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ADRUCIL® Pharmacia & Upjohn Fluorouracil Antineoplastic Action And Clinical Pharmacology: The mechanism of action of fluorouracil is mainly related to competitive inhibition of thymidylate synthetase, the enzyme catalyzing the methylation of deoxyuridylic acid to thymidylic acid. The consequent thymidine deficiency results in inhibition of deoxyribonucleic acid (DNA) synthesis, thus inducing cell death. Also, moderate inhibition of ribonucleic acid (RNA) and incorporation of fluorouracil into RNA have been observed. The predominant…

ADALAT® Bayer Nifedipine Antianginal Action And Clinical Pharmacology: Nifedipine is a calcium ion influx inhibitor (calcium entry blocker or calcium ion antagonist). The antianginal effect of this group of drugs is believed to be related to its specific cellular action of selectively inhibiting transmembrane influx of calcium ions into cardiac muscle and vascular smooth muscle. The contractile processes of these tissues are dependent upon the movement of extracellular calcium into…

ADALAT® PA 10 ADALAT® PA 20 Bayer Nifedipine Antihypertensive Action And Clinical Pharmacology: Nifedipine is a calcium ion influx inhibitor (calcium channel blocker or calcium ion antagonist). The antihypertensive action of this group of drugs is believed to be related to its specific cellular action of selectively inhibiting transmembrane influx of calcium ions into vascular smooth muscles. The contractile processes of vascular smooth muscle are dependent upon the movement of…

ADALAT® XL® Bayer Nifedipine Antianginal – Antihypertensive System Components and Performance: Adalat XL extended release tablets, while similar in appearance to a conventional tablet, nonetheless consist of a semipermeable membrane surrounding an osmotically active drug core. The core itself is divided into 2 layers: an “active” layer containing the drug, and a “push” layer containing pharmacologically inert, but osmotically active components. As water from the gastrointestinal tract enters the tablet,…

ACTIFED® Warner-Lambert Consumer Healthcare Triprolidine HCl – Pseudoephedrine HCl Antihistaminic – Decongestant Indications And Clinical Uses: The prophylaxis and treatment of symptoms associated with the common cold, acute and subacute sinusitis, acute eustachian salpingitis, serous otitis media with eustachian tube congestion, aerotitis media and croup; in allergic conditions which respond to antihistamines, including hay fever, pollenosis, allergic and vasomotor rhinitis. Contra-Indications: Hypersensitivity to triprolidine or pseudoephedrine. Should not be administered…

ACTIFED™ PLUS EXTRA STRENGTH Warner-Lambert Consumer Healthcare Acetaminophen – Pseudoephedrine HCl – Triprolidine HCl Analgesic – Antipyretic – Antihistamine – Decongestant Indications And Clinical Uses: The prophylaxis and treatment of symptoms associated with the common cold, acute and subacute sinusitis; in allergic conditions which respond to antihistamines, including hay fever, pollenosis, allergic and vasomotor rhinitis. Relieves nasal congestion, runny nose, sneezing, sinus pain, headache and fever. Contra-Indications: Hypersensitivity to triprolidine,…

ACTINAC® Hoechst Marion Roussel Chloramphenicol – Hydrocortisone Acetate – Butoxyethylnicotinate – Allantoin – Precipitated Sulfur Acne Therapy Action And Clinical Pharmacology: The roles of the individual ingredients in Actinac and their collective mechanisms of action in the topical treatment of acne have not been elucidated. Hydrocortisone, chloramphenicol and precipitated sulfur are however, widely recognized for their respective anti-inflammatory, antibacterial and desquamating properties. Chloramphenicol is usually bacteriostatic in action, but may…

ACTIVASE® rt-PA Roche Alteplase Fibrinolytic Agent Action And Clinical Pharmacology: Alteplase is a serine protease which has the property of fibrin-enhanced conversion of plasminogen to plasmin. It produces minimal conversion of plasminogen in the absence of fibrin; and when introduced into the systemic circulation, alteplase binds to fibrin in a thrombus and converts the entrapped plasminogen to plasmin. This initiates local fibrinolysis with minimal systemic effects. Following administration of alteplase…

ACYCLOVIR SODIUM FOR INJECTION Novopharm Antiviral Action And Clinical Pharmacology: Acyclovir, a synthetic acyclic purine nucleoside analog, is a substrate with a high degree of specificity for herpes simplex and varicella-zoster-specified thymidine kinase. Acyclovir is a poor substrate for host cell-specified thymidine kinase. Herpes simplex and varicella-zoster-specified thymidine kinase transform acyclovir to its monophosphate which is then transformed by a number of cellular enzymes to acyclovir diphosphate and acyclovir triphosphate….

ACEL-P™ Wyeth-Ayerst Acellular Pertussis Vaccine Adsorbed Active Immunizing Agent Action And Clinical Pharmacology: Pertussis disease (whooping cough) is caused by a gram-negative coccobacillus, B. pertussis. Acellular pertussis vaccine adsorbed is an acellular pertussis vaccine indicated for primary immunization against disease caused by B. pertussis. Pertussis (whooping cough) has 3 typical stages (catarrhal, paroxysmal, and convalescent). The second phase is characterized by severe paroxysmal coughing that persists for weeks. The disease…