I have been taking Lexapro every day, for many years
Can I take Suphedrine for a couple of days?
I want to take Suphedrine to relieve a problem with my right ear.
My ear is stuffy and I am not able to hear well.

Lexapro (escitalopram), an SSRI and Suphedrine, (pseudoephedrine).

While I can't advise in either direction here is a website that allows you to check drug interactions for yourself:

Drugs.com INTERACTION CHECKER

Another excellent resource for a quick answer is to call the dispensing pharmacy.