The topical corticosteroids constitute a class of primarily synthetic steroids used as anti-inflammatory and antipruritic agents. The steroids in this class include triamcinolone acetonide. Triamcinolone acetonide is designated chemically as 9-fluoro-11?, 16?, 17, 21-tetrahydroxypregna-1, 4-diene-3, 20-dione cyclic 16, 17-acetal with acetone. The structural formula is:

The active ingredient of Intal Inhaler is cromolyn sodium, USP. It is an inhaled anti- inflammatory agent for the preventive management of asthma. Cromolyn sodium is disodium 5,5'-[(2-hydroxytrimethylene)dioxy]bis[4-oxo-4H-1-benzopyran-2-carboxylate]. The empirical formula is C23H14Na2O11; the molecular weight is 512.34. Cromolyn sodium is a water soluble, odorless, white, hydrated crystalline powder. It is tasteless at first, but leaves a slightly bitter aftertaste. The molecular structure of cromolyn sodium is:

DULERA 100 mcg/5 mcg and DULERA 200 mcg/5 mcg, are combinations of mometasone furoate and formoterol fumarate dihydrate for oral inhalation only.

The active component of ALVESCO (ciclesonide inhalation aerosol) 80 mcg Inhalation Aerosol, and ALVESCO 160 mcg Inhalation Aerosol is ciclesonide, a non-halogenated glucocorticoid having the chemical name pregna-1,4-diene-3,20-dione, 16,17-[[(R)-cyclohexylmethylene]bis(oxy)]-11-hydroxy-21-(2-methyl-1-oxopropoxy) ,(11?, 16?). The empirical formula is C32H44O7 and its molecular weight is 540.7. Its structural formula is as follows:

The active ingredient in ATROVENT HFA is ipratropium bromide (as the monohydrate). It is an anticholinergic bronchodilator chemically described as 8azoniabicyclo[3.2.1]octane, 3-(3-hydroxy-1-oxo-2-phenylpropoxy)-8-methyl-8-(1-methylethyl)-,bromide monohydrate, (3-endo, 8-syn)-: a synthetic quaternary ammonium compound, chemically related to atropine. The structural formula for ipratropium bromide is:

Nitroglycerin, an organic nitrate, is a vasodilator which has effects on both arteries and veins. The chemical name for nitroglycerin is 1,2,3-propanetriol trinitrate (C3H5N3O9). The compound has a molecular weight of 227.09. The chemical structure is:

The active component of VENTOLIN HFA is albuterol sulfate, USP, the racemic form of albuterol and a relatively selective beta2-adrenergic bronchodilator. Albuterol sulfate has the chemical name ?1-[(tert-butylamino)methyl]-4-hydroxy-m-xylene-?, ?' -diol sulfate (2:1)(salt) and the following chemical structure:

Tilade (nedocromil sodium) is an inhaled anti-inflammatory agent for the preventive management of asthma. Nedocromil sodium is a pyranoquinoline with the chemical name 4H-Pyrano[3,2-g]quinoline-2,8-dicarboxylic acid, 9-ethyl-6,9-dihydro-4,6-dioxo-10-propyl-, disodium salt, and it has a molecular weight of 415.3. The empirical formula is C19H15NNa2O7. Nedocromil sodium, a yellow powder, is soluble in water.

The active ingredient of PROAIR HFA (albuterol sulfate) Inhalation Aerosol is albuterol sulfate, a racemic salt, of albuterol. Albuterol sulfate has the chemical name ?1-[(tertbutylamino) methyl]-4-hydroxy-m-xylene-?,?'-diol sulfate (2:1) (salt), and has the following chemical structure: