sulfamethoxazole and Daraprim Interactions

Interactions between sulfamethoxazole and Daraprim (pyrimethamine)

sulfamethoxazole and pyrimethamine (Moderate Drug-Drug)

MONITOR: Coadministration of pyrimethamine in doses exceeding 25 mg per week with trimethoprim or sulfonamides may increase the risk of megaloblastic anemia and pancytopenia. The proposed mechanism is additive antifolate effects.

MANAGEMENT: Periodic clinical and laboratory monitoring for signs of folic acid deficiency and hematologic changes is advisable.