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Zaleplon

Zaleplon molecule structureZaleplon molecule structure
Sonata

Dosage & Duration

Dosage

Doses are population estimates that vary widely between individuals.

Threshold~5 mg
Light10-20 mg
Moderate20-40 mg
Strong40-75 mg
Heavy75+ mg

Duration

Onset15-30 minutes
Peak1-2 hours
After Effects2-4 hours
Total3-6 hours

Subjective Effects

Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.

In controlled studies of therapeutic oral doses, zaleplon produced sedation, short-term memory impairment, and psychomotor impairment around the approximately one-hour peak exposure. In the cited studies these measured impairments were absent by 3 to 4 hours, although individual response and next-day risk vary.[cite:url-dailymed-1ef0eb]

Physical

Reported at therapeutic oral doses in the prescribing information.[cite:url-dailymed-1ef0eb]

Cognitive

Reported at therapeutic oral doses in the prescribing information; the label notes that causation for abnormal behaviour reports is often uncertain.[cite:url-dailymed-1ef0eb]

Pharmacology

Pharmacodynamics

Zaleplon interacts with the GABA-benzodiazepine receptor complex and preferentially binds the omega-1 site on alpha-1-containing GABA-A receptors. Modulation of this chloride-channel complex is associated with its hypnotic and sedative effects.citation needed

Pharmacokinetics

After oral administration, zaleplon reaches peak plasma concentration in about 1 hour and has an elimination half-life of about 1 hour. Absolute oral bioavailability is about 30% because of substantial first-pass metabolism.1 Aldehyde oxidase is the primary metabolic pathway, producing 5-oxo-zaleplon; CYP3A4 is a lesser pathway producing desethylzaleplon. The oxidative metabolites are converted to glucuronides, are pharmacologically inactive, and less than 1% of a dose is excreted unchanged in urine.1

Metabolitesnone documented yet

Interactions

Unsafe

Avoid

There is considerable risk of physical harm when taking these combinations, they should be avoided where possible.

AlcoholOther sedative-hypnotics at bedtime or during the night

Caution

Use caution

These combinations are not usually physically harmful, but may produce undesirable effects, such as physical discomfort or overstimulation. Extreme use may cause physical health issues. Synergistic effects may be unpredictable. Care should be taken when choosing to use this combination.

Opioids, benzodiazepines, tricyclic antidepressants, and other CNS depressantsCimetidineStrong CYP3A4 inducersStrong CYP3A4 inhibitors
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Tolerance

Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.

Full Tolerance
In two 28-night and one 35-night placebo-controlled studies, no tolerance to zaleplon's sleep-onset effect was observed over 4 weeks at 10 mg and 20 mg. This does not establish that tolerance cannot occur with longer use, different outcomes, or nonmedical doses.1 After discontinuation, some patients, mostly those receiving 20 mg, had mild rebound insomnia on the first night, which appeared to resolve by the second night. Available data do not provide a reliable incidence estimate for dependence at recommended doses.1

Harm Potential

Toxicity

Central Nervous System

Overdose can produce CNS depression ranging from drowsiness and confusion to ataxia, respiratory depression, coma, and very rarely death. Fatal outcomes have been reported most often when additional CNS depressants were also taken.1

History & Culture

The U.S. Food and Drug Administration approved Sonata (zaleplon) capsules under NDA 20-859 on August 13, 1999. The approved indication was short-term treatment of insomnia.2

Legality

International

As of 23 August 2026, zaleplon is not listed under the international drug-control conventions. The current INCB Yellow List covers narcotic drugs controlled under the 1961 Convention, the current Green List and its March 2026 supplement cover psychotropic substances controlled under the 1971 Convention, and the current Red List covers precursor chemicals controlled under the 1988 Convention. Complete-list searches for zaleplon, Sonata, CAS 151319-34-5, identifiers CL-284846 and HUNXMJYCHXQEGX-UHFFFAOYSA-N, and the verified chemical name found no entry or structurally applicable listing. The 2026 psychotropics supplement adds only MDMB-FUBINACA, effective 25 November 2026, and does not cover zaleplon.

