Lorazepam

from source

C15H10Cl2N2O2 · 321.2 g/mol

Ativan · Lormetazepam · O-Chlorooxazepam · O-Chloroxazepam

What is Lorazepam?

The benzodiazepine sold as Ativan, used for anxiety, seizures and sedation before procedures. Lorazepam (C15H10Cl2N2O2, 321 g/mol) is a benzodiazepine dispensed on prescription. from source

CategoryPrescription medicine

Chemical familyAlcohols Aromatics Amides Halogenated

LeaderboardsBiggest Deadliest

Fig. 1 · 2D structure RDKit

SMILESC1=CC=C(C(=C1)C2=NC(C(=O)NC3=C2C=C(C=C3)Cl)O)Cl

Where you'll find it

Dispensed on prescription, not sold on a shelf. See the rest of the prescription medicine group.

Relative acute toxicity from source

Animal study data · LD50

Reported LD50: 3,178 mg/kg · very low toxicity
Species: mouse
Route: oral

An LD50 describes acute toxicity under experimental conditions and is not a safe or dangerous dose for a person.

Toxicity & hazards

Toxicity · LD50

3,178 mg/kg · very low toxicity · LD50 mouse oral from source

WarningHealth hazardH361from source

Keep roaming

Where Lorazepam leads

Compare with

Lorazepam vs Diazepam

Sources & methodology

PubChem CID: 3958
Wikidata: Q408265
Structure: PubChem → RDKit
LD50: PubChem
Similar molecules: MoleculeFinder fingerprint similarity
Data refreshed: September 13, 2026

How MoleculeFinder sources and labels its data