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Resources › Psychotropics A-Z › Zolpidem | Ambien | Ambien
Nonbenzodiazepine Hypnotic (Z-drug)

Zolpidem | Ambien

Clinical Overview

Zolpidem is a nonbenzodiazepine hypnotic indicated for the short-term treatment of insomnia. It is available in multiple formulations including immediate-release, controlled-release, sublingual, and oral spray to address different types of sleep difficulties. It has high selectivity for GABA-A receptors containing alpha-1 subunits, providing sleep-promoting effects with minimal next-day impairment.

Primary Clinical Applications

Zolpidem is indicated for insomnia characterized by difficulties with sleep initiation (immediate-release formulations) and sleep maintenance (controlled-release and middle-of-the-night formulations). Different formulations target specific sleep problems: Ambien for sleep onset, Ambien CR for sleep maintenance, and Intermezzo for middle-of-the-night awakening.

Mechanism and Clinical Benefits

Zolpidem selectively binds to GABA-A receptors containing alpha-1 subunits, which are responsible for sedation and sleep promotion. This selectivity provides hypnotic effects while minimizing the muscle relaxation, anticonvulsant, and anxiolytic effects seen with benzodiazepines, resulting in more natural sleep architecture.

Clinical Considerations

Zolpidem requires gender-specific dosing due to slower clearance in women. The medication can cause complex sleep behaviors and next-day impairment, particularly at higher doses. Different formulations have specific timing requirements and contraindications based on remaining sleep time. The risk of tolerance and dependence exists but may be lower than with benzodiazepines.

Prescribing Information

Dosing & Administration

Insomnia – Sleep Initiation (Ambien):

  • Women: 5 mg immediately before bedtime
  • Men: 5-10 mg immediately before bedtime
  • Elderly: 5 mg immediately before bedtime

Insomnia – Sleep Maintenance (Ambien CR):

  • Women: 6.25 mg immediately before bedtime
  • Men: 6.25-12.5 mg immediately before bedtime
  • Elderly: 6.25 mg immediately before bedtime

Middle-of-Night Awakening (Intermezzo):

  • Women: 1.75 mg sublingual
  • Men: 3.5 mg sublingual
  • Requirement: ≥4 hours of sleep time remaining

Sublingual (Edluar):

  • Women: 5 mg sublingual
  • Men: 5-10 mg sublingual

Administration:

  • Take on empty stomach for faster onset
  • Ensure 7-8 hours available for sleep (except Intermezzo)
  • Do not take with or after alcohol

Indications

  • Short-term treatment of insomnia characterized by difficulties with sleep initiation
  • Ambien CR: Sleep initiation and/or sleep maintenance
  • Intermezzo: Middle-of-the-night insomnia with ≥4 hours sleep time remaining

Contraindications

  • Known hypersensitivity to zolpidem
  • Intermezzo: <4 hours of sleep time remaining

Warnings & Precautions

  • Complex sleep behaviors: Sleep-driving, sleep-eating, and other activities while not fully awake may occur without alcohol or other CNS depressants; discontinue immediately if these occur
  • CNS depression: Risk increased with alcohol and other CNS depressants
  • Next-day impairment: Particularly with CR formulation and higher doses
  • Withdrawal effects: May occur with abrupt discontinuation
  • Memory impairment: Anterograde amnesia possible
  • Depression: May worsen depression or suicidal ideation

Drug Interactions

  • CNS depressants: Enhanced sedation and respiratory depression
  • Alcohol: Contraindicated – dangerous potentiation
  • CYP3A4 inhibitors: May increase zolpidem levels
  • Rifampin: Significantly reduces zolpidem effectiveness

Adverse Reactions

Common (≥5%):

  • Drowsiness, dizziness, diarrhea, drugged feeling

Next-day effects:

  • Impaired driving ability, especially with CR formulation

Serious:

  • Complex sleep behaviors, severe allergic reactions
  • Falls, respiratory depression

Special Populations

  • Women: Lower doses required due to slower clearance
  • Elderly: 5 mg maximum due to increased sensitivity
  • Hepatic Impairment: 5 mg maximum dose
  • Pregnancy: Category C – avoid during pregnancy
Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. Always consult with qualified healthcare professionals before making any treatment decisions. Individual patient circumstances may vary significantly.