DL-α-Difluoromethylornithine hydrochloride hydrate

solid, ≥97% (NMR)

2-(Difluoromethyl)ornithine hydrochloride hydrate, Eflornithine hydrochloride hydrate, DFMO hydrochloride hydrate
Empirical Formula (Hill Notation):
C6H12F2N2O2 · xHCl · yH2O
Molecular Weight:
182.17 (anhydrous free base basis)
MDL number:
PubChem Substance ID:

Quality Level


≥97% (NMR)






DMSO: >10 mg/mL
H2O: >10 mg/mL

SMILES string




InChI key


Gene Information

human ... ODC1(4953)

General description

Difluoromethylornithine is a fluorinated ornithine analog, which acts as a rate-limiting enzyme of polyamine biosynthesis. It is used to treat female facial hirsutism and human African trypanosomiasis. Difluoromethylornithine functions as a chemopreventive and chemotherapeutic agent against neuroblastoma and colorectal cancer. It exhibits cytostatic effects on mammalian cells and tissues.


DL-α-Difluoromethylornithine hydrochloride hydrate has been used to reduce the effects of arginine on cell proliferation. It has also been used to investigate the effect of bisphenol A (BPA) on the migration of an established ovine trophectoderm (oTr1) cell line.


25, 100 mg in poly bottle

Biochem/physiol Actions

Difluoromethylornithine (Eflornithine) inhibits polyamine biosynthesis by the selective, irreversible inhibition of ornithine decarboxylase (ODC). A chemoprotective agent that blocks angiogenesis.

Features and Benefits

This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
Preeti et al.
PloS one, 8(1), e53397-e53397 (2013-01-18)
Polyamine biosynthetic pathway is a validated therapeutic target for large number of infectious diseases including cancer, giardiasis and African sleeping sickness, etc. α-Difluoromethylornithine (DFMO), a potent drug used for the treatment of African sleeping sickness is an irreversible inhibitor of...
Joanne M Jeter et al.
Cancer prevention research (Philadelphia, Pa.), 5(12), 1341-1344 (2012-12-12)
In this issue (beginning on page 1368), Kreul and colleagues report a retrospective review of long-term efficacy and toxicity for subjects participating in a phase III study of difluoromethylornithine (DFMO) for prevention of nonmelanoma skin cancer (NMSC). They conclude that...
Functional roles of arginine during the peri-implantation period of pregnancy. III. Arginine stimulates proliferation and interferon tau production by ovine trophectoderm cells via nitric oxide and polyamine-TSC2-MTOR signaling pathways
Wang X, et al.
Biology of Reproduction, 92(3), 75-71 (2015)
Development of difluoromethylornithine (DFMO) as a chemoprevention agent
Meyskens FL and Gerner EW
Clinical Cancer Research, 5(5), 945-951 (1999)
Alpha-difluoromethylornithine, an irreversible inhibitor of polyamine biosynthesis, as a therapeutic strategy against hyperproliferative and infectious diseases
LoGiudice N, et al.
Medical sciences (Basel, Switzerland), 6(1), 12-12 (2018)
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