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Intrathecal methotrexate

Intrathecal methotrexate is a chemotherapy drug which is given to prevent leukaemia cells entering the cerebrospinal fluid (CSF) around the spine and brain. This drug is also used to treat leukaemia found in the CSF. This page from Great Ormond Street Hospital (GOSH) describes intrathecal methotrexate, how it is given and some of the possible side effects.