See the DrugPatentWatch profile for promethazine
What is promethazine DM?
Promethazine DM is a prescription medicine that combines two drugs: promethazine and dextromethorphan (DM). It’s used to treat cough, especially coughs associated with a cold or other upper respiratory illness. [1]
What does each ingredient do?
Promethazine is an antihistamine. It can help reduce allergy-related symptoms and can also make people feel drowsy.
Dextromethorphan is a cough suppressant. It works by affecting the cough reflex. [1]
What is it used for?
Promethazine DM is commonly prescribed for cough symptoms, including cough related to colds and similar respiratory conditions. [1]
What side effects do people report?
Because promethazine is an antihistamine, common effects can include sleepiness or sedation. Dextromethorphan can also cause side effects in some people. Side effects vary by dose and individual health conditions. [1]
Is it the same as cough syrup you can buy over the counter?
Some cough syrups are over-the-counter and may contain different ingredients. Promethazine DM is typically prescription-only because promethazine-containing products can cause sedation and have important safety considerations. [1]
Are there safety concerns or who should avoid it?
Promethazine DM can cause drowsiness, so it’s important to avoid alcohol and be cautious with other sedating medicines. It may not be appropriate for everyone (for example, certain children and people with specific medical conditions). Clinicians usually provide specific guidance based on age, other medications, and health history. [1]
Sources
[1] https://www.drugs.com/promethazine_dm.html