Cefprozil is a semi-synthetic broad-spectrum cephalosporin antibiotic.

Cefprozil is a cis and trans isomeric mixture (≥ 90% cis). The chemical name for the monohydrate is (6R, 7R)-7-[(R)-2-amino-2-(p-hydroxyphenyl)acetamido]-8-oxo-3-propenyl-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid monohydrate, and the structural formula is:

Cefprozil is a white to yellowish powder with a molecular formula for the monohydrate of C18H19N3O5S•H2O and a molecular weight of 407.44.

Each cefprozil tablet intended for oral administration contains cefprozil equivalent to 250 mg or 500 mg of anhydrous cefprozil. In addition each tablet contains the following inactive ingredients: hypromellose, magnesium stearate, methylcellulose, microcrystalline cellulose, polyethylene glycol 400, polysorbate 80, sodium starch glycolate and titanium dioxide. The 500 mg tablets also contain ferric oxide.

Cefprozil for oral suspension is intended for oral administration. Cefprozil for oral suspension contains cefprozil equivalent to 125 mg or 250 mg anhydrous cefprozil per 5 mL constituted suspension. In addition, the oral suspension contains the following inactive ingredients: aspartame, carboxymethylcellulose sodium, citric acid anhydrous, colloidal silicon dioxide, FD & C Yellow No. 6, glycine, microcrystalline cellulose and carboxymethylcellulose sodium, polysorbate 80, simethicone, sodium benzoate, sodium chloride, sucrose, and Tutti-Frutti flavor.

http://www.accessdata.fda.gov/drugsatfda_docs/label/2007/050664s024,050665s024lbl.pdf