Qnasl information, interactions and side effects, Beclomethasone dipropionate USP, the active component of QNASL Nasal Aerosol, is an anti-inflammatory steroid having the chemical name 9-chloro-11β,17,21-trihydroxy-16βmethylpregna-1,4-diene-3,20-dione 17, 21-dipropionate and