Cefadroxil, USP (hemihydrate) is a semisynthetic cephalosporin antibiotic intended for oral administration. It is white to off-white crystalline powder. It is slightly soluble in water and it is acid-stable. It is chemically designated as 5-Thia-1-azabicyclo [4.2.0] oct-2-ene-2-carboxylic acid, 7-[[amino (4-hydroxyphenyl) acetyl] amino]-3- methyl-8-oxo-, hemihydrate, [6R-[6α, 7β (R*)]]-. It has the formula C₁₆H₁₇N₃O₅S•½ H₂O and the molecular weight of 372.39. It has the following structural formula:

Each film coated tablet for oral administration contains Cefadroxil hemihydrate equivalent to 1 gram cefadroxil. In addition, each tablet contains the following inactive ingredients: croscarmellose sodium, hypromellose, magnesium stearate, microcrystalline cellulose, monosodium citrate, polyethylene glycol, talc and titanium dioxide.

Each capsule for oral administration contains Cefadroxil hemihydrate equivalent to 500 mg cefadroxil. In addition, each capsule contains the following inactive ingredients: magnesium stearate and pregelatinized starch.

The capsule shell also contains D&C yellow no. 10, FD&C blue no. 1, FD&C red no. 40, gelatin and titanium dioxide.

The imprinting ink also contains D&C yellow no. 10 aluminum lake, FD&C blue no. 1 aluminum lake, FD&C blue no. 2 aluminum lake, FD&C red no. 40 aluminum lake, pharmaceutical glaze, propylene glycol and synthetic black iron oxide.

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