According to drugs.com no interactions been found between Prednisione (an oral corticosteroid) and Sudafed PE Congestion (containing phenylephrine) nasal preparation; as this datum is about oral corticosteroid and and oral phenylephrine I assume that if this is correct than combining a nasal phenylephrine with a nasal steroid shouldn't be a problem, but I will try to further consolidate this thought.
It's possible to combine both an antihistamine (such as azelastine) and a steroid in a spray.
Why than should A1ARAs be different than antihistamines in that regard?
It may be extracted from this study that such a combination is possible, yet it wasn't effective for chronic rhinitis.
Is combining an Alpha1AdrenergicReceptorAgonist (A1ARA) nasal spray with a steroid nasal spray a plausible practice?