Will promethazine help me sleep? Yes. If you take it for insomnia or take it at bedtime, promethazine will help you sleep.
If you take it during the day for other conditions, such as allergies, it might make you feel sleepy during the day as well.
Promethazine is an antihistamine sometimes used as a sleeping pill. It is also known by the trade names Phenergan and Sominex.
It’s available to buy without a prescription from a doctor. It is an ingredient in some over-the-counter cold and flu medicines, such as Night Nurse.
You can find detailed information about this drug in the official Patient Information Leaflet (PIL). This includes information on what the medication is for, how to take it, possible side effects and safety information.
This leaflet should come with your medication, usually inside the box. Or you can download a PDF version of the PIL for your medication:
Some drugs come in different forms, such as tablets or liquid. There may be a separate PIL for each form of the drug, as well as for different doses. You should look at the PIL for the form and dose you have been prescribed.
You can also search these websites for your specific drug to find further information and PILs: