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. The base, the stearate salt, and the esters are poorly soluble in water. Erythromycin ethylsuccinate is an ester of erythromycin suitable for oral administration. Erythromycin ethylsuccinate is known chemically as erythromycin 2'-(ethyl succinate). The molecular formula is C43H75NO16 and the molecular weight is 862.06. The structural formula is:

DRISDOL brand of ergocalciferol capsules, USP, is a synthetic calcium regulator for oral administration.

EXELDERM (sulconazole nitrate) SOLUTION, 1.0% is a broad-spectrum antifungal agent intended for topical application. Sulconazole nitrate, the active ingredient in EXELDERM (sulconazole) SOLUTION, is an imidazole derivative with antifungal and antiyeast activity. Its chemical name is (▒)-1-[2,4-Dichloro-? [( p-chlorobenzyl)thio]phenethyl] imidazole mononitrate and it has the following chemical structure:

Zortress (everolimus) is a macrolide immunosuppressant.

Duranest (Etidocaine HCl) Injections are sterile aqueous solutions that contain a local anesthetic agent and are administered parenterally by injection. See INDICATIONS AND USAGE for specific uses. The specific quantitative composition of each available solution is shown in Table 1.

ETHAMOLIN« (Ethanolamine Oleate) Injection is a mild sclerosing agent. Chemically it is C17H33COOHĽNH20H2CH2OH.

EXPAREL is a sterile, non-pyrogenic white to off-white preservative-free aqueous suspension of multivesicular liposomes (DepoFoam« drug delivery system) containing bupivacaine. Bupivacaine is present at a concentration of 13.3 mg/mL. After injection of EXPAREL into soft tissue, bupivacaine is released from the multivesicular liposomes over a period of time.

Ethacrynic acid is an unsaturated ketone derivative of an aryloxyacetic acid. It is designated chemically as [2,3-dichloro-4-(2-methylene-1-oxobutyl)phenoxy] acetic acid, and has a molecular weight of 303.14. Ethacrynic acid is a white, or practically white, crystalline powder, very slightly soluble in water, but soluble in most organic solvents such as alcohols, chloroform, and benzene.

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

Climara Pro« (Estradiol/Levonorgestrel Transdermal System) is an adhesive-based matrix transdermal patch designed to release both estradiol and levonorgestrel, a progestational agent, continuously upon application to intact skin.