Anaphylaxis & angioedema. Discontinue use if psychiatric & paradoxical reactions occur. Complex sleep-related reactions; depression; history of drug or alcohol abuse & psychiatric disorders; rebound insomnia. May develop tolerance & dependence; induce anterograde amnesia. Avoid abrupt w/drawal. Co-administration w/ alcohol & other CNS depressants. May affect ability to drive & use machines. Hepatic insufficiency. Pregnancy. Not recommended during lactation. Childn <18 yr. Elderly.