Thong Y H, Ferrante A
Clin Exp Immunol. 1980 Jan;39(1):190-4.
Pyrimethamine, a 2,4-diaminopyrimidine useful in the treatment of malaria and toxoplasmosis, was found to enhance antibody and delayed-type hypersensitivity responses to sheep red cells in mice. The immunodepression of tumour-bearing mice was also reversed by pyrimethamine. This drug may prove useful as a general immunostimulant in clinical situations where the immune system has been compromised by cancer or other debilitating illnesses.