By Country

Controlled / restricted7
Belgium flagBelgiumRestricted
Finland flagFinlandRestricted
Mexico flagMexicoRestricted
Norway flagNorwayRestricted
Portugal flagPortugalRestricted
Sweden flagSwedenRestricted
Switzerland flagSwitzerlandRestricted
Prescription19
United States flagUnited StatesPrescription only
Australia flagAustraliaPrescription only
Austria flagAustriaPrescription only
Brazil flagBrazilPrescription only
Canada flagCanadaPrescription only
China flagChinaPrescription only
Denmark flagDenmarkPrescription only
France flagFrancePrescription only
Germany flagGermanyPrescription only
India flagIndiaPrescription only
Ireland flagIrelandPrescription only
Italy flagItalyPrescription only
New Zealand flagNew ZealandPrescription only
Poland flagPolandPrescription only
South Africa flagSouth AfricaPrescription only
South Korea flagSouth KoreaPrescription only
Thailand flagThailandPrescription only
Ukraine flagUkrainePrescription only
United Arab Emirates flagUnited Arab EmiratesPrescription only

References

Source Pages

  1. DrugBank Article: Zaleplon Adverse Effects
  2. DrugBank Article: Zaleplon Efficacy
  3. DrugBank Article: Zaleplon for Insomnia
  4. DrugBank: Zaleplon
  5. Erowid Experience Vault: Zaleplon
  6. PsychonautWiki: Zaleplon Talk Page
  7. TripSit Wiki: Drug Combinations
  8. Wikipedia: Zaleplon

Citations

  1. Zaleplon capsules USP, Preferred Pharmaceuticals Inc.; prescribing information updated October 8, 2025. dailymed.nlm.nih.gov (n.d.). https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=b0476859-07af-47f1-aec7-61aea0d99d24123456789101112131415161718
  2. Food and Drug Administration. accessdata.fda.gov (n.d.). https://www.accessdata.fda.gov/drugsatfda_docs/nda/99/20859_Sonata_appltr_prntlbl.pdf1
  3. Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2026L00633/asmade/2026-05-28/text/original/epub/OEBPS/document_1/document_1.html1
  4. Rezeptpflichtverordnung, § 1 and Anlage 1, Teil 2 (BGBl. Nr. 475/1973, as amended by BGBl. II Nr. 282/2025). ris.bka.gv.at (n.d.). https://ris.bka.gv.at/Dokumente/Bundesnormen/NOR40273195/NOR40273195.html1
  5. Rezeptpflichtverordnung, § 1 and Anlage 1, Teil 2 (BGBl. Nr. 475/1973, as amended by BGBl. II Nr. 282/2025). ris.bka.gv.at (n.d.). https://ris.bka.gv.at/NormDokument.wxe?Abfrage=Bundesnormen&Gesetzesnummer=10010358&Paragraf=1&FassungVom=2026-08-231
  6. Loi du 25 mars 1964 sur les médicaments, art. 6quater, § 1er, 4°; arrêté royal du 14 décembre 2006 relatif aux médicaments à usage humain, art. 105. ejustice.just.fgov.be (n.d.). https://www.ejustice.just.fgov.be/eli/loi/1964/03/25/1964032508/justel1
  7. Loi du 25 mars 1964 sur les médicaments, art. 6quater, § 1er, 4°; arrêté royal du 14 décembre 2006 relatif aux médicaments à usage humain, art. 105. ejustice.just.fgov.be (n.d.). https://www.ejustice.just.fgov.be/eli/arrete/2006/12/14/2006023298/justel1
  8. Loi du 25 mars 1964 sur les médicaments, art. 6quater, § 1er, 4°; arrêté royal du 14 décembre 2006 relatif aux médicaments à usage humain, art. 105. famhp.be (n.d.). https://www.famhp.be/en/human_use/medicines/medicines/proper_use_of_medicines/questions_and_answers_on_seizure_of_postal1
  9. Loi du 25 mars 1964 sur les médicaments, art. 6quater, § 1er, 4°; arrêté royal du 14 décembre 2006 relatif aux médicaments à usage humain, art. 105. ema.europa.eu (n.d.). https://www.ema.europa.eu/en/medicines/human/EPAR/sonata123
  10. Loi du 25 mars 1964 sur les médicaments, art. 6quater, § 1er, 4°; arrêté royal du 14 décembre 2006 relatif aux médicaments à usage humain, art. 105. api.fda.gov (n.d.). https://api.fda.gov/drug/drugsfda.json?search=products.active_ingredients.name%3AZALEPLON&limit=1001

Further Reading

  1. StatPearls: Zaleplon
  2. Zaleplon: A pyrazolopyrimidine sedative-hypnotic agent (2000)

Article Status

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    Step 1 · Automated synthesis

    An autonomous workflow built by Josie Kins compiled this article's foundation from information published across the web.

  • Step 2 · First-pass reviewPending

    Not yet reviewed — this article is pending editorial review by Lyrea.

  • Step 3 · Citation reviewPending

    No one has reviewed this article's citations yet. That second pass checks each claim against the source it cites.

Recent changes7 human edits · latest

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24 January 2026

  1. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  2. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  3. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  4. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  5. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  6. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  7. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

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