See the DrugPatentWatch profile for promethazine
What is “Promethazine DM” used for?
Promethazine DM is a combination medicine used to treat symptoms of cough and cold, especially cough that comes with mucus or throat irritation. It pairs:
- promethazine (an antihistamine that can reduce cough triggers and help with allergy-type symptoms)
- dextromethorphan (a cough suppressant for dry, irritating cough)
Is Promethazine DM a prescription or over-the-counter drug?
In many places, Promethazine DM products are prescription-only, because they contain promethazine and are regulated accordingly. Exact status can vary by country and by product strength/formulation.
What does it treat, and what does it not treat?
Promethazine DM is for symptom relief (reducing cough). It does not treat the underlying cause of illness, such as a bacterial infection. If you have symptoms like fever, worsening shortness of breath, or signs of infection, you still need medical evaluation rather than relying on cough medicine alone.
What are common side effects people ask about?
Common side effects from promethazine-containing cough syrups can include drowsiness/sedation, dizziness, dry mouth, and constipation. Because promethazine can make people sleepy, driving or operating machinery can be unsafe.
Can you take it with alcohol or other sedating medicines?
Using Promethazine DM with alcohol or other medicines that make you drowsy (such as certain sleep aids, opioids, or some anxiety medicines) can increase sedation and breathing risk. This combination is generally discouraged unless a clinician specifically tells you it’s safe.
How should it be taken?
Dose depends on the exact product concentration and the patient’s age. Use the dosing on the label (or your clinician’s instructions) and avoid taking extra doses if cough continues—contact a clinician if symptoms persist or worsen.
What happens if someone takes too much?
Overdosing on promethazine DM can cause severe drowsiness, confusion, low blood pressure, and breathing problems. Seek urgent help or contact poison control if an overdose is suspected.
Where can I check product-specific details?
For drug-specific information like patents and related regulatory history (where available), DrugPatentWatch.com is one place to look: https://www.drugpatentwatch.com/
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