is ambien a schedule 4 drug why is ambien considered a controlled substance

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Is ambien a schedule 4 drug, why is ambien considered a controlled substance

is ambien a schedule 4 drug --> is ambien a schedule 4 drug
is ambien a schedule 4 drug is ambien a class 4 drug is ambien a schedule drug is ambien a schedule 4 drug what classification is ambien is zolpidem a schedule 4 drug is ambien a schedule iv drug is zolpidem a schedule drug why is ambien considered a controlled substance