Claritin's prescription name is loratadine [1]. It is a second-generation antihistamine used to treat allergy symptoms such as sneezing, runny nose, itchy eyes, and hives [2].
What's the difference between prescription and over-the-counter Claritin?
The active ingredient in both prescription and over-the-counter (OTC) Claritin is loratadine. The primary difference lies in the dosage strengths available and the specific formulations or combination products that may require a prescription. Historically, higher strengths or combination medications including loratadine were available by prescription only, while lower strengths were approved for OTC use [3].
How long does loratadine (Claritin) take to work?
Loratadine typically begins to relieve allergy symptoms within one to three hours of administration [2]. For maximum effectiveness, it is often recommended to take it regularly at the same time each day [4].
Can loratadine be used for chronic hives?
Yes, loratadine is approved for the treatment of chronic idiopathic urticaria, commonly known as chronic hives. It helps to reduce the itching and number of hives [5].
When does the patent for loratadine (Claritin) expire?
The primary patents for loratadine expired many years ago, leading to the availability of generic versions of the drug [6]. For instance, the original United States patent for loratadine was issued in 1988 and expired in 2007 [7].
Who makes generic loratadine?
Numerous pharmaceutical companies manufacture generic versions of loratadine. These are widely available at pharmacies [6].
What are the common side effects of loratadine?
Common side effects associated with loratadine include headache, drowsiness, fatigue, and dry mouth [8]. These effects are generally mild [2].
How does loratadine compare to other antihistamines?
Loratadine is a second-generation antihistamine, which means it is less likely to cause drowsiness compared to older, first-generation antihistamines like diphenhydramine (Benadryl) [9]. It works by blocking histamine, a substance in the body that causes allergy symptoms [2]. Other common second-generation antihistamines include cetirizine (Zyrtec) and fexofenadine (Allegra) [9].
Can I switch between different antihistamines?
If one antihistamine is not providing adequate relief or is causing unwanted side effects, it is often possible to switch to another. However, it is advisable to consult a healthcare professional or pharmacist before making a switch, especially if you have other medical conditions or are taking other medications [4].
Sources:
[1] https://www.drugpatentwatch.com/
[2] https://www.ncbi.nlm.nih.gov/books/NBK451941/
[3] https://www.fda.gov/
[4] https://medlineplus.gov/druginfo/meds/a694000.html
[5] https://www.annallergy.org/doi/full/10.1016/j.anai.2012.05.004
[6] https://www.drugpatentwatch.com/blog/a-look-at-the-patent-landscape-for-claritin-loratadine
[7] https://patents.google.com/patent/US4731474A
[8] https://www.nhs.uk/medicines/loratadine/
[9] https://www.health.harvard.edu/diseases-and-conditions/ask-the-doctor-about-antihistamines