Benzodiazepines are widely used for a variety of conditions in psychiatric field. In this article, the author reviewed the indications, the effects on anxiety and sleep disorders, the side effects, the drug-drug interactions, and the tapering strategies. Benzodiazepines were relatively safe and useful for the treatment of anxiety and sleep disorders. However, used clinically, benzodiazepines can induce many adverse effects (e. g. over-sedation, cognitive impairments, paradoxical effects, dependence and withdrawal symptoms, and so on). Currently available informations about their effects on the developing fetus is controversial. For this reason, pregnant women and nursing mother should be cautioned against the use of benzodiazepines. Drug-drug interactions have to be considered in combination treatments. For the tapering issues, gradual tapering was important to prevent the withdrawal symptoms. Especially, the tapering schedules have to be individualized for the each long-term benzodiapzepine users.