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ERYTHROCIN STEARATE Filmtab tablets (erythromycin stearate tablets, USP) are an antibacterial product containing the stearate salt of erythromycin in a unique film coating.

Erythromycin is produced by a strain of Saccharopolyspora erythraea (formerly Streptomyces erythraeus) and belongs to the macrolide group of antibiotics. It is basic and readily forms salts with acids. Erythromycin is a white to off-white powder, slightly soluble in water, and soluble in alcohol, chloroform, and ether. Erythromycin stearate is known chemically as erythromycin octadecanoate. The molecular formula of erythromycin stearate is C₃₇H₆₇NO₁₃•C₁₈H₃₆O₂, and the molecular weight is 1018.43. The structural formula is:

Inactive Ingredients

250 mg tablet: Cellulosic polymers, corn starch, D&C Red No. 7, polacrilin potassium, polyethylene glycol, povidone, propylene glycol, sodium carboxymethylcellulose, sodium citrate, sorbic acid, sorbitan monooleate and titanium dioxide. 500 mg tablet: Cellulosic polymers, corn starch, FD&C Red No. 3, magnesium hydroxide, polacrilin potassium, povidone, propylene glycol, sorbitan monooleate, titanium dioxide and vanillin.

Last reviewed on RxList: 9/10/2008
This monograph has been modified to include the generic and brand name in many instances.