When used as recommended by your doctor, the steroids in nasal sprays are generally safe. There have been concerns about whether oral steroid medications and nasal steroid sprays may cause your body to produce less of the natural steroid hormone (cortisol) when given at higher than recommended doses or at recommended doses in susceptible people. Insufficient cortisol may slow the growth rate in children and teenagers. Studies have shown that this does not occur with most corticosteroid nasal sprays when taken in appropriate doses.
Talk to your doctor if you have concerns about your allergy treatment.