Description
Zolpidem Tartrate – Hypnotic Agent for Insomnia (Rx)
Zolpidem tartrate is a sleep medicine that helps people who have trouble falling asleep for a short time. It works by specifically attaching to a part of the GABA-A receptor called the benzodiazepine-1 (BZ1) receptor, which increases calming signals in the brain and helps induce sleep
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Unlike traditional benzodiazepines, zolpidem demonstrates relative selectivity for α1-subunit-containing GABA-A receptors, which are primarily associated with sedation rather than anxiolysis or muscle relaxation. This receptor specificity contributes to its rapid sleep induction with reduced residual next-day sedation when used appropriately.
Zolpidem is characterized by a rapid onset of action (approximately 15–30 minutes) and a relatively short elimination half-life (~2–3 hours in healthy adults), making it suitable for patients who require assistance with sleep initiation without prolonged CNS depression.
Pharmacokinetics
- Absorption: Rapid oral absorption with peak plasma concentrations achieved within 0.5–3 hours
- Bioavailability: Approximately 70% (due to first-pass hepatic metabolism)
- Distribution: High plasma protein binding (~92%)
- Metabolism: Extensively metabolized in the liver via CYP3A4 (primary), with contributions from CYP1A2 and CYP2D6
- Elimination Half-Life: ~2–3 hours (prolonged in elderly or hepatic impairment)
- Excretion: Primarily renal as inactive metabolites
Indications
- Short-term treatment of insomnia
- Sleep-onset insomnia (primary indication)
- May be used in transient or situational insomnia under clinical supervision
Dosage & Administration
- Adults: 5–10 mg orally immediately before bedtime
- Elderly / Hepatic impairment: Initiate at 5 mg
- Should be taken once nightly, with at least 7–8 hours available for sleep
- Extended-release formulations may be used for sleep maintenance insomnia
Contraindications
- Hypersensitivity to zolpidem or formulation components
- Severe hepatic impairment
- History of complex sleep behaviors (e.g., sleepwalking associated with zolpidem)
Adverse Effects
- Common: Dizziness, somnolence, headache, gastrointestinal disturbances
- CNS: Amnesia, confusion, hallucinations (rare)
- Behavioral: Abnormal sleep-related activities
- Risk of next-day impairment, especially with higher doses or extended-release forms
Drug Interactions
- CNS depressants: Additive sedation (opioids, benzodiazepines, alcohol)
- CYP3A4 inhibitors (e.g., ketoconazole): Increased plasma concentrations
- CYP3A4 inducers (e.g., rifampicin): Reduced efficacy
Compatibility / Suitable Use
- Adults requiring short-term pharmacologic sleep induction
- Patients with sleep-onset insomnia
- Use under strict medical supervision
- Not recommended for long-term continuous therapy