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TRIMETHOPRIM
 
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  •   Chemical Component Summary   Hide
    Name TRIMETHOPRIM
    Identifiers 5-(3,4,5-trimethoxybenzyl)pyrimidine-2,4-diamine
    5-[(3,4,5-trimethoxyphenyl)methyl]pyrimidine-2,4-diamine
    Formula C14 H18 N4 O3
    Molecular Weight 290.32 g/mol
    Type non-polymer
    Isomeric SMILES
    InChI
    InChI key IEDVJHCEMCRBQM-UHFFFAOYSA-N
     
  •   Drug Info: DrugBank Hide
    DrugBank ID DB00440   (Stereoisomeric match)
    Name Trimethoprim
    Groups approved
    Description A pyrimidine inhibitor of dihydrofolate reductase, it is an antibacterial related to pyrimethamine. The interference with folic acid metabolism may cause a depression of hematopoiesis. It is potentiated by sulfonamides and the trimethoprim-sulfamethoxazole combination is the form most often used. It is sometimes used alone as an antimalarial. Trimethoprim resistance has been reported. [PubChem]
    Synonyms
    • 2,4-Diamino-5-(3,4,5-trimethoxybenzyl)pyrimidine
    • 5-[(3,4,5-Trimethoxyphenyl)methyl]-2,4-pyrimidinediamine
    • Proloprim
    • Trimethoprim
    • Triméthoprime
    • Trimethoprimum
    • Trimetoprima
    • Trimpex
    [more]
    Brand names
    • Alprim
    • Catin
    • Eumi
    • Inflamnil
    • Lannacher
    • Lariago
    • Meprim
    • Metipine
    • Monotrim
    • Motrim
    • Primsol
    • Proloprim
    • Trimpex
    • Triprim
    [more]
    Affected organism Gram negative and gram positive bacteria
    Indication For the treatment of urinary tract infections, uncomplicated pyelonephritis (with sulfamethoxazole) and mild acute prostatitis. May be used as pericoital (with sulfamethoxazole) or continuous prophylaxis in females with recurrent cystitis. May be used as an alternative to treat asymptomatic bacteriuria during pregnancy (only before the last 6 weeks of pregnancy). Other uses include: alternative agent in respiratory tract infections (otitis, sinusitus, bronchitis and pneumonia), treatment of Pneumocystis jirovecii pneumonia (acute or prophylaxis), Nocardia infections, and traveller's diarrhea.
    Pharmacology Trimethoprim is a pyrimidine analogue that disrupts folate synthesis, an essential part of the thymidine synthesis pathway. Inhibition of the enzyme starves the bacteria of nucleotides necessary for DNA replication.The drug, therefore, exhibits bactericidal activity.
    Mechanism of action Trimethoprim binds to dihydrofolate reductase and inhibits the reduction of dihydrofolic acid (DHF) to tetrahydrofolic acid (THF). THF is an essential precursor in the thymidine synthesis pathway and interference with this pathway inhibits bacterial DNA synthesis. Trimethoprim's affinity for bacterial dihydrofolate reductase is several thousand times greater than its affinity for human dihydrofolate reductase. Sulfamethoxazole inhibits dihydrofolate synthetase (aka dihydropteroate synthetase), an enzyme involved further upstream in the same pathway. Trimethoprim and sulfamethoxazole are commonly used in combination due to their synergistic effects. This drug combination also reduces the development of resistance that is seen when either drug is used alone.
    Route of administration Oral
    Categories Anti-Infective Agents
    ATC-Code J01EA01
    AHFS-Code 08:36.00
    CAS number 738-70-5
    Targets
    Name Sequence search Pharmacological action Actions
    Thymidylate synthase   Search  yes inhibitor
    Dihydrofolate reductase   Search  no inhibitor
     
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