Metformin

from source

C4H11N5 · 129.16 g/mol

DMBG · dimethylbiguanide · Diaformin · Metiguanide

What is Metformin?

The first-line medicine for type 2 diabetes, descended from a compound in the goat's rue plant. It is a tiny molecule: four carbons and five nitrogens. from source

CategoryPrescription medicine

Chemical familyAmines

LeaderboardsBiggest Deadliest

Fig. 1 · 2D structure RDKit

SMILESCN(C)C(=N)N=C(N)N

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: 1,000 mg/kg · low toxicity
Species: rat
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

1,000 mg/kg · low toxicity · LD50 rat oral from source

3 more reported values

180 mg/kgLD50 · iv · mouse
300 mg/kgLD50 · other · rat
620 mg/kgLD50 · other · mouse

WarningIrritantH302, H315, H319from source

Compare with

Metformin vs Semaglutide

Sources & methodology

PubChem CID: 4091
Wikidata: Q19484
Structure: PubChem → RDKit
LD50: PubChem
Data refreshed: September 13, 2026

How MoleculeFinder sources and labels its data