It's not only alright but recommended by a lot of Dr's. They want to cover it all! Only thing about Sudefed is that it may cause high blood presure or you may not should take if you do have rabroad. Something like that. I was prescribed Allegra and Astiline at my last appt. Can't see any improvement whatsoever with in whatever I have going on. This is in addition to acid meRAB too. I sometimes take a Bendryl at night even if I'm on allergy meRAB, which I usually am. Best thing for you to do is check with the pharmacy to be certain when adding meRAB.
Take care and hope you get some relief!
CharBerry