Can you take Sudafed and Benadryl at the same time?

Which Sudafed?

Sudafed PE Congestion
Congestion
PE Sinus and Allergy
Non Drying Sinus

And the list goes on, be more specific as to which Sudafed it is, to properly run an interaction check.
There are more than 10 varieties of Sudafed.

Or you can check for yourself, click on the link and follow the instructions:

https://www.drugs.com/drug_interactions.html