Ambien (zolpidem): uses, dosage, side effects and refills

Zolpidem is the most prescribed sleep medicine in the US. ClinCalc ranks it 55th among all drugs in 2024, at roughly 12.7 million prescriptions, slightly ahead of alprazolam.

It is not a benzodiazepine, though it works on the same receptor. Chemically it is an imidazopyridine, and the label describes it as a GABA-A receptor positive modulator that prefers receptors containing the α1 subunit, the subtype most linked to sedation. It has no meaningful binding at α5 subunits, which may explain why it shows little muscle-relaxant effect in animal studies (Ambien label 12.2). Drugs in this group are often called "Z-drugs."

Its defining trait is a short half-life, about 2.5 hours in healthy adults. That makes it good at getting people to sleep and less likely to linger, but next-morning impairment still happens, especially at higher doses and in women.

Forms include Ambien (5 and 10 mg), Ambien CR (6.25 and 12.5 mg, extended-release), Edluar (5 and 10 mg tablets that dissolve under the tongue), and generic 1.75 mg and 3.5 mg sublingual tablets for waking in the middle of the night. Ambien is now marketed by Cosette Pharmaceuticals.

FDA-labeled uses

• Ambien and Edluar: short-term treatment of insomnia characterized by difficulty with sleep initiation. Ambien shortened the time to fall asleep for up to 35 days in controlled studies; the efficacy trials lasted 4 to 5 weeks (Ambien label 1, 14).
• Ambien CR: short-term treatment of insomnia with difficulty falling asleep and/or staying asleep, measured as wake time after sleep onset (Ambien CR label 1).
• Zolpidem 1.75 mg and 3.5 mg sublingual tablets: as-needed treatment when a middle-of-the-night awakening is followed by difficulty returning to sleep. They are not for use with fewer than 4 hours left before the planned wake time (sublingual zolpidem label).

Important limits

• The label says to re-evaluate if insomnia does not improve after 7 to 10 days, because sleep problems can be the first sign of a physical or psychiatric disorder (Ambien label 5.3).
• Long-term use is not recommended; treatment should be as short as possible (Ambien label 2.1).
• Not for children. In an 8-week study of children aged 6 to 17 with ADHD-related insomnia, zolpidem did not shorten time to sleep, and 7% had hallucinations (Ambien label 8.4).

MedlinePlus notes that zolpidem may not work as well after about 2 weeks of nightly use. It is not approved for anxiety or for any daytime use.

Zolpidem binds the benzodiazepine site on α1-containing GABA-A receptors and increases how often their chloride channels open, which damps the firing of brain cells and brings on sleep (Ambien label 12.1). It has little affinity for dopamine, serotonin, adrenergic, histamine or muscarinic receptors.

Pharmacokinetics (Ambien label 12.3):

• Peak level about 1.6 hours after a 5 mg or 10 mg tablet on an empty stomach.
• Half-life about 2.5 hours (range 1.4 to 4.5).
• Protein binding 92.5%.
• Elimination: converted to inactive metabolites, cleared mainly by the kidneys.
• Food: taken 20 minutes after a meal, exposure fell 15%, peak level 25%, and time to peak lengthened by 60%.

Women clear zolpidem more slowly: at the same dose, peak levels and total exposure were about 45% higher than in men (label 8.6). That finding is why the recommended starting dose for women is 5 mg.

Liver disease has a large effect: in cirrhosis, total exposure was five times higher and half-life averaged 9.9 hours.

Do not take zolpidem if you (Ambien label 4):

• Have ever had a complex sleep behavior after taking it, such as sleep-walking or sleep-driving.
• Have had an allergic reaction to zolpidem, including anaphylaxis or angioedema.

Tell your prescriber about:

• Opioids, benzodiazepines, other sleep aids or alcohol use. Combining CNS depressants raises the risk of next-day impairment and slowed breathing.
• Sleep apnea or lung disease. In mild to moderate sleep apnea, zolpidem lowered oxygen saturation compared with placebo (label 5.7).
• Liver disease. Severe impairment means avoiding zolpidem, since it can trigger hepatic encephalopathy.
• Depression or suicidal thoughts; sedative-hypnotics can worsen them (label 5.6).
• Past drug or alcohol misuse, which increases dependence risk (label 9.3).
• Age 65 or older, where 5 mg is the dose for both sexes.
• Medicines that change zolpidem levels: rifampin, St. John's wort, ketoconazole, sertraline, fluvoxamine or ciprofloxacin.
• Pregnancy or breastfeeding.

A useful question for your prescriber: "What is our plan if my insomnia lasts beyond 7 to 10 days, and have we looked for a cause?"

