Molecular Weight(MW): 248.71
Pyrimethamine is a dihydrofolate reductase (DHFR) inhibitor, used as an antimalarial drug.
Purity & Quality Control
Choose Selective DHFR Inhibitors
|Description||Pyrimethamine is a dihydrofolate reductase (DHFR) inhibitor, used as an antimalarial drug.|
Pyrimethamine has an IC50 of 5–13 μM for the Hex isozymes at pH 4.3. Pyrimethamine increases the enzyme activity and protein level of the α and β subunits of Hex A in the βR505Q/Δ16kb cell line.  Pyrimethamine-sulfadoxine is an inhibitor of dihydrofolate reductase(DHFR) that has been widely used to treat chloroquine-resistant Plasmodium falciparum malaria.  Pyrimethamine is a potent inhibitor of mouse (m)Mate1 (K(i) = 145 nM) among renal organic cation transporters mOctn1 and mOctn2 (K(i) > 30 mM), mOct1 (K(i) = 3.6 mM), and mOct2 (K(i) = 6.0 mM). Pyrimethamine inhibits the uptake of metformin by kidney brush-border membrane vesicles (BBMVs) (K(i) = 41 nM) and canalicular membrane vesicles in the presence of outward gradient of H+. Pyrimethamine treatment significantly increases the kidney-to-plasma ratio of tetraethylammonium, and both the liver- and kidney-to-plasma ratios of metformin in mice, whereas it does not affect their plasma concentrations and urinary excretion rates. Pyrimethamine is a potent inhibitor of human (h)MATE1 and hMATE2-K (K(i) = 77 and 46 nM, respectively) and H+ and organic cation exchanger in human kidney BBMVs (K(i) = 31 nM) in the presence of outward gradient of H+. 
|In vitro||DMSO||10 mg/mL (40.2 mM)|
* 1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
Calculate the mass, volume or concentration required for a solution. The Selleck molarity calculator is based on the following equation:
Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)
*When preparing stock solutions, please always use the batch-specific molecular weight of the product found on the via label and MSDS / COA (available on product pages).
Calculate the dilution required to prepare a stock solution. The Selleck dilution calculator is based on the following equation:
Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
This equation is commonly abbreviated as: C1V1 = C2V2 ( Input Output )
* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
Molecular Weight Calculator
Enter the chemical formula of a compound to calculate its molar mass and elemental composition:
Tip: Chemical formula is case sensitive. C10H16N2O2 c10h16n2o2
Instructions to calculate molar mass (molecular weight) of a chemical compound:
To calculate molar mass of a chemical compound, please enter its chemical formula and click 'Calculate'.
Definitions of molecular mass, molecular weight, molar mass and molar weight:
Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT02511054||Completed||Malaria||National Institute of Allergy and Infectious Diseases (NIAID)|National Institutes of Health Clinical Center (CC)||July 21, 2015||Phase 1|
|NCT03009526||Not yet recruiting||Malaria|Pregnancy||University of Malawi College of Medicine|Centers for Disease Control and Prevention||January 2017||Phase 3|
|NCT02909712||Recruiting||Malaria|Pregnancy|Cardiotoxicity|Parasitemia||London School of Hygiene and Tropical Medicine|Kilimanjaro Christian Medical Centre, Tanzania|National Institute for Medical Research, Tanzania||September 2016||Phase 2|
|NCT02793622||Recruiting||Malaria||University of California, San Francisco|Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)|Bill and Melinda Gates Foundation||September 2016||Phase 3|
|NCT02831023||Completed||Malaria||University of California, San Francisco|Malaria Research and Training Center, Bamako, Mali|Radboud University|London School of Hygiene and Tropical Medicine|Heidelberg University|Bill and Melinda Gates Foundation||July 2016||Phase 2|
|NCT02836002||Recruiting||Malaria||Radboud University|The PATH Malaria Vaccine Initiative (MVI)|QIMR Berghofer Medical Research Institute||June 2016||Phase 1|Phase 2|
Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.
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