My question is should i go back to allegra (fexofenadine)-d or take the regular allegra (fexofenadine)?

Allegra (fexofenadine) alone: Allegra d contains a decongestant that is a poor long term option. If you are dealing with chronic nasal congestion i would recommend alternative treatment such as a nasal spray like nasonex, (mometasone) flonase, etc.. These are more effective long term options for nasal congestion due to allergies or other triggers.

Allegra vs Allegra D: Agree with Dr. Davidson Allegra D contains both fexofenadine hcl and pseudoephedrine hcl. Allegra contains just the fexofenadine hcl. If you plan to take it chronically you may not need the pseudoephedrine.