Pyrimethamine, also known as immortal, darapirin, is a broad-spectrum veterinary drug widely used for antiprotozoal. In addition, pyrimethamine is also used in aquatic products to enhance the disease resistance of aquatic fish. However, the side effects of pyrimethamine are relatively large. Excessive use can damage the reproductive system of livestock and poultry and is not easy to recover. Pyrimethamine has an inhibitory effect on the primary infrared stage of certain falciparum malaria and vivax malaria, and is a better preventive medicine. Although it has no obvious effect on the gametophytes of malaria parasites, the drug-containing blood enters the mosquitoes, which can affect the development of the gametophytes in the mosquitoes, so it can block transmission.

Used for pesticides and reagents for analysis.

Used as strong basic catalyst, ethoxylating agent and as reductant for organic synthesis, pharmaceutical synthesis, etc.

Used in medicine industry, such as phenylbutazone, methyldopa, hydrochloride, aminopterin, pyrimethamine, pifu ampicillin and so on.

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