Good Morning and Welcome to HealingWell.
I am sorry about your husband. It appears that your physician is switching the Cymbalta for the Welbutrin. 300 mg per day is in the therapeutic dose range and is not an SSRI med.
Cymbalta is an SRNI med so they are 2 different types of antidepressants. You may want to ask his Doctor why the switch and what kinds of side effects to look for.
Stick with us and we will be here to support you.
Again a warm welcome