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Neutrexin

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Neutrexin

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

NEUTREXIN®
(trimetrexate glucuronate) for Injection

WARNINGS

NEUTREXIN (TRIMETREXATE GLUCURONATE FOR INJECTION) MUST BE USED WITH CONCURRENT LEUCOVORIN (LEUCOVORIN PROTECTION) TO AVOID POTENTIALLY SERIOUS OR LIFE-THREATENING TOXICITIES (SEE PRECAUTIONS AND DOSAGE AND ADMINISTRATION).

DRUG DESCRIPTION

Neutrexin is the brand name for trimetrexate glucuronate. Trimetrexate, a 2,4-diaminoquinazoline, non-classical folate antagonist, is a synthetic inhibitor of the enzyme dihydrofolate reductase (DHFR). Neutrexin (trimetrexate glucuronate inj) is available as a sterile lyophilized powder, containing trimetrexate glucuronate equivalent to either 200mg or 25mg of trimetrexate without any preservatives or excipients. The powder is reconstituted prior to intravenous infusion (see DOSAGE AND ADMINISTRATION, Reconstitution And Dilution).

Trimetrexate glucuronate is chemically known as 2,4-diamino-5-methyl-6-[(3,4,5-trimethoxyanilino)methyl] quinazoline mono-D-glucuronate, and has the following structure:

NEUTREXIN® (trimetrexate glucuronate) Structural Formula Illustration

The empirical formula for trimetrexate glucuronate is C19H23N5O3•C6H10O7 with a molecular weight of 563.56. The active ingredient, trimetrexate free base, has an empirical formula of C19H23N5O3 with a molecular weight of 369.42. Trimetrexate glucuronate for injection is a pale greenish-yellow powder or cake. Trimetrexate glucuronate is soluble in water ( > 50 mg/mL), whereas trimetrexate free base is practically insoluble in water ( < 0.1 mg/mL). The pKa of trimetrexate free base in 50% methanol/water is 8.0. The logarithm10 of the partition coefficient of trimetrexate free base between octanol and water is 1.63.

Last reviewed on RxList: 4/20/2009
This monograph has been modified to include the generic and brand name in many instances.

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