The therapeutic index of a histamine-1 (H1)antihistamine is the benefit-to-risk ratio of the medication and defines the range of doses and plasma concentrations over which the drug is effective and safe. In allergic rhinoconjunctivitis and urticaria, although the efficacy profiles of currently available H1-antihistamines are similar, these agents differ greatly with regard to safety, and this c...

Although second-generation antihistamines generally penetrate the blood-brain barrier to a lesser degree than the powerfully impairing firstgeneration antihistamines, many have been found to produce dose-related impairment of central nervous system (CNS) function. In contrast, fexofenadine has been determined to be truly nonimpairing, even at supraclinical doses. Crossover studies using placebo...

GENERIC NAME PAGE Brompheniramine 454 Carbinoxamine 454 Cetirizine 453 Chlorpheniramine 454 Cimetidine 455 Clemastine 454 Cromolyn sodium 455 Cyclizine 455 Cyproheptadine 454 Desloratadine 453 Dimenhydrinate 455 GENERIC NAME PAGE Diphenhydramine 454 Famotidine 455 Fexofenadine 453 Hydroxyzine 454 Loratadine 453 Meclizine 455 Nedocromil 455 Promethazine 455 Pyrilamine 455 Ranitidine 455 Tripelen...

Two rapid, simple, sensitive, selective and economic derivative spectrophotometric (first [D1] and second [D2]) and synchronous spectrofluorimetric (FDSFS and SDSFS) methods have been developed for the analysis of fexofenadine hydrochloride (FXD) in the presence of its different degradation products. Derivative spectrophotometry (D1) was used to measure FXD at 223 nm in the presence of its alka...

BACKGROUND Methadone disposition and pharmacodynamics are highly susceptible to interactions with antiretroviral drugs. Methadone clearance and drug interactions have been attributed to cytochrome P4503A4 (CYP3A4), but actual mechanisms are unknown. Drug interactions can be clinically and mechanistically informative. This investigation assessed effects of the protease inhibitor indinavir on met...

BACKGROUND The first generation antihistamines, such as diphenhydramine, are fairly potent muscarinic antagonists in addition to being H1 selective antihistamines. The antimuscarinic action is often not desirable since it is in part responsible for the drying of secretions in the airways and the sedative effect. We therefore examined a number of antihistamines for antimuscarinic effects on ion ...