Pyrimethamine

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What is Pyrimethamine?

Pyrimethamine is a prescription antiparasitic medication used to treat toxoplasmosis—a serious infection caused by the parasite Toxoplasma gondii—typically in combination with a sulfonamide antibiotic. It's particularly critical for immunocompromised patients, including those with HIV/AIDS, organ transplant recipients, and pregnant women, in whom toxoplasmosis can cause severe neurological disease. Pyrimethamine works by blocking an enzyme the parasite needs to produce folate, which is essential for its DNA synthesis and replication. Because it also affects human folate metabolism, leucovorin (folinic acid) is co-administered to prevent bone marrow suppression.

Dihydrofolate reductase inhibition

Selectively blocks the parasite's dihydrofolate reductase enzyme at much lower concentrations than the human equivalent, preventing Toxoplasma gondii from synthesizing the folate needed for DNA replication and cell division.

Combination regimen cornerstone

Used alongside sulfadiazine or clindamycin, which block an earlier step in the same folate synthesis pathway—the combination creates synergistic antiparasitic activity that is far more effective than either drug alone.

Leucovorin co-administration

Pyrimethamine's folate pathway inhibition affects human bone marrow cells as well as the parasite—leucovorin (folinic acid) is given concurrently to bypass this blockade in human cells and prevent the anemia and neutropenia that would otherwise result.

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