| methotrexate | <drug> Analogue of dihydrofolate. Inhibits dihydrofolate reductase and kills rapidly growing cells. Therapeutic agent for leukaemias, but has a low therapeutic ratio. (18 Nov 1997) |
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| TAB vaccine | A suspension of killed typhoid and paratyphoid A and B bacilli. See: typhoid vaccine. Synonym: TAB vaccine. (05 Mar 2000) |