WELLBUTRIN XL (bupropion hydrochloride), an antidepressant of the aminoketone class, is chemically unrelated to tricyclic, tetracyclic, selective serotonin re-uptake inhibitor, or other known antidepressant agents. Its structure closely resembles that of diethylpropion; it is related to phenylethylamines. It is designated as ()-1-(3chlorophenyl)-2-[(1,1-dimethylethyl)amino]-1-propanone hydrochloride. The molecular weight is 276.2. The molecular formula is C13H18ClNOHCl. Bupropion hydrochloride powder is white, crystalline, and highly soluble in water. It has a bitter taste and produces the sensation of local anesthesia on the oral mucosa. The structural formula is:

Budesonide, the active component of PULMICORT TURBUHALER (budesonide) 200 mcg, is a corticosteroid designated chemically as (RS)-11?, 16?, 17,21-Tetrahydroxypregna-1,4-diene-3,20-dione cyclic 16,17-acetal with butyraldehyde. Budesonide is provided as a mixture of two epimers (22R and 22S). The empirical formula of budesonide is C25H34O6 and its molecular weight is 430.5. Its structural formula is:

Betaxolol Hydrochloride Ophthalmic Solution contains betaxolol hydrochloride, a cardioselective beta-adrenergic receptor blocking agent, in a sterile isotonic solution. Betaxolol hydrochloride is a white, crystalline powder, soluble in water, with a molecular weight of 343.89. The chemical structure is presented below:

Each gram of Bactroban Ointment (mupirocin ointment), 2% contains 20 mg mupirocin in a bland water miscible ointment base (polyethylene glycol ointment, N.F.) consisting of polyethylene glycol 400 and polyethylene glycol 3350. Mupirocin is a naturally occurring antibiotic. The chemical name is (E)-(2S,3R,4R,5S) -5-[(2S,3S,4S,5S)-2,3-Epoxy-5-hydroxy-4-methylhexyl] tetrahydro-3,4-dihydroxy-?-methyl-2H-pyran-2-crotonic acid, ester with 9-hydroxynonanoic acid. The molecular formula of mupirocin is C26H44O9 and the molecular weight is 500.63. The chemical structure is:

CELESTONE Syrup, for oral administration, contains 0.6 mg betamethasone in each 5 mL. The inactive ingredients for CELESTONE Syrup (betamethasone) include: alcohol (less than 1%), citric acid, FD&C Red No. 40, FD&C Yellow No. 6, flavors, propylene glycol, sodium benzoate, sodium chloride, sorbitol, sugar, and water.

MYLERAN (busulfan) is a bifunctional alkylating agent. Busulfan is known chemically as 1,4-butanediol dimethanesulfonate and has the following structural formula:

Budesonide, the active ingredient of RHINOCORT AQUA (budesonide) Nasal Spray, is an anti-inflammatory synthetic corticosteroid.

BACTROBAN CREAM (mupirocin calcium cream), 2% contains the dihydrate crystalline calcium hemi-salt of the antibiotic mupirocin. Chemically, it is (olE,2S,3R,4R,5S)-5-[(2S,3S,4S,5S)-2,3-Epoxy-5-hydroxy-4-methylhexyl]tetrahydro-3,4-dihydroxy-p-methyl-2H-pyran-2-crotonic acid, ester with 9-hydroxynonanoic acid, calcium salt (2:1), dihydrate.

BLENOXANE (bleomycin sulfate for injection, USP) is a mixture of cytotoxic glycopeptide antibiotics isolated from a strain of Streptomyces verticillus. It is freely soluble in water.