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HISTAMINE Bioniche Histamine Phosphate Diagnostic Aid Indications And Clinical Uses: To test the ability of the gastric mucosa to produce hydrochloric acid. Contra-Indications: The gastric histamine test is contraindicated in patients with a history of hypersensitivity to histamine products, in patients with hypotension, severe hypertension, vasomotor instability, bronchial asthma (past or present), urticaria (past or present), or severe cardiac, pulmonary or renal disease. Precautions: Attacks of severe asthma or other…

HISMANAL® Johnson & Johnson Merck Astemizole Histamine H1-Antagonist Action And Clinical Pharmacology: Astemizole is a potent, long-acting, and selective histamine H1-antagonist. It produces a dose-related inhibition of skin reactions to intradermal histamine. Astemizole inhibits the nose reaction to nasal challenge with histamine and allergens. It inhibits the bronchial reaction to inhaled histamine and allergens in asthmatic patients. Astemizole has extremely weak serotonin antagonism, no anticholinergic properties, antagonism of dopamine and…

HOMATROPINE General Monograph, Mydriatic – Cycloplegic – Anticholinergic Homatropine HBr is a tertiary amine anticholinergic agent used topically to produce mydriasis and cycloplegia. It blocks the responses of the iris sphincter and ciliary muscle to cholinergic stimuli. Homatropine is less potent than atropine and has a shorter duration of action. Complete cycloplegia is not usually attainable. The maximum mydriatic effect occurs in about 10 to 30 minutes, and the maximum…

HIVID® Roche Zalcitabine Antiretroviral Agent Action And Clinical Pharmacology: Zalcitabine is a synthetic nucleoside analogue of the naturally occurring nucleoside 2-deoxycytidine in which the 3-hydroxyl group is replaced by hydrogen. Within cells, zalcitabine is converted to the active metabolite, dideoxycytidine 5-triphosphate (ddCTP), by cellular enzymes. ddCTP serves as an alternative substrate to deoxycytidine triphosphate (dCTP) for HIV-reverse transcriptase and inhibits the in vitro replication of HIV-1 by inhibition of viral…

HEXABRIX® 200 HEXABRIX® 320 Mallinckrodt Ioxaglate Meglumine – Ioxaglate Sodium Radiopaque Medium Action And Clinical Pharmacology: Following intravascular injection, Hexabrix is rapidly transported through the circulatory system to the kidneys and is excreted unchanged in the urine. The pharmacokinetics of intravascularly administered radiopaque contrast media are usually best described by a two compartment model with a rapid alpha phase for drug distribution and a slower beta phase for drug elimination….

HEXALEN® Lilly Altretamine Antineoplastic Agent Action And Clinical Pharmacology: Altretamine, better known in the scientific literature as hexamethylmelamine (HMM), is a synthetic cytotoxic antineoplastic s-triazine derivative. While altretamine bears structural similarity to, and cross-reactivity with, triethylenemelamine (TEM), a classical alkylating agent, evidence demonstrating altretamine to be an alkylating agent is not conclusive. Altretamine does not consistently demonstrate cross-resistance with classical alkylating agents used in rodent tumors or in human cancer…

HEPALEAN® Organon Teknika Heparin Sodium Anticoagulant Indications And Clinical Uses: Used in the treatment of thrombophlebitis, phlebothrombosis, and cerebral, coronary, and retinal vessel thrombosis to prevent extension of clots and thromboembolic phenomena. Also used prophylactically to prevent the occurrence of thromboembolism, and to prevent clotting during dialysis and other surgical procedures, particularly vascular surgery. When using in conjuction with dialysis machines or where heparin is added to glucose or saline…

HEPARIN LEO® Leo Heparin Sodium Anticoagulant Action And Clinical Pharmacology: Heparin is an anticoagulant which prevents the formation of thrombin by accelerating the neutralization of activated coagulation factors by naturally occurring inhibitors. Indications And Clinical Uses: For the prophylaxis and management of intravascular clotting and embolism in susceptible patients. It is also used in extra-corporeal circulation, i.e. heart-lung and renal dialysis machines and blood transfusions. Contra-Indications: Hemorrhagic disorders and patients…

HEPARIN: UNFRACTIONATED General Monograph Heparin Sodium Anticoagulant Action And Clinical Pharmacology: Heparin is a heterogeneous preparation of sulfated mucopolysaccharide polymers whose molecular weights range from 3 000 to 30 000 daltons, averaging between 12 000 and 15 000 daltons. Heparin exerts its anticoagulant activity by reversibly binding to antithrombin III (AT III), accelerating the ability of AT III to neutralize thrombin and activated coagulation factor X (Xa). The heparin-AT III…

HALOG® Preparations Westwood-Squibb Halcinonide Topical Corticosteroid Indications And Clinical Uses: Halcinonide, a synthetic fluorinated corticosteroid, is indicated for topical application for the relief of the inflammatory manifestations of acute or chronic corticosteroid responsive dermatoses; under occlusion, in the management of recalcitrant cases of psoriasis and neurodermatitis. Contra-Indications: Tuberculous, fungal and most viral lesions of the skin (including herpes simplex, vaccinia, and varicella). Patients with history of hypersensitivity to any of…