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Targeting metabolic reprogramming to treat cancer could increase overall survival and reduce side effects. Here, we put forward a strategy using arene‐ruthenium(II)/osmium(II) complexes to potentiate the anticancer effect of metformin (Met.) via glucose metabolism reprogramming. Complexes 1–6 with oxoglaucine derivatives as ligands were synthesized and their anti‐tumor activities were tested under hypoglycemia. Results indicated that 2 and 5 potentiated the anticancer effects of Met. under hypoglycemia, exhibiting lower toxicity, slower blood glucose decline and inhibition of early tumor liver metastasis. Combination of 5 with Met. could be used as a new strategy to treat cancer under hypoglycemia through glucose metabolism reprogramming. [ABSTRACT FROM AUTHOR]