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| ECHA InfoCard | 100.017.732 | 
| Chemical and physical data | |
| Formula | C12H14N4O4S | 
| Molar mass | 310.33 g·mol−1 | 
| 3D model (JSmol) | |
| Melting point | 190 to 194 °C (374 to 381 °F) | 
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Sulfadoxine (also spelled sulphadoxine) is an ultra-long-lasting sulfonamide used in combination with pyrimethamine to treat malaria. [1]
It is also used to prevent malaria [2] but due to high levels of sulphadoxine-pyrimethamine resistance, this use has become less common. [3]
It is also used, usually in combination with other drugs, to treat or prevent various infections in livestock.[ citation needed ]
Sulfadoxine competitively inhibits dihydropteroate synthase, interfering with folate synthesis.[ citation needed ]