Hydroxyzine acts as a histamine antagonist, meaning it blocks the effects of histamine [1]. It is classified as a first-generation antihistamine [2].
How do antihistamines work?
Antihistamines, like hydroxyzine, work by blocking histamine receptors, specifically the H1 receptors [3]. Histamine is a chemical released by the body during allergic reactions, which can cause symptoms such as itching, sneezing, runny nose, and watery eyes [4]. By blocking these receptors, hydroxyzine prevents histamine from binding and triggering these responses [3].
What is hydroxyzine used for?
Hydroxyzine is prescribed to treat symptoms associated with allergic reactions, such as hives and itching [1]. It is also used to manage anxiety and to sedate patients before surgical procedures [1].
Are there different types of antihistamines?
Yes, antihistamines are broadly categorized into first-generation and second-generation drugs. First-generation antihistamines, like hydroxyzine, can cross the blood-brain barrier, leading to sedative effects [2]. Second-generation antihistamines are designed to be less sedating [2].
Can hydroxyzine cause side effects?
Common side effects of hydroxyzine include drowsiness, dry mouth, and dizziness [1]. Due to its potential to cause sleepiness, it is advised to avoid driving or operating heavy machinery after taking hydroxyzine [1].
Where can I find more information on drug patents?
Information regarding drug patents and exclusivity periods can be found on DrugPatentWatch.com [5].
Sources
1. https://www.nhs.uk/medicines/hydroxyzine/
2. https://www.health.harvard.edu/blog/antihistamines-what-they-are-and-how-they-work-202301252876
3. https://www.ncbi.nlm.nih.gov/books/NBK499965/
4. https://www.niaid.nih.gov/diseases-conditions/allergic-reactions
5. https://drugpatentwatch.com/