VIAGRA® (sildenafil citrate) , an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5).

Verdeso Foam is a petrolatum-based emulsion aerosol foam containing the active ingredient desonide, a low-potency topical corticosteroid. Chemically, desonide is (11?,16?)-11,21-dihydroxy-16,17-[(1-methylethylidene)-bis(oxy)]-pregna-1,4-diene-3,20-dione.

VANOS (fluocinonide) Cream, 0.1% contains fluocinonide, a synthetic corticosteroid for topical dermatologic use. The corticosteroids constitute a class of primarily synthetic steroids used topically as anti-inflammatory and antipruritic agents. Fluocinonide has the chemical name 6 alpha, 9 alpha?­difluoro-11 beta, 21-dihydroxy-16 alpha, 17 alpha?­isopropylidenedioxypregna-1, 4-diene-3,20-dione 21-acetate. Its chemical formula is C26H32F2O7 and it has a molecular weight of 494.58.

VIOXX* (rofecoxib) is described chemically as 4-[4-(methylsulfonyl)phenyl]-3-phenyl-2(5H)-furanone. It has the following chemical structure:

VASOCIDIN (sulfacetamide and prednisolone) is a sterile topical ophthalmic solution combining an anti-infective and an adrenocortical steroid having the following composition:

Vivaglobin® Immune Globulin Subcutaneous (Human), is a pasteurized, polyvalent human normal immunoglobulin for subcutaneous infusion. Vivaglobin® is manufactured from large pools of human plasma by cold alcohol fractionation and is not chemically altered or enzymatically degraded.

VIRAMUNE is the brand name for nevirapine, a non-nucleoside reverse transcriptase inhibitor (NNRTT) with activity against Human Immunodeficiency Virus Type 1 (HIV-1). Nevirapine is structurally a member of the dipyridodiazepinone chemical class of compounds.

Velosulin (insulin human) ® BR is a clear solution of insulin in a phosphate buffer. The concentration of this product is 100 units of insulin per milliliter. This human insulin is structurally identical to the insulin produced by the pancreas in the human body. This structural identity is obtained by recombinant-DNA technology utilizing Saccharomyces cerevisiae (bakers' yeast) as the production organism. When a U-100 insulin syringe is used to deliver the insulin, the effect of Velosulin (insulin human) ® BR begins approximately ? hour after the injection. The effect lasts up to approximately 8 hours with a maximal effect between the 1 st and 3 rd hour.

AQUASOL A® Parenteral (water-miscible vitamin A Palmitate) provides 50,000 USP Units of vitamin A per mL as retinol (C20H30O) in the form of vitamin A palmitate, a light yellow to amber oil.The structural formula of retinol is:

Verelan® (verapamil hydrochloride capsules) is a calcium ion influx inhibitor (slow channel blocker or calcium ion antagonist). Verelan is available for oral administration as a 360 mg hard gelatin capsule (lavender cap/yellow body), a 240 mg hard gelatin capsule (dark blue cap/yellow body), a 180 mg hard gelatin capsule (light grey cap/yellow body), and a 120 mg hard gelatin capsule (yellow cap/yellow body). These pellet filled capsules provide a sustained-release of the drug in the gastrointestinal tract. The structural formula of verapamil HCl is given below: