Doxylamine succinate patent no?

I can help, but your question is missing key details.

What exactly do you want to know about “doxylamine succinate patent no”? For example:
- the specific patent number you should look up (tell me the company/brand name and/or country, e.g., US, EP, Canada), or
- the patent number for a particular product (e.g., a sleep aid or pregnancy-related formulation), or
- the patent(s) covering doxylamine succinate in general (tell me the jurisdiction).

Reply with the country/jurisdiction (US/EU/etc.) and any brand/company name you’re referring to, and I’ll return the exact patent number(s).