See the DrugPatentWatch profile for promethazine
Quagen Pharma's Promethazine Hydrochloride, an antihistamine and antiemetic, is available in several forms, including oral syrup, oral solution, and injectable solution [1][2].
What is Promethazine Hydrochloride Used For?
Promethazine hydrochloride is used to treat symptoms of the common cold and allergies, such as sneezing, runny nose, itchy throat, and watery eyes [1]. It is also prescribed to prevent and control nausea and vomiting caused by motion sickness or certain medical treatments like surgery or chemotherapy [1][3]. Additionally, it can be used to relieve pain and anxiety before or after surgery [1].
How Does Promethazine Hydrochloride Work?
As a phenothiazine, promethazine hydrochloride works by blocking the action of histamine, a substance in the body that causes allergic symptoms [1]. It also affects dopamine receptors in the brain, which helps to reduce nausea and vomiting [1][3].
When Does Patent Exclusivity for Promethazine Hydrochloride Expire?
Promethazine hydrochloride is an older drug, and its patents have long since expired. This means that generic versions have been available for many years from various manufacturers [4].
Who Manufactures Promethazine Hydrochloride?
Multiple pharmaceutical companies produce promethazine hydrochloride. Quagen Pharma is one such manufacturer, offering it in different formulations. Other companies also make generic versions of this medication [1][2][4].
What Are the Potential Side Effects of Promethazine Hydrochloride?
Common side effects can include drowsiness, dizziness, blurred vision, dry mouth, constipation, and ringing in the ears [1]. More serious side effects, though less common, can involve confusion, severe dizziness, tremors, jerky movements, irregular heartbeat, and difficulty breathing [1]. It is important to avoid activities requiring alertness, such as driving, until the effects of the medication are known [1].
Are There Alternatives to Promethazine Hydrochloride?
For allergy symptoms, other antihistamines like loratadine or cetirizine are available. For nausea and vomiting, alternatives depend on the cause and may include other antiemetics such as ondansetron or scopolamine for motion sickness [3]. Always consult a healthcare professional for advice on alternative treatments.