Read this Ambien dosage guide with information on available forms of zolpidem, typical and maximum dosages, adjustments for health conditions, and more. Ambien, Ambien CR: Use lowest effective dose; take only once per night immediately before bedtime with at least 7-8 hr remaining before the planned time of awakening Dosages for Ambien and Ambien CR vary. Doctors will usually start treatment by prescribing a low dose and adjust dosage as needed. Age and liver problems may affect dosage. Do not change your dose or stop using it without first checking with your doctor. Your doctor may want you to gradually reduce the amount you are using before stopping completely. Ambien (zolpidem) is prescribed for insomnia caused by problems falling asleep or staying asleep in adults. Learn about its dosages, forms, and more. Detailed dosage guidelines and administration information for Ambien (zolpidem tartrate). Includes dose adjustments, warnings and precautions. This article describes the dosages of Ambien, as well as its strengths and how to take it. To learn more about Ambien, see this in-depth article.