• Take it immediately before bed, only once a night, and only when you have 7 to 8 hours left before you need to be up (Ambien label 2.1). Do not take another dose that same night.
• Take it on an empty stomach for the quickest effect. Taking it with or soon after a meal slows it down (label 2.4; MedlinePlus).
• Ambien CR: swallow whole; do not split, crush or chew it (Ambien CR label).
• Edluar: peel the paper layer, push the tablet through the foil, place it under your tongue and let it dissolve; do not swallow it whole or take it with water (MedlinePlus).
• Middle-of-the-night sublingual tablets: take only in bed after waking, and only with at least 4 hours left before you must get up.
• Expect sleepiness quickly and get straight into bed. Getting up too soon can cause memory and coordination problems (MedlinePlus).
• Skip it after drinking alcohol or taking other sedatives.
• Morning: do not drive or do anything needing full alertness if you feel any drowsiness.

If you, or someone who lives with you, notice you did something during the night without remembering it, stop taking zolpidem and call your prescriber (label 5.1).

Your prescriber chooses the dose and the length of treatment. The table summarizes the labels.

• Start low: the label says to use the lowest effective dose, never above 10 mg of immediate-release zolpidem a night. At 10 mg, higher morning blood levels raise the risk of impaired driving the next day.
• Older adults: 5 mg regardless of sex. In non-US trials, most falls and confusion in people 70 and over occurred at doses above 10 mg (label 8.5).
• Liver: 5 mg for mild to moderate impairment; avoid in severe impairment.
• Kidneys: the label gives no specific adjustment.
• Other depressants: dose reductions of zolpidem or the other drug may be needed (label 2.3).
• Duration: as short as possible; extended use needs re-evaluation because dependence risk grows with dose and time.
• Stopping after nightly use: do not stop abruptly without talking to your prescriber, especially after more than 2 weeks (MedlinePlus). Your prescriber plans any reduction.

Zolpidem is taken as needed, not on a fixed schedule. MedlinePlus says you may take it later than usual only if you can still remain in bed for the required time: 7 to 8 hours for standard and extended-release tablets, or 4 hours for the middle-of-the-night sublingual tablet. Otherwise skip it. Never take a second dose the same night.

In zolpidem overdose, consciousness can fall from drowsiness to coma, and breathing and heart function can be compromised; deaths have been reported, alone or with other depressants (Ambien label 10.1). Call 911 if someone cannot be woken or is breathing poorly. For guidance on a suspected overdose, call Poison Help at 1-800-222-1222.

• Alcohol at any point that evening. It worsens psychomotor impairment (label 7.1).
• Taking it with less than a full night's sleep ahead.
• Other sleep medicines, including other zolpidem products, at bedtime or during the night (label 5.2).
• Opioids and benzodiazepines unless your prescriber has planned the combination.
• St. John's wort and rifampin, which can make zolpidem less effective.
• Driving the next morning if you feel even slightly drowsy.
• Taking it with or right after a meal, which delays its effect.

Pregnancy. Published data have not shown a clear association between zolpidem and major birth defects (Ambien label 8.1). Zolpidem crosses the placenta, and newborns exposed late in the third trimester have had respiratory depression and sedation; some required ventilation or intubation, and most recovered within hours to weeks. Tell your prescriber if you are pregnant or planning pregnancy.

Breastfeeding. Small amounts reach breast milk, and excess sedation has been reported in infants. The label says exposed infants should be watched for sedation, low muscle tone and breathing problems, and that a nursing parent may pump and discard milk during treatment and for 23 hours (about five half-lives) after a dose to minimize exposure (label 8.2).

Per section 16 of the Ambien label, keep the tablets between 68°F and 77°F (20°C–25°C). Keep sublingual tablets in their blister or pouch until use. Keep zolpidem locked away from children and others. Dispose of unused tablets through a take-back program or as your pharmacist advises.

Generic zolpidem is inexpensive; brand Ambien costs dozens of times more. SingleCare's zolpidem tartrate page for 30 tablets of 10 mg showed on 6 Oct 2026:

• Lowest coupon price: $11.67.
• Average monthly retail cash prices: $58.50 at Kroger, $62.70 at CVS, $65.13 at Walgreens and $71.34 at Walmart.
• Coupon average at CVS: $19.31.
• Brand Ambien: $833.85 at Walgreens and $837.00 at CVS.

(SingleCare zolpidem tartrate page, checked 6 Oct 2026.) Mark Cuban Cost Plus Drugs showed nothing for zolpidem in its price API on that date; controlled medicines are outside its catalog. Extended-release and sublingual generics are priced separately; ask for a quote, and check your plan's formulary.

• Temazepam (Restoril): a benzodiazepine hypnotic for short-term insomnia.
• Trazodone: an antidepressant with sedating effects and no DEA schedule.
• Melatonin: a hormone supplement sold without a prescription.
• Mirtazapine: an antidepressant with sedating effects.
• Diphenhydramine: the antihistamine in many OTC sleep aids.
• Lorazepam (Ativan): a benzodiazepine whose label includes bedtime use for anxiety-related insomnia.
• Quetiapine: an antipsychotic with sedating effects, approved for psychiatric conditions rather than insomnia.