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“The protecting agents employed, thymidine and inosine , circumvent the antipurine and antipyrimidine effects of MTX , but neither agent inhibits the transport or the polyglutamylation of MTX.”
“However, the diminishing effect on survival with thymidine and inosine doses above 0.5 mg/hr indicated loss of the antitumor effect of methotrexate.”
“It is concluded that co-administration of inosine and/or thymidine allows the use of methotrexate doses otherwise not tolerated, though with loss of anti-tumor effect.”