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HALFAN™ SmithKline Beecham Halofantrine HCl Antimalarial Action And Clinical Pharmacology: Halofantrine is schizonticidal and exerts its action at the erythrocytic stage of the life cycle (trophozoite and schizont). It is not effective against exo-erythrocytic (hepatic) schizonts or against the sporozoite, merozoite or gametozoite stages of the life cycle of Plasmodium species investigated. The precise mechanism of action of halofantrine is not certain. It has been hypothesized that halofantrine interferes with…

HALOTESTIN® Pharmacia & Upjohn Fluoxymesterone Androgenic – Anabolic Steroid Action And Clinical Pharmacology: Endogenous androgens are responsible for normal growth and development of the male sex organs and for maintenance of secondary sex characteristics. These effects include growth and maturation of the prostate, seminal vesicles, penis, and scrotum; development of male hair distribution, such as beard, pubic, chest, and axillary hair; laryngeal enlargement, vocal cord thickening, and alterations in body…

HAVRIX™ SmithKline Beecham Hepatitis A Vaccine (Inactivated) Active Immunization Agent against infection by Hepatitis A virus Action And Clinical Pharmacology: Hepatitis A vaccine (inactivated) confers immunity against hepatitis A virus (HAV) infection by inducing the production of specific anti-HAV antibodies. In clinical studies involving subjects of 18 to 50 years of age, specific humoral antibodies against HAV were detected in more than 88% of vaccinees at day 15 and 99%…

HABITROL® Novartis Consumer Health Nicotine Smoking Cessation Aid Action And Clinical Pharmacology: Habitrol delivers S(-)-nicotine, the active component of tobacco smoke, transdermally into the systemic circulation, continuously over 24 hours. Habitrol releases S(-)-nicotine in controlled amounts at a rate sufficient to produce plasma nicotine concentrations comparable to trough levels observed in smokers before smoking a cigarette. Because of the low, continuous delivery of S(-)-nicotine through the skin, Habitrol does not…

HALCION® Pharmacia & Upjohn Triazolam Hypnotic Action And Clinical Pharmacology: Triazolam is a benzodiazepine hypnotic with a very short elimination half-life (about 3 hours). In sleep laboratory studies of 1 to 21 days duration, triazolam significantly decreased sleep latency, increased duration of sleep and decreased the number of nocturnal awakenings. However, after 2 weeks of consecutive nightly administration, the drug’s effect on total wake time was decreased, and the values…

HALDOL® LA Janssen-Ortho Haloperidol Decanoate Antipsychotic Action And Clinical Pharmacology: Haloperidol decanoate, an ester derivative of haloperidol obtained from condensation of haloperidol with decanoic acid possesses the antipsychotic properties of haloperidol. When it is administered as an i.m. depot in sesame oil, esterases present in blood and tissues hydrolyze haloperidol decanoate to provide a slow release of the active neuroleptic haloperidol from the depot into the systemic circulation. The onset…

HALDOL® Janssen-Ortho Haloperidol Antipsychotic Action And Clinical Pharmacology: Haloperidol is a butyrophenone derivative with antipsychotic properties that has been considered particularly effective in the management of hyperactivity, agitation, and mania. Haloperidol is an effective neuroleptic and also possesses antiemetic properties; it has a marked tendency to provoke extrapyramidal effects and has relatively weak alpha-adrenolytic properties. It may also exhibit hypothermic and anorexiant effects and potentiate the action of barbiturates, general…

GYNE-T® Intrauterine Copper Contraceptive Janssen-Ortho Intrauterine Copper Intrauterine Contraceptive Description: The Gyne-T copper intrauterine consists of a polyethylene support in the shape of a “T” (horizontal arm 32 mm in length and 1.59 mm in diameter. The vertical arm is 36 mm in length and 1.52 mm in diameter. The “T” carries 120 mg of copper wire (0.25 mm in diameter; 265 mm in length) wound around the vertical arm…

GUAIFENESIN General Monograph Glyceryl Guaiacolate Expectorant Pharmacology: Guaifenesin is believed to produce its effect through a local or reflex irritant action that activates the vagus nerve to stimulate secretion or respiratory tract fluid. This is thought to increase sputum volume, decrease its viscosity, enhance the flow of less viscid secretions and promote mucociliary clearance. Pharmacokinetics: The drug is rapidly absorbed from the gastrointestinal tract and excreted in the urine. Indications:…

GYNECURE™ Pfizer Consumer Tioconazole Antifungal Agent Action And Clinical Pharmacology: Tioconazole is a member of the imidazole class of antifungal agents. Although the mode of action of tioconazole has not as yet been determined, several studies have demonstrated that the imidazoles inhibit ergosterol synthesis in fungi by blocking C-14 demethylation. As a result, there is an accumulation of C-14 methyl sterol intermediates like langosterol, and a decrease in ergosterol. Langosterol…