Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Duration
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
Unsafe
AvoidThere is considerable risk of physical harm when taking these combinations, they should be avoided where possible.
Caution
Use cautionThese 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.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
Harm Potential
Toxicity
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
References
Source Pages
Citations
- 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
- Food and Drug Administration. accessdata.fda.gov (n.d.). https://www.accessdata.fda.gov/drugsatfda_docs/nda/99/20859_Sonata_appltr_prntlbl.pdf1
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
Article Status
Step 1 · Automated synthesisAn 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
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
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