 14 hours), and in renal impairment (to 20 hours). [2]
Levocetirizine is an antihistamine. It acts as an inverse agonist that decreases activity at histamine H1 receptors. This in turn prevents the release of other allergy chemicals and increases the blood supply to the area, providing relief from the typical symptoms of hay fever.
The most common adverse effects noted for second-generation agents include drowsiness, fatigue, headache, nausea and dry mouth. [4] Continuous and/or cumulative use of anticholinergic medications, including first-generation antihistamines, is associated with higher risk for cognitive decline and dementia in older people. [8] [9]
8. Remember skin care. Skin infections are one of the most common infections in the elderly and a primary reason proper senior hygiene is so important. Skin becomes more sensitive with age and a ...
It is able to cross the blood–brain barrier and can produce effects in the central nervous system (e.g., headaches, dizziness, somnolence). [2] The volume of distribution of cimetidine is 0.8 L/kg in adults and 1.2 to 2.1 L/kg in children. [6] Its plasma protein binding is 13 to 25% and is said to be without pharmacological significance.
Common side effects of the drug include drowsiness, dizziness, dry mouth and throat, confusion, and blurred vision. [2] In the United States and Canada, the active ingredient is diphenhydramine. In the United Kingdom, the active ingredients of Benadryl are the second-generation antihistamines acrivastine [3] or cetirizine. [4]
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