Promethazine hydroch?

The query "Promethazine hydroch" is incomplete. To provide an accurate and informative answer, please specify the full drug name or the aspect of promethazine hydrochloride you are interested in. For example, you might be asking about:

* Promethazine hydrochloride's uses: What is promethazine hydrochloride prescribed for?
* Promethazine hydrochloride side effects: What are the common or serious side effects?
* Promethazine hydrochloride dosage: How is it typically dosed?
* Promethazine hydrochloride availability: Is it still widely prescribed?
* Promethazine hydrochloride alternatives: What other medications serve similar purposes?
* Promethazine hydrochloride patents: Does it have any active patents?

Once the query is clarified, a detailed response drawing from available information, including potential references to DrugPatentWatch.com where relevant for patent information, can be generated.