Zolpidem

Non-benzodiazepine hypnotic (Z-drug), imidazopyridine

ATC code: N05CF02 (Zolpidem)

Brand names

Ambien, Ambien CR, Intermezzo, Edluar

Mechanism of action

Selective agonist of the benzodiazepine site of the GABA-A receptor with preference for the α1 subunit. Enhances GABAergic inhibition and shortens sleep onset latency. The α1 selectivity explains the predominantly hypnotic effect and minimal muscle-relaxant and anticonvulsant effects compared with classical benzodiazepines. Rapid onset (15–30 minutes), short half-life (2–3 hours) – suitable for sleep-onset insomnia, less so for early-morning awakenings. Metabolised via CYP3A4 (75%) and CYP1A2.

Indications

Insomnia and sleep disorders

Second line

Zolpidem is a non-benzodiazepine Z-hypnotic. AEMPS authorises it for insomnia in short courses up to 4 weeks, including the taper. SEN 2022 and 2021 place cognitive-behavioural therapy for insomnia (CBT-I) first; pharmacotherapy (zolpidem, eszopiclone, prolonged-release melatonin) is second-line when CBT-I fails or is unfeasible. Cochrane 2018 shows Z-drugs shorten sleep onset by 18–22 minutes – clinically modest. Long-term use leads to tolerance and dependence. The marketing position of «a safe alternative to benzodiazepines» does not match the regulatory stance: and added warnings about parasomnias and complex sleep behaviours. If zolpidem was prescribed without discussion of CBT-I, consider seeking a second opinion.

Sources

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

Jet lag disorder

Not recommended

Zolpidem is sometimes prescribed for jet lag «to help fall asleep in the new time zone». AEMPS does not authorise this indication. Zolpidem has a short half-life and helps sleep onset but does not shift the circadian rhythm – sleep architecture does not normalise the next day. For jet lag, 2020 recommends melatonin 0.5–5 mg 30 minutes before the desired sleep (stronger evidence) and behavioural strategies (morning light in the new time zone, avoiding caffeine and alcohol on the flight). Zolpidem use on planes is associated with complex sleep behaviours (walking, eating without recall). If zolpidem was prescribed solely for jet lag, consider seeking a second opinion.

Sources

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Official sources

Direct links to regulator labels. Open in a new tab.

AEMPS / CIMA

Spanish Medicines Information Centre (CIMA)

Label dated: 10/21/2024

FDA / DailyMed

FDA — DailyMed Drug Labels

Label dated: 04/15/2026

Safety

Contraindications

Hypersensitivity to zolpidem
Severe respiratory failure
Sleep apnoea syndrome
Severe hepatic impairment
Myasthenia gravis
Age under 18 years
Acute alcohol or opioid intoxication

Serious adverse effects

Complex sleep behaviours: sleepwalking, sleep-driving, sleep-eating without recall
Anterograde amnesia
Paradoxical reactions (agitation, aggression, hallucinations)
Dependence and withdrawal syndrome on abrupt discontinuation
Falls and fractures in older adults
Respiratory depression when combined with opioids or alcohol

Common adverse effects

Next-day drowsiness
Headache
Dizziness
Confusion and memory impairment
Nausea
Dry mouth

PregnancyFDA C

FDA Category C. Limited data. Third-trimester exposure may cause neonatal CNS depression, hypotonia, poor sucking and withdrawal syndrome. AEMPS: use only when essential, in short courses. SEGO prefers behavioural strategies and melatonin for insomnia in pregnancy.

Breastfeeding

Compatible in short courses. Hale L3. Transfers into milk in small amounts (under 0.02% of maternal dose). Long-term use can cause infant sedation and poor feeding. eLactancia – «low risk» for single doses. Take after the evening feed.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Frequently asked

What is Zolpidem used for?

Zolpidem is evaluated for the following indications with varying evidence strength: Insomnia and sleep disorders (evidence tier B), Jet lag disorder (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Zolpidem?

Common side effects of Zolpidem (≥ 1 in 100): Next-day drowsiness, Headache, Dizziness, Confusion and memory impairment, Nausea, Dry mouth. See the Safety section for uncommon and serious reactions.

Is Zolpidem safe during pregnancy?

FDA category C. FDA Category C. Limited data. Third-trimester exposure may cause neonatal CNS depression, hypotonia, poor sucking and withdrawal syndrome. AEMPS: use only when essential, in short courses. SEGO prefers behavioural strategies and melatonin for insomnia in pregnancy.

Is Zolpidem compatible with breastfeeding?

Who should not take Zolpidem?

Zolpidem is contraindicated in: Hypersensitivity to zolpidem; Severe respiratory failure; Sleep apnoea syndrome; Severe hepatic impairment; Myasthenia gravis. Full list in the Safety section.

Mechanism of action

Indications

Insomnia and sleep disorders

Second line

Sources

Safety

Contraindications

Hypersensitivity to zolpidem
Severe respiratory failure
Sleep apnoea syndrome
Severe hepatic impairment
Myasthenia gravis
Age under 18 years
Acute alcohol or opioid intoxication

Serious adverse effects

Complex sleep behaviours: sleepwalking, sleep-driving, sleep-eating without recall
Anterograde amnesia
Paradoxical reactions (agitation, aggression, hallucinations)
Dependence and withdrawal syndrome on abrupt discontinuation
Falls and fractures in older adults
Respiratory depression when combined with opioids or alcohol

Common adverse effects

Next-day drowsiness
Headache
Dizziness
Confusion and memory impairment
Nausea
Dry mouth

PregnancyFDA C

Breastfeeding

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Frequently asked

What is Zolpidem used for?

What are the side effects of Zolpidem?

Is Zolpidem safe during pregnancy?

Is Zolpidem compatible with breastfeeding?

Who should not take Zolpidem?

Zolpidem is contraindicated in: Hypersensitivity to zolpidem; Severe respiratory failure; Sleep apnoea syndrome; Severe hepatic impairment; Myasthenia gravis. Full list in the Safety section.