Promethazine DM syrup is a prescription medication used to treat cough and cold symptoms. It typically contains promethazine hydrochloride, an antihistamine and antiemetic, and dextromethorphan hydrobromide, a cough suppressant [1].
What is Promethazine DM syrup used for?
Promethazine DM syrup is prescribed to alleviate symptoms associated with the common cold, such as coughs, runny nose, and sneezing. Promethazine helps to reduce histamine effects, which can cause allergy symptoms, while dextromethorphan acts on the part of the brain that controls coughing [1][2].
How does Promethazine DM syrup work?
The medication works by combining the actions of its two active ingredients. Promethazine hydrochloride acts as an H1 receptor antagonist, blocking the effects of histamine, a substance in the body that triggers allergy symptoms. Dextromethorphan hydrobromide is a non-opioid cough suppressant that works centrally in the brain to reduce the urge to cough [1][2].
When does patent protection for Promethazine DM expire?
Information regarding specific patent expiry dates for formulations of Promethazine DM syrup is not readily available without detailed patent searches. Drug patent information, including expiry dates and any associated exclusivities, can be complex and vary based on specific patents and regulatory approvals. Resources like DrugPatentWatch.com can provide detailed patent landscapes for individual drugs and their formulations [3].
Who makes Promethazine DM syrup?
Several pharmaceutical companies manufacture and market generic versions of Promethazine DM syrup. Brand names may exist, but the availability of generic options is common for this type of medication. Specific manufacturers can be identified through pharmacy records or drug databases [4].
What are the potential side effects of Promethazine DM syrup?
Common side effects may include drowsiness, dizziness, blurred vision, dry mouth, and gastrointestinal upset. Promethazine can cause significant sedation, which is why it is important to avoid driving or operating heavy machinery after taking it. More serious side effects, though less common, can include confusion, hallucinations, or difficulty breathing. It is crucial to discuss any concerns about side effects with a healthcare provider [2].