The active component of FLOVENT DISKUS (fluticasone propionate) 50 mcg, FLOVENT DISKUS 100 mcg, and FLOVENT DISKUS 250 mcg is fluticasone propionate, a corticosteroid having the chemical name S-(fluoromethyl) 6?,9-difluoro-11?,17-dihydroxy-16?-methyl-3-oxoandrosta-1,4-diene-17?-carbothioate, 17-propionate and the following chemical structure:

ADVAIR DISKUS 100/50 (fluticasone propionate) , ADVAIR DISKUS (fluticasone propionate) 250/50, and ADVAIR DISKUS 500/50 are combinations of fluticasone propionate and salmeterol xinafoate.

SEREVENT DISKUS contains salmeterol xinafoate as the racemic form of the 1-hydroxy-2-naphthoic acid salt of salmeterol. The active component of the formulation is salmeterol base, a selective beta2-adrenergic bronchodilator. The chemical name of salmeterol xinafoate is 4-hydroxy-?1-[[[6-(4-phenylbutoxy)hexyl]amino]methyl]-l,3-benzenedimethanol, l-hydroxy-2-naphthalenecarboxylate. Salmeterol xinafoate has the following chemical structure: