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Raltitrexed ball-and-stick.png
Systematic (IUPAC) name
N-[(5-{methyl[(2-methyl-4-oxo-1,4-dihydroquinazolin-6-yl)methyl]amino}-2-thienyl)carbonyl]-L-glutamic acid
CAS number 112887-68-0
ATC code L01BA03
PubChem 104758
DrugBank DB00293
Chemical data
Formula C21H22N4O6S 
Mol. mass 458.489 g/mol
SMILES eMolecules & PubChem
Pharmacokinetic data
Bioavailability ?
Metabolism ?
Half life ?
Excretion ?
Therapeutic considerations
Pregnancy cat.


Legal status

POM(UK) Not available in U.S.

Routes Intravenous

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Raltitrexed (brand name Tomudex®) is a chemotherapy drug manufactured AstraZeneca Company, is an antimetabolite used in chemotherapy. It is an inhibitor of thymidylate synthase.


Used in treatment of colorectal cancer since 1998.

Mechanism of action

Raltitrexed is chemically similar to folic acid and is in the class of chemotherapy drugs called folate antimetabolites. It works by inhibiting enzyme used in pyrimidine synthesis —thymidylate synthase (TS). Raltitrexed is fully active after polyglutamylation. Inhibition of L1210 cell growth i culture IC50 = 9 nM, is one of the strongest antimetabolite in use. By inhibiting the formation of precursor pyrimidine nucleotides, raltitrexed prevents the formation of DNA and RNA, which are required for the growth and survival of both normal cells and cancer cells.