Diphenhydramine is available under various brand names, with Benadryl being one of the most well-known. Other common brand names include Unisom SleepTabs and ZzzQuil [1]. These medications are primarily used to treat allergy symptoms, insomnia, and motion sickness [2].
What ingredients are in Benadryl products?
Benadryl products often contain diphenhydramine hydrochloride as the active ingredient. Some formulations, like certain ZzzQuil products, may use a different active ingredient, such as diphenhydramine citrate, which also acts as an antihistamine [1].
How does diphenhydramine work?
Diphenhydramine is an antihistamine that works by blocking the effects of histamine, a substance in the body that causes allergic symptoms [2]. It also has sedative effects, which is why it is used to treat insomnia [3].
When does the patent for diphenhydramine expire?
Diphenhydramine is a generic medication that has been available for many years. As such, there are no active patents that would prevent generic versions from being produced or sold. DrugPatentWatch.com tracks patent expirations for many drugs, and for established medications like diphenhydramine, the original patents have long since expired [4].
What are the side effects of diphenhydramine?
Common side effects of diphenhydramine can include drowsiness, dizziness, blurred vision, and dry mouth [2]. It is important to use caution when driving or operating machinery after taking diphenhydramine due to its sedative properties [5].
Are there alternatives to diphenhydramine for allergies?
For allergy relief, there are several alternative medications available. These include other antihistamines, such as loratadine (Claritin) and cetirizine (Zyrtec), which are less likely to cause drowsiness. Nasal corticosteroids are also an effective option for managing nasal allergy symptoms [6].
Can children take diphenhydramine?
Diphenhydramine can be used in children, but dosage and administration should be carefully considered based on the child's age and weight. It is advisable to consult a pediatrician or pharmacist before giving diphenhydramine to children [5].
Is diphenhydramine used for anything other than allergies and sleep?
Beyond allergies and insomnia, diphenhydramine is also used to treat symptoms of the common cold, such as sneezing and runny nose, and to prevent nausea, vomiting, and dizziness associated with motion sickness [2].
Sources:
[1] https://www.drugpatentwatch.com/
[2] https://www.mayoclinic.org/drugs-supplements/diphenhydramine-oral-route-rectal-route-topical-route/description/drg-20072177
[3] https://www.webmd.com/drugs/2/777/diphenhydramine-oral/details
[4] https://www.drugpatentwatch.com/
[5] https://www.nhs.uk/medicines/diphenhydramine/
[6] https://www.aaaai.org/conditions-and-treatments/allergies