Short answer: Zolpidem (Ambien) is a prescription sleep medicine that acts on the same brain receptors as benzodiazepines. It is a Schedule IV controlled substance. Its boxed warning covers complex sleep behaviors such as sleepwalking and sleep-driving, and women are prescribed lower doses because they clear it more slowly.
Key takeaways
- What it is: Zolpidem is a nonbenzodiazepine hypnotic ("z-drug") and a Schedule IV controlled substance in the US.
- Main uses: Insomnia.
- Timing: effects start in about 30 minutes and last 6 to 8 hours.
- Most dangerous mix: Opioids, which can cause profound sedation, slowed breathing.
- Naloxone: it does not reverse this drug, but give it whenever opioids could be involved.
- Dependence risk: Moderate.
- Legal route: only with a prescription from a DEA-registered clinician, filled by a licensed pharmacy.
What is zolpidem?
Zolpidem is approved for short-term treatment of insomnia with difficulty falling asleep. Extended-release zolpidem also helps people stay asleep, and low-dose sublingual zolpidem is for waking in the middle of the night with at least four hours left in bed.
Quick facts
| Fact | Zolpidem |
|---|---|
| Generic name | Zolpidem tartrate |
| Brand names | Ambien, Ambien CR, Edluar, Intermezzo |
| Drug class | Nonbenzodiazepine hypnotic ("Z-drug") |
| US legal status | Schedule IV, prescription only |
| Approved uses | Insomnia |
| Forms | Tablets, extended-release tablets, sublingual tablets |
| Onset | About 30 minutes |
| Half-life | About 2.5 hours |
| Broken down by | CYP3A4 |
How long does zolpidem last?
- Starts working: About 30 minutes
- Effects last: 6 to 8 hours
- Half-life: About 2.5 hours
Its half-life is about 2.5 hours, and most is gone within a day.
Timing varies with the dose, the form, how it is taken, liver and kidney function, age, and other drugs taken at the same time.
What are the biggest risks of zolpidem?
The FDA requires boxed warnings, its strongest, on zolpidem products, including:
- Complex sleep behaviors, including sleepwalking, sleep-driving, and other activities while not fully awake, have caused serious injuries and deaths. Stop the medicine if one occurs, and do not take it if you have had one before.
Common side effects include drowsiness, dizziness, headache, diarrhea, and a "drugged" feeling. Next-morning impairment can affect driving even when the person feels awake.
Other risks include memory loss for events after a dose, abnormal thinking and behavior, worsening depression, and dependence with long-term use.
What should you never mix with zolpidem?
| Combined with | What happens | Label guidance |
|---|---|---|
| Opioids | Profound sedation, slowed breathing | Avoid unless no alternative |
| Alcohol | Greater impairment and complex sleep behaviors | Do not drink the same evening |
| Benzodiazepines and other sleep aids | Additive sedation | Avoid combining |
| Ketoconazole, ritonavir | Raise zolpidem levels | Consider a lower dose |
| Rifampin | Lowers zolpidem levels | May reduce effect |
Check any combination with the DoseUses combination checker or ask a pharmacist.
What are the signs of a zolpidem overdose, and what should you do?
Zolpidem overdose causes deep sleepiness progressing to coma. Breathing problems are more likely when it is combined with alcohol, opioids, or other sedatives.
If someone may have overdosed
- Call 911 if the person is unresponsive, hard to wake, or breathing slowly.
- For advice when the person is awake and stable, call Poison Help at 1-800-222-1222 (US, free, 24 hours).
- If opioids could be involved, including pills not from a pharmacy, give naloxone if you have it. Naloxone does not reverse zolpidem, but it will not harm the person.
- Stay with the person and place them on their side if they are drowsy or vomiting.
What is zolpidem withdrawal like, and how long does it last?
After regular use, stopping zolpidem can cause rebound insomnia and, less often, withdrawal symptoms such as anxiety, shakiness, sweating, and, rarely, seizures after high-dose use.
- Nights 1 to 3Rebound insomniaWorse sleep than before treatment for a few nights.
- Days 1 to 7Withdrawal in long-term usersAnxiety, irritability, tremor, sweating, and nausea.
- WeeksRecoverySleep usually settles; CBT-I helps.
See the withdrawal timelines and the full zolpidem withdrawal guide.
Is zolpidem legal?
In the United States, zolpidem is a Schedule IV controlled substance. The only legal way to get it is with a prescription from a clinician registered with the Drug Enforcement Administration (DEA), filled by a licensed pharmacy. Depending on state law, that can be a physician, nurse practitioner, or physician assistant.
- Refills: a Schedule IV prescription can be refilled up to five times within six months of the date it was written. After that, a new prescription is needed.
- Telehealth: federal flexibilities let DEA-registered clinicians prescribe Schedule II to V medicines after a telemedicine visit, without a prior in-person exam, through December 31, 2026. A permanent DEA rule was under final review in late 2026. State rules can be stricter.
- Monitoring: prescribers and pharmacists in most states check a prescription drug monitoring program, a database of controlled-substance prescriptions, before prescribing or dispensing.
Outside the United States
| Country | Status |
|---|---|
| United Kingdom | Class C; prescription only |
| Canada | Prescription medicine; not a scheduled controlled drug |
| Australia | Schedule 4 prescription medicine |
| International | Schedule IV of the 1971 Convention on Psychotropic Substances |
Frequently asked questions about zolpidem
Why do women get a lower Ambien dose?
Women clear zolpidem more slowly, so the same dose leaves more drug in the blood the next morning and can impair driving.
Is zolpidem a benzodiazepine?
No, but it works on the same GABA-A receptors and has similar risks of dependence and withdrawal.
What are complex sleep behaviors?
Doing activities while not fully awake, such as walking, cooking, or driving, without remembering it later. They can cause serious injuries.
How long does zolpidem stay in your system?
Its half-life is about 2.5 hours, and most is gone within a day.
Sources
- Ambien (zolpidem) prescribing information, DailyMed, US National Library of Medicine.
- FDA adds Boxed Warning for risk of serious injuries caused by sleepwalking with certain prescription insomnia medicines, US Food and Drug Administration, 2019.
- Controlled Substance Schedules, DEA Diversion Control Division.
- 21 CFR 1306.22, Refilling of prescriptions (Schedules III and IV), Electronic Code of Federal Regulations.
- Prescribing controlled substances via telehealth, US Department of Health and Human Services.
- BeSafeRx: Your Source for Online Pharmacy Information, US Food and Drug Administration.
- Safe Pharmacy, National Association of Boards of Pharmacy.
- One Pill Can Kill, US Drug Enforcement Administration.
This guide summarizes the sourced DoseUses Zolpidem profile, written from FDA labels, DEA rules, and federal health agencies. It is educational and is not medical advice. Last updated October 5, 2026.
