moleculefinder

Clonazepam

C15H10ClN3O3315.71 g/mol Calculated

Also called Klonopin, Iktorivil, Ravotril and Rivatril.

The benzodiazepine sold as Klonopin, used for seizure disorders and panic disorder. It is long-acting compared with most of its class.

Sources and notes
  • The introductionfrom sourceMoleculeFinder curated
  • Other namesfrom sourcePubChem / Wikidata
  • Formula and weightcomputedPubChem
  • 2D drawingcomputedPubChem structure, drawn by RDKit
  • 3D modelfrom sourcePubChem 3D conformerLoaded after the page has painted, and on a phone only when you ask for it; the 2D drawing shows until it arrives.

Where you encounter it

Dispensed on prescription, not sold on a shelf. Clonazepam on the product labels we hold.

Medicines

KlonopinAdded by the makerActive ingredient

Every product and list we hold

Sources and notes
  • The product labels and their strengthsfrom sourceDailyMed (FDA label)Each label lists the molecule as an ingredient, and an active ingredient at the strength shown.
  • How it gets therefrom sourceMoleculeFinder curatedEach mark is set by hand on our lists, never inferred; a label's ingredient is added by the maker. A row with no mark data says Not marked.
  • The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.

Explore its structure

Choose a part to light it up.

A C=O bonded to a nitrogen, the same link that joins amino acids in a protein. It is sturdy, and its nitrogen is not a base the way an amine's is.

From: standard chemistry.

Sources and notes
  • The drawingcomputedPubChem structure, drawn by RDKitThe page's one shipped drawing, with the chosen part lit in amber under it.
  • The partscomputedFound by ruleEach part is found by a chemical pattern, never picked by hand atom by atom; its words say where they come from.

Compare a related molecule

Clonazepam

Alprazolam

Clonazepam lasts far longer than alprazolam, a half-life of 30 to 40 hours against about 11, so it is used for seizures and alprazolam for acute episodes.

Clonazepam vs Alprazolam, side by side
Sources and notes
  • The sentencefrom sourceMoleculeFinder comparison notesThe pair's answer line.
  • The two drawingscomputedPubChem structures, drawn by RDKitThe two drawings side by side.

Properties and sources

Calculated by PubChem

Molecular formula
C15H10ClN3O3
Molecular weight
315.71 g/mol
XLogP3octanol/water, log units
2.4
Polar surface areatopological
87.3 Ų
H-bond donors
1
H-bond acceptors
4
Rotatable bonds
1
Complexity
491

Measured LD50, HSDB via PubChem

15,000 mg/kg pure clonazepam, rat, oral

An LD50 is an animal study measurement, not a dose for a person.

Reported Hazard label (GHS), ECHA via PubChem

Danger Irritant pictogram (GHS07) and Health hazard pictogram (GHS08); hazard statements H336, H360, H361, H362, H412, H413

Reported Licence

The US Food and Drug Administration licenses Clonazepam for human use (NDA 017533, authorized June 4, 1975), as Klonopin. Drugs@FDA

Groups it belongs to

Category
Prescription medicine
Family
Benzodiazepines
Chemical groups
Aromatics, Amides, Halogenated
Elements
Chlorine, Nitrogen
Hazard classes
Irritant, Health hazard, GHS Danger
SMILESC1C(=O)NC2=C(C=C(C=C2)[N+](=O)[O-])C(=N1)C3=CC=CC=C3Cl

PubChem CID 2802 · Wikidata Q407988 · InChIKey DGBIGWXXNGSACT-UHFFFAOYSA-N · Data refreshed

How MoleculeFinder sources and labels its data

Questions
What is Clonazepam?
The benzodiazepine sold as Klonopin, used for seizure disorders and panic disorder. It is long-acting compared with most of its class.
How toxic is Clonazepam?
The reported LD50 of Clonazepam is 15,000 mg/kg (rat, oral). An LD50 is an animal study measurement, not a dose for a person. Its GHS hazard label carries the signal word Danger and the hazard pictograms Irritant and Health hazard. from sourcefrom source
What kind of molecule is Clonazepam?
Clonazepam has the formula C15H10ClN3O3 and a molecular weight of 315.71 g/mol. MoleculeFinder files it under benzodiazepines, in the prescription medicine group. from sourcefrom sourcefrom sourcefrom source
Who licenses Clonazepam as a medicine?
The US Food and Drug Administration licenses Clonazepam for human use (NDA 017533, authorized June 4, 1975), as Klonopin. from source
Sources and notes
  • Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
  • LD50from sourceHSDB via PubChemOther values the sources report: mouse, oral, 2,000 mg/kg; mouse, another route, 13,300 mg/kg; rat, another route, 14,200 mg/kg. The page shows the one LD50 the site uses everywhere.
  • Hazard labelfrom sourceECHA via PubChemThe label combines these classifications.
  • ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
  • Licencefrom sourceDrugs@FDARead 2026-10-21.
  • Data refreshedfrom sourceMoleculeFinder2026-11-09

Keep exploring

Compared side by side with clonazepamAlprazolamC17H13ClN4Also a benzodiazepineNitrazepamC15H11N3O3Also a benzodiazepineFlunitrazepamC16H12FN3O3Also a benzodiazepineBromazepamC14H10BrN3O
More related molecules
Sources and notes
  • Compared side by sidefrom sourceMoleculeFinder comparison notesA molecule we compare it with on its own page.
  • The same kind of moleculefrom sourceMoleculeFinder curated groupsA structural neighbour in the same family or type group; the line names the group in its own words.
  • The drawingscomputedPubChem structures, drawn by RDKit