Each nasal spray works differently, and determining the best product for each person depends on what symptoms they have and what is required from the medicine, reports Everyday Health. However, long-time use of over-the-counter decongestants is discouraged to treat allergies because they may become habit forming.
Many over-the-counter nasal sprays such as NasalCrom stop inflammation and other allergy symptoms, notes Everyday Health. Saline nasal sprays have no decongestants but soften mucus for clear passageways. Astelin nasal spray stops sinus congestion and postnasal drip. Prescription nasal sprays such as Flonase, Nasarel and Omnaris prevent sneezing and runny nose. Decongestant products may raise blood pressure and cause nervousness, warns WebMD.