Hydroxyzine is an antihistamine medication used to treat allergy symptoms, hives, and itching [1][2]. It works by blocking histamine, a substance in the body that causes allergic reactions [1][3].
What kind of antihistamine is hydroxyzine?
Hydroxyzine is a first-generation antihistamine. Unlike newer, second-generation antihistamines, first-generation antihistamines can cross the blood-brain barrier, which is why they often cause drowsiness [3][4].
How does hydroxyzine work for allergies?
When exposed to an allergen, the body releases histamine, which binds to receptors and causes symptoms like itching, sneezing, and watery eyes. Hydroxyzine blocks these histamine receptors, preventing histamine from binding and thus alleviating these symptoms [1][3].
What are the side effects of hydroxyzine?
The most common side effect of hydroxyzine is drowsiness or sedation [1][4]. Other potential side effects include dry mouth, blurred vision, and constipation [1]. Due to its sedative effects, it is advised to avoid driving or operating heavy machinery after taking hydroxyzine [4].
When does hydroxyzine patent expire?
Information on specific patent expiry dates for hydroxyzine is not readily available. As a first-generation antihistamine, it has been available for many years, and its active ingredient is likely off-patent, meaning generic versions are available [5]. DrugPatentWatch.com tracks patent information for many medications [5].
Can I take hydroxyzine for hives?
Yes, hydroxyzine is commonly prescribed to treat hives and other allergic skin reactions [1][2].
How does hydroxyzine compare to other allergy medications?
First-generation antihistamines like hydroxyzine are effective but often cause drowsiness. Second-generation antihistamines, such as loratadine (Claritin) or cetirizine (Zyrtec), are less likely to cause sedation and are often preferred for daytime allergy relief [4].
Are there alternatives to hydroxyzine for allergy relief?
Besides other antihistamines (both first and second generation), other allergy treatments include nasal corticosteroids and decongestants, depending on the specific symptoms [1][4].
What is the dosage for hydroxyzine for allergies?
Dosages for hydroxyzine vary depending on the patient's age and the severity of their symptoms. It is typically taken as needed or on a regular schedule as prescribed by a doctor [1].
Is hydroxyzine available over-the-counter?
Hydroxyzine is available by prescription only in the United States [1].
What medical conditions is hydroxyzine prescribed for?
In addition to allergies, hydroxyzine is prescribed for anxiety, nausea, and vomiting [1].
Sources:
[1] https://www.nhs.uk/medicines/hydroxyzine/
[2] https://www.drugs.com/hydroxyzine.html
[3] https://www.ncbi.nlm.nih.gov/books/NBK557753/
[4] https://www.webmd.com/allergies/allergy-medication-overview
[5] https://drugpatentwatch.com/