PLATINEX CONCENTRATE FOR SOLUTION FOR INFUSION 50MG/10ML

Oxaliplatin

Source of information: Drugbank (External Link). Last updated on: 3rd July 18
*Trade Name used in the content below may not be the same as the HSA-registered product.

Active Ingredient / Synonyms

Diaminocyclohexane Oxalatoplatinum | L-OHP | Oxalatoplatin | Oxalatoplatinum | oxaliplatine | oxaliplatino | oxaliplatinum | Oxaliplatin |

Description

Oxaliplatin is a platinum-based chemotherapy drug in the same family as cisplatin and carboplatin. It is typically administered in combination with fluorouracil and leucovorin in a combination known as Folfox for the treatment of colorectal cancer. Compared to cisplatin the two amine groups are replaced by cyclohexyldiamine for improved antitumour activity. The chlorine ligands are replaced by the oxalato bidentate derived from oxalic acid in order to improve water solubility. Oxaliplatin is marketed by Sanofi-Aventis under the trademark Eloxatin®.

Indication

Used in combination with infusional 5-FU/LV, is indicated for the treatment of advanced carcinoma of the colon or rectum and for adjuvant treatment of stage III colon cancer patients who have undergone complete resection of the primary tumor.

Mechanism of Action

Oxaliplatin undergoes nonenzymatic conversion to active derivatives via displacement of the labile oxalate ligand. Several transient reactive species are formed, including monoaquo and diaquo DACH platinum, which covalently bind with macromolecules. After activation, oxaliplatin binds preferentially to the guanine and cytosine moieties of DNA, leading to cross-linking of DNA, thus inhibiting DNA synthesis and transcription. Cytotoxicity is cell-cycle nonspecific.

Pharmacodynamics

Oxaliplatin selectively inhibits the synthesis of deoxyribonucleic acid (DNA). The guanine and cytosine content correlates with the degree of Oxaliplatin-induced cross-linking. At high concentrations of the drug, cellular RNA and protein synthesis are also suppressed.

Pharmacokinetics

Absorption:

Bioavailability is complete following intravenous administration. When a single 2-hour intravenous infusion of oxaliplatin at a dose of 85 mg/m^2 is given, the peak serum concentration was 0.814 mcg/mL.

Distribution:

* 440 L [single 2-hour IV infusion at dose of 85 mg/m^2] At the end of a 2-hour infusion of oxaliplatin, approximately 15% of the administered platinum is present in the systemic circulation. The remaining 85% is rapidly distributed into tissues or eliminated in the urine.

Metabolism:

Oxaliplatin undergoes nonenzymatic conversion in physiologic solutions to active derivatives via displacement of the labile oxalate ligand. Several transient reactive species are formed, including monoaquo and diaquo DACH platinum, which covalently bind with macromolecules. There is no evidence of cytochrome P450-mediated metabolism in vitro.

Elimination:

The major route of platinum elimination is renal excretion. At five days after a single 2-hour infusion of oxaliplatin, urinary elimination accounted for about 54% of the platinum eliminated, with fecal excretion accounting for only about 2%.

Half-life

The decline of ultrafilterable platinum levels following oxaliplatin administartion is triphasic, with two distribution phases: t1/2α; 0.43 hours and t1/2β; 16.8 hours. This is followed by a long terminal elimination phase that lasts 391 hours (t1/2γ).

Clearance

* 10 - 17 L/h [renal clearance]

Toxicity

There have been five cases of oxaliplatin overdose reported. One patient received two 130 mg/m2 doses of oxaliplatin (cumulative dose of 260 mg/m2) within a 24-hour period. The patient experienced Grade 4 thrombocytopenia (<25,000/mm3) without any bleeding, which resolved. Two other patients were mistakenly administered oxaliplatin instead of carboplatin. One patient received a total oxaliplatin dose of 500 mg and the other received 650 mg. The first patient experienced dyspnea, wheezing, paresthesia, profuse vomiting and chest pain on the day of administration. She developed respiratory failure and severe bradycardia, and subsequently did not respond to resuscitation efforts. The other patient also experienced dyspnea, wheezing, paresthesia, and vomiting. Most common adverse reactions (incidence ≥ 40%) were peripheral sensory neuropathy, neutropenia, thrombocytopenia, anemia, nausea, increase in transaminases and alkaline phosphatase, diarrhea, emesis, fatigue and stomatitis.

References

  1. Health Science Authority of Singapore - Reclassified POM
  2. Drugbank

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Approval Information

PLATINEX CONCENTRATE FOR SOLUTION FOR INFUSION 50MG/10ML was registered with Health Science Authority of Singapore by PHARMAKOE PTE LTD. It is marketed with the registration number of SIN15708P with effective from 2019-06-04.

This product contains 5mg/ml of Oxaliplatin in the form of INJECTION, SOLUTION, CONCENTRATE.

The medicine was manufactured by GENEPHARM S.A in GREECE

It is a Presciption Only Medicine which can only be obtained from a doctor or a dentist, or from a pharmacist with a prescription from a Singapore-registered doctor or dentist.

Anatomical Therapeutic Chemical (ATC) Classification

ATC Code: L01XA03

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