Doxercalciferol, the active ingredient in Hectorol® (doxercalciferol liquid filled capsule) , is a synthetic vitamin D2 analog that undergoes metabolic activation in vivo to form l?,25-dihydroxyvitamin D2 (l?,25-(OH)2D2), a naturally occurring, biologically active form of vitamin D2. Hectorol (doxercalciferol liquid filled capsule) is available as soft gelatin capsules containing 0.5 mcg, 1 mcg or 2.5 mcg doxercalciferol. Each capsule also contains fractionated triglyceride of coconut oil, ethanol, and butylated hydroxyanisole (BHA). The capsule shells contain gelatin, glycerin and titanium dioxide. In addition, the 0.5 mcg capsule shells contain yellow iron oxide and FD&C Red No. 40, the 1 mcg capsule shells contain FD&C Yellow No. 6, and the 2.5 mcg capsule shells contain yellow iron oxide.

Theophylline is structurally classified as a methylxanthine. It occurs as a white, odorless, crystalline powder with a bitter taste. Anhydrous theophylline has the chemical name 1H-Purine-2,6-dione, 3,7-dihydro-1,3-dimethyl-, and is represented by the following structural formula:

Dilacor XR® (diltiazem hydrochloride) is a calcium ion influx inhibitor (slow channel blocker or calcium antagonist). Chemically, diltiazem hydrochloride is 1,5-Benzothiazepin-4(5H)one, 3-(acetyloxy)-5-[2-(dimethylamino)ethyl]-2,3-dihydro-2-(4-methoxyphenyl)-, monohydrochloride, (+)-cis-. Its molecular formula is C22H26N2O4S•HCl and its molecular weight is 450.98. Its structural formula is as follows:

MICROZIDE® (hydrochlorothiazide, USP 12.5 mg) is the 3,4-dihydro derivative of chlorothiazide. Its chemical name is 6-chloro-3,4-dihydro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide. Its empirical formula is C7H8CIN304S2; its molecular weight is 297.74; and its structural formula is:

Fioricet with Codeine (Butalbital, Acetaminophen, Caffeine, and Codeine Phosphate) is supplied in capsule form for oral administration.

SANCTURA XR® is an extended-release formulation of trospium chloride, a quaternary ammonium compound with the chemical name of Spiro [8-azoniabicyclo[3.2.1]octane-8,1'-pyrrolidinium], 3-[(hydroxydiphenylacetyl)oxy]-, chloride, (l?, 3?, 5?). The empirical formula of trospium chloride is C25H30ClNO3 and its molecular weight is 427.97. The structural formula of trospium chloride is represented below:

Trilipix (fenofibric acid) is a lipid regulating agent available as delayed release capsules for oral administration. Each delayed release capsule contains choline fenofibrate, equivalent to 45 mg or 135 mg of fenofibric acid. The chemical name for choline fenofibrate is ethanaminium, 2-hydroxy-N,N,N-trimethyl, 2{4-(4-chlorobenzoyl)phenoxy] -2-methylpropanoate (1:1) with the following structural formula:

Macrodantin (nitrofurantoin macrocrystals) is a synthetic chemical of controlled crystal size. It is a stable, yellow, crystalline compound. Macrodantin (nitrofurantoin macrocystals capsule) is an antibacterial agent for specific urinary tract infections. It is available in 25 mg, 50 mg, and 100 mg capsules for oral administration.