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GEO: Full Drug Profile

Medically reviewed by Min Clinic Staff | Updated: January 2026

GEO - General Information

GEO is a nucleoside analog used as chemotherapy. It is marketed as Gemzar® by Eli Lilly and Company. As with fluorouracil and other analogues of pyrimidines, the drug replaces one of the building blocks of nucleic acids, in this case cytidine, during DNA replication. The process arrests tumor growth, as new nucleosides cannot be attached to the "faulty" nucleoside, resulting in apoptosis (cellular "suicide").
GEO is used in various carcinomas: non-small cell lung cancer, pancreatic cancer, bladder cancer and breast cancer. It is being investigated for use in oesophageal cancer, and is used experimentally in lymphomas and various other tumor types.

 

Pharmacology of GEO

GEO is an antineoplastic anti-metabolite. Anti-metabolites masquerade as purine or pyrimidine - which become the building blocks of DNA. They prevent these substances becoming incorporated in to DNA during the "S" phase (or DNA synthesis phase of the cell cycle), stopping normal development and division. GEO blocks an enzyme which converts the cytosine nucleotide into the deoxy derivative. In addition, DNA synthesis is further inhibited because GEO blocks the incorporation of the thymidine nucleotide into the DNA strand.

 

GEO for patients

General �� Patients receiving therapy with Gemzar should be monitored closely by a physician
experienced in the use of cancer chemotherapeutic agents. Most adverse events are reversible and
do not need to result in discontinuation, although doses may need to be withheld or reduced.
There was a greater tendency in women, especially older women, not to proceed to the next
cycle.

Laboratory Tests �� Patients receiving Gemzar should be monitored prior to each dose with a
complete blood count (CBC), including differential and platelet count. Suspension or
modification of therapy should be considered when marrow suppression is detected.

 

GEO Interactions

No specific drug interaction studies have been conducted. For information on the pharmacokinetics of Gemzar and cisplatin in combination, see Drug Interactions under CLINICAL PHARMACOLOGY section.

 

GEO Contraindications

Gemzar is contraindicated in those patients with a known hypersensitivity to the drug (see Allergic under ADVERSE REACTIONS).

 

Additional information about GEO

GEO Indication

For the first-line treatment of patients with metastatic breast cancer, locally advanced (Stage IIIA or IIIB), or metastatic (Stage IV) non-small cell lung cancer and as first-line treatment for patients with adenocarcinoma of the pancreas.

Mechanism Of Action
GEO inhibits thymidylate synthetase, leading to inhibition of DNA synthesis and cell death. GEO is a prodrug so activity occurs as a result of intracellular conversion to two active metabolites, gemcitabine diphosphate and gemcitabine triphosphate by deoxycitidine kinase. GEO diphosphate inhibits ribonucleotide reductase, the enzyme responsible for catalyzing synthesis of deoxynucleoside triphosphates required for DNA synthesis. GEO triphosphate (diflurorodeoxycytidine triphosphate) competes with endogenous deoxynucleoside triphosphates for incorporation into DNA.
Drug Interactions
Anisindione The agent increases the effect of anticoagulant
Generic Name
Gemcitabine
Drug Category
Radiation-Sensitizing Agents; Immunosuppressive Agents; Antimetabolites; Antineoplastic Agents; Antiviral Agents
Drug Type
Small Molecule; Approved
Other Brand Names containing Gemcitabine
DDFC; DFDC; GEO; Gemcin; Gemcitabina [Inn-Spanish]; Gemcitabine HCl; Gemcitabine hydrochloride; Gemcitabinum [Inn-Latin]; Gemtro; Gemzar;
Absorption
100%
Toxicity (Overdose)
Myelosuppression, paresthesias, and severe rash were the principal toxicities, LD50=500 mg/kg (orally in mice and rats)
Protein Binding
Plasma protein binding is negligible (<10%)
Biotransformation
Transformed via nucleoside kinases to two active metabolites, gemcitabine diphosphate and gemcitabine triphosphate. Can also undergo deamination via cytidine deaminase to an inactive uracil metabolite (dFdU).
Half Life
Short infusions ranged from 32 to 94 minutes, and the value for long infusions vary from 245 to 638 minutes, depending on age and gender.
Dosage Forms of GEO
Powder, for solution Intravenous
Chemical IUPAC Name
4-amino-1-[(2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one
Chemical Formula
C9H11F2N3O4
Organisms Affected
Humans and other mammals