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VITAMIN B1 General Monograph Thiamine Vitamin Pharmacology: Vitamin B1 is a water soluble B complex vitamin. In vivo, vitamin B1 combines with adenosine triphosphate (ATP) to form thiamine pyrophosphate, also known as cocarboxylase, a coenzyme. Its role in carbohydrate metabolism is the decarboxylation of pyruvic acid and alpha-ketoacids to acetaldehyde and carbon dioxide. Increased levels of pyruvic acid in the blood indicate vitamin B1 deficiency. Vitamin B1 depletion can occur…

VITAMIN B2 General Monograph Riboflavin Vitamin Pharmacology: Vitamin B2 is a water-soluble, B complex vitamin. It is required for tissue respiration and is also indirectly involved in maintaining erythrocyte integrity. Vitamin B2 deficiency often accompanies pellagra and other B vitamin deficiency states and is also associated with conditions causing negative protein balance, such as chronic diarrhea, malabsorption syndrome, diabetes mellitus and chronic debilitating diseases. Deficiency is manifested by angular stomatitis,…

VIROPTIC® Glaxo Wellcome Trifluridine Topical Antiviral Action And Clinical Pharmacology: Trifluridine is phosphorylated by a cellular thymidine kinase to its nucleotide monophosphate. Trifluridine monophosphate is an inhibitor of thymidylate synthetase, the target enzyme for the action of monofluorinated pyrimidines. Trifluridine has been demonstrated to combine slowly and irreversibly with thymidylate synthetase in a reaction that requires ATP. Trifluridine monophosphate is further phosphorylated by cellular enzymes to the triphosphate which is…

VISIPAQUE™ Nycomed Imaging A.S. Iodixanol Nonionic Radiographic Contrast Medium Action And Clinical Pharmacology: Immediately following rapid intravascular injection, iodixanol reaches peak plasma concentration and is then rapidly distributed throughout the extracellular fluid compartment. It will opacify those vessels in the path of flow of the contrast medium, permitting radiographic visualization of the vasculature of the internal structures until significant dilution and elimination occurs. The degree of density enhancement is directly…

VIPRINEX® Knoll Ancrod Anticoagulant Action And Clinical Pharmacology: Ancrod, a thrombin-like enzyme obtained from the venom of the Malayan Pit Viper (Agkistrodon rhodostoma), is highly specific for fibrinogen, producing anticoagulation by defibrinogenation. Enzymatically, Ancrod cleaves fibrinogen to split off the A-fibrinopeptides (A, AY and AP), but not the B-fibrinopeptide. The resulting fibrin polymers are imperfectly formed and much smaller in size (1 to 2 m long) than the fibrin polymers…

Virazole (Lyophilized) ICN Ribavirin Antiviral Action And Clinical Pharmacology: Ribavirin is active against respiratory syncytial virus (RSV). In cell cultures, the inhibitory activity of ribavirin for RSV is selective. The mechanism(s) of action is unknown, although evidence exists that inhibition of other RNA and DNA viruses may be due to ribavirin competition with guanosine in formation of viral mRNA cap structures and/or interference with enzymes responsible for functional methylation of…

VIQUIN FORTE® ICN Hydroquinone – Glycolic Acid Depigmentation Agent – Moisturizer Action And Clinical Pharmacology: Hyperpigmentation refers to the brown skin spots caused by an excess of the skin pigment melanin in certain areas. It can be hereditary as are freckles, caused by sun damage, occur with increasing age, or be related to pregnancy or the use of oral contraceptives. Hyperpigmentation usually develops gradually and increases with sun exposure. Skin…

VIDEX™ Bristol Didanosine Antiretroviral Agent Action And Clinical Pharmacology: Didanosine is a synthetic, purine nucleoside analogue of deoxyadenosine, active against the Human Immunodeficiency Virus (HIV). Didanosine inhibits the in vitro replication of HIV in human primary cells cultures and in established cell lines. The active antiviral metabolite, dideoxyadenosine-triphosphate (ddATP), is formed in several steps by phosphorylation of didanosine by cellular enzymes. Inhibition of HIV reverse transcriptase by ddATP is through…

VINCRISTINE SULFATE INJECTION USP Faulding Antineoplastic Action And Clinical Pharmacology: The mode of action of vincristine has not been completely delineated. Evidence is available from in vitro studies that vincristine inhibits spindle formation and is associated with the reversible binding of vincristine to spindle proteins in the S phase. Vincristine has also been found to interfere with RNA synthesis. It has also been shown to stop cell reproduction in metaphase,…

VIOFORM® HYDROCORTISONE Novartis Pharmaceuticals Clioquinol – Hydrocortisone Antibacterial – Antifungal – Topical Corticosteroid Action And Clinical Pharmacology: Clioquinol, the antimicrobial component of Vioform Hydrocortisone, is active against a broad spectrum of pathogenic microorganisms, including fungi (e.g., Candida, Microsporum, Trichophyton) and gram-positive bacteria (e.g., Staphylococci). Clioquinol has only a slight inhibitory effect on gram-negative bacteria. Clioquinol exerts a bacteriostatic, rather than a bactericidal action. Hydrocortisone is a mild glucocorticoid with an…