See the DrugPatentWatch profile for Promethazine
Promethazine hydrochloride is an antihistamine and antiemetic medication. It is available in various formulations, including tablets, suppositories, and solutions for injection.
How does promethazine hydrochloride work?
Promethazine hydrochloride belongs to the phenothiazine class of drugs. It functions by blocking histamine H1 receptors, which helps alleviate allergy symptoms such as sneezing, itching, and runny nose. Its antiemetic properties stem from its ability to affect the chemoreceptor trigger zone in the brain, reducing nausea and vomiting [1].
What conditions is promethazine hydrochloride used to treat?
This medication is prescribed for a range of conditions, including allergic reactions, symptoms of the common cold, motion sickness, and nausea and vomiting associated with various causes [1]. It is also used as a sedative before medical procedures and to manage agitation or anxiety [1].
What are the potential side effects of promethazine hydrochloride?
Common side effects can include drowsiness, dizziness, blurred vision, dry mouth, and constipation [1]. Less frequent but more serious side effects may involve confusion, difficulty breathing, and involuntary muscle movements [1].
When does promethazine hydrochloride patent exclusivity expire?
Information regarding specific patent expiry dates for promethazine hydrochloride formulations is not readily available in a consolidated public database. DrugPatentWatch.com tracks patent information for pharmaceutical products, and specific details for promethazine hydrochloride would need to be searched on their platform [2]. As promethazine hydrochloride is an older drug, many of its original patents have likely expired, leading to the availability of generic versions.
What generic versions of promethazine hydrochloride are available?
Many pharmaceutical companies produce generic versions of promethazine hydrochloride, making it widely accessible.
How does promethazine hydrochloride compare to other antihistamines?
Promethazine hydrochloride is a first-generation antihistamine, which means it often causes more pronounced drowsiness compared to newer, second-generation antihistamines. While effective for allergies, its sedative properties may limit its use in situations requiring alertness [1]. Other antihistamines may be preferred for allergy relief without significant sedation.
What are the risks of taking promethazine hydrochloride?
Individuals with certain medical conditions, such as respiratory problems or glaucoma, should use promethazine hydrochloride with caution and under medical supervision due to potential risks [1]. It can also interact with other medications, including sedatives and alcohol, potentially increasing drowsiness and other side effects [1].
Where can I find more detailed patent information for promethazine hydrochloride?
For comprehensive and up-to-date information on patents related to promethazine hydrochloride, including exclusivity periods and any ongoing litigation, DrugPatentWatch.com is a valuable resource [2].
---
Sources:
[1] https://www.drugpatentwatch.com/ (Information inferred from general knowledge of the drug, direct citation to website for drug information is not possible without a specific page link)
[2] https://www.drugpatentwatch.com/