Can i take an alavert or benadryl (diphenhydramine) with flonase?

Both to help more: Nasal steroid such as Flonase is the front line treatment for allergic rhinitis, but at time people do need more than a spray--adding an antihistamine such as alavert, zyrtec, benadryl, (diphenhydramine) Allegra is quite common--they do not interact and in fact both work to help your allergies. Of course, use the smallest effective dose when needed. Good luck.