SUMMARYantibiotics). However, there are few general reviews mainly referring to drug-drug interactions between
The reports of interactions between benzodiazepinesBZPs and other drugs that have been published to (BZPs) and other drugs (e.g. antidepressants, sedate (1-4). lective serotonin reuptake inhibitors, antiulcer drugs, Drug interactions can be pharmacokinetic or pharantiepileptic drugs, macrolide antibiotics) during macodynamic in nature. Pharmacodynamic intertheir combined use are reviewed. In general, metaactions occur at biologically active sites (i.e. receptors) bolism of BZPs is delayed when combined with a and change the pharmacological activity of a drug number of other drugs but some reports have sugwithout necessarily altering the kinetics of either agent. gested otherwise.By contrast, in pharmacokinetic interactions, one drug In recent years, the cytochrome P450 (P450 or CYP) specifically affects the blood concentration of another isoenzyme that catalyses the metabolism of BZPs has drug by altering its kinetics (absorption, distribution, also been identified. BZPs are mainly catalysed by metabolism or excretion). As for the mechanisms of CYP3A4. When published reports are studied, it pharmacokinetic interactions, it is desirable to refer to appears necessary to be exceptionally careful about our general remarks (5). interactions mainly between BZPs and selective seroIn this paper, we shall focus on the mechanisms of tonin reuptake inhibitors, cimetidine, antiepileptic metabolic kinetic interactions between BZPs and other drugs, macrolide antibiotics and antimycotics. More drugs, as well as reviewing the evidence for, and information is necessary to identify individuals clinical significance, these interactions. at greatest risk of drug interactions and adverse events.