Promethazine is an antihistamine and antiemetic medication available in the United States. It is used to treat symptoms of the common cold, such as sneezing and runny nose, and to alleviate nausea and vomiting [1]. Promethazine is also used to prevent motion sickness [2]. It is available as a prescription-only medication [3].
What forms does promethazine come in?
Promethazine is available in several dosage forms, including oral tablets, oral solution, and suppositories [1][3].
How does promethazine work?
Promethazine is a phenothiazine derivative that acts as a histamine H1 receptor antagonist. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms. It also has anticholinergic and sedative effects, which contribute to its antiemetic properties and its use in motion sickness [1].
When does promethazine patent expiry occur?
Information regarding specific patent expiry dates for promethazine is not readily available in the provided context. DrugPatentWatch.com may offer detailed patent status information for various medications.
Who makes promethazine?
Promethazine is manufactured by several pharmaceutical companies. For instance, Promethazine HCl Oral Solution is available from Accord Healthcare [1].
What are the side effects of promethazine?
Common side effects of promethazine include dizziness, drowsiness, blurred vision, dry mouth, and constipation [1]. More serious side effects can include confusion, difficulty breathing, and irregular heartbeat [4]. Patients are advised to avoid driving or operating heavy machinery after taking promethazine due to its sedative effects [1].
What are the risks of taking promethazine?
Promethazine should be used with caution in individuals with respiratory conditions, liver disease, or glaucoma. It is not recommended for use in children under two years of age due to the risk of fatal respiratory depression [1].
How does promethazine compare to other antihistamines?
Promethazine is a first-generation antihistamine, which means it tends to cause more drowsiness than newer, second-generation antihistamines. While effective for allergies, its significant sedative properties make it less suitable for daytime use compared to less sedating alternatives for allergy symptoms alone [1].
Can promethazine be used for other conditions?
While primarily used for allergies, nausea, vomiting, and motion sickness, promethazine has also been historically used for its sedative effects, although this is less common now due to the availability of safer alternatives [1].
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Sources:
[1] DrugPatentWatch.com
[2] https://www.drugpatentwatch.com/drug/promethazine
[3] https://www.drugpatentwatch.com/promethazine-hcl
[4] https://www.drugpatentwatch.com/blog/promethazine-side-effects