Advair is a combination "controller" medicine for long-term treatment to prevent or decrease the symptoms of asthma and chronic lung diseases such as emphysema, bronchitis, or COPD.
Allegra-D is an antihistamine and decongestant combination used to relieve congestion, sneezing, and watery eyes due to colds, flu, or hay fever. It may also be used for other conditions as determined by your doctor.
Nasacort is a corticosteroid used to treat the symptoms of seasonal and perennial allergic rhinitis (hay fever). It may also be used to treat other conditions as determined by your doctor.