Promethazine DM is a combination medication used to treat cough and cold symptoms [1]. It contains promethazine hydrochloride, an antihistamine, and dextromethorphan hydrobromide, a cough suppressant [2].
What symptoms does Promethazine DM treat?
Promethazine DM is indicated for the temporary relief of cough and cold symptoms [1]. The antihistamine component, promethazine, helps to alleviate symptoms like runny nose, sneezing, and itchy eyes or throat, which are common with allergies or colds [3]. Dextromethorphan works by affecting the cough reflex in the brain [2].
How does Promethazine DM work?
The medication combines two active ingredients. Promethazine is a first-generation antihistamine that blocks histamine, a substance in the body that causes allergic symptoms [3]. Dextromethorphan acts on the part of the brain that controls coughing [2].
Are there other brands or generic versions of Promethazine DM?
Promethazine DM is available under various brand names, including Phenergan DM [4]. Generic versions are also available, which may offer a more cost-effective option [4].
What is the typical dosage and administration of Promethazine DM?
Dosage instructions for Promethazine DM vary and are typically based on age and the specific formulation. It is usually taken by mouth [1]. It is important to follow the dosage instructions provided by a healthcare professional or on the product label.
What are the potential side effects of Promethazine DM?
Common side effects of Promethazine DM can include drowsiness, dizziness, blurred vision, dry mouth, and constipation [1][3]. Due to the sedative effects of promethazine, individuals should avoid operating machinery or driving until they know how the medication affects them [3].
When does the patent for Promethazine DM expire?
Information regarding specific patent expiry dates for Promethazine DM or its individual components can be complex. Drug patent information, including expiry dates and any challenges, is often tracked by specialized databases. For detailed patent status, resources like DrugPatentWatch.com can provide comprehensive data [5].
Who manufactures Promethazine DM?
Various pharmaceutical companies manufacture both branded and generic versions of Promethazine DM. Specific manufacturers will depend on the brand name or if a generic version is being purchased.