Abstract

Abstract The metabolism of cyclophosphamide was determined before and following treatment with methotrexate. After 9 days treatment to 7 patients with methotrexate 7.5 mg/day by mouth the rate of bio‐transformation of cyclophosphamide was decreased in 2 cases, increased in 1 case and unchanged in 5 cases. After the intravenous injection of 40 mg methotrexate to 2 subjects the biotransformation of cyclophosphamide is immediately inhibited. It is argued that the inconsistency of the results after prolonged treatment with methotrexate may be due to individual variations with regard to sensitivity of the drug metabolizing enzymes to methotrexate, whereas the acute effect is probably due to an inhibition of the action of the enzymes.

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