Chemical Component Summary

Identifiers 5-(3,4,5-trimethoxybenzyl)pyrimidine-2,4-diamine
Formula C14 H18 N4 O3
Molecular Weight 290.32 g/mol
Type non-polymer
Isomeric SMILES COc1cc(Cc2cnc(N)nc2N)cc(OC)c1OC
InChI InChI=1S/C14H18N4O3/c1-19-10-5-8(6-11(20-2)12(10)21-3)4-9-7-17-14(16)18-13(9)15/h5-7H,4H2,1-3H3,(H4,15,16,17,18)

Chemical Details

Formal Charge 0
Atom Count 39
Chiral Atom Count 0
Chiral Atoms
Bond Count 40
Aromatic Bond Count 12

Drug Info: DrugBank

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]
  • 2,4-Diamino-5-(3,4,5-trimethoxybenzyl)pyrimidine
  • 5-[(3,4,5-Trimethoxyphenyl)methyl]-2,4-pyrimidinediamine
  • Proloprim
  • Trimethoprim
  • Triméthoprime
  • Trimethoprimum
  • Trimetoprima
  • Trimpex
  • Trimethoprim hydrochloride
  • Trimethoprim sulfate
Brand Names
  • Apo Sulfatrim DS Tab
  • Apo Sulfatrim Pediatric
  • Apo Sulfatrim Tab
  • Apo-sulfatrim Oral Sus
  • Bactrim
  • Bactrim DS
  • Bactrim DS Roche Tab
  • Bactrim Roche Inj
  • Bactrim Roche Suspension Paediatric
  • Bactrim Roche Tab
  • Coptin Oral Suspension
  • Coptin Tab
  • Nu-cotrimox Sus 40/8mg/ml
  • Nu-cotrimox Tab 400/80mg
  • Nu-cotrimox-DS Tab 800/160mg
  • PMS-polytrimethoprim
  • Polymyxin B Sulfate and Trimethoprim
  • Polymyxin B Sulfate and Trimethoprim Sulfate
  • Polytrim
  • Polytrim Ophthalmic Solution
  • Primsol
  • Proloprim 200 Tab 200mg
  • Proloprim Tab 100mg
  • Protrin Df Tab
  • Protrin Tab
  • Riva-sep DS
  • Roubac Tab 160/800
  • Roubac Tab 80/400
  • Sandoz Polytrimethoprim
  • Septra
  • Septra DS Tablets
  • Septra Injection
  • Septra Pediatric Suspension
  • Sulfamethoxazole and Trimethoprim
  • Sulfamethoxazole and Trimethoprim (double Strength)
  • Sulfamethoxazole and Trimethoprim DS
  • Sulfamethoxazole and Trimethoprim Double Strength
  • Sulfamethoxazole and Trimethoprim Tablets
  • Sulfatrim
  • Teva-trimel
  • Teva-trimel DS
  • Trimethoprim
  • Trimethoprim Sulfate and Polymyxin B Sulfate
  • Trimethoprim Tablets
  • Trisulfa DS Tab
  • Trisulfa S Suspension
  • Trisulfa Tab
  • Alprim
  • Catin
  • Eumi
  • Inflamnil
  • Lannacher
  • Lariago
  • Meprim
  • Metipine
  • Monotrim
  • Motrim
  • Proloprim
  • Trimpex
  • Triprim
Affected Organism
  • Gram negative and gram positive bacteria
  • Listeria monocytogenes
  • Escherichia coli
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
  • intravenous
  • ophthalmic
  • oral
  • Anti-Infective Agents
  • CYP2C8 Inhibitors (Moderate)
ATC-Code J01EA01
AHFS-Code 08:36.00
CAS number 738-70-5
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID: 21059682