Not exactly: If you have a moderate degree of renal disease, metformin can cause lactic acidosis, which is very serious. If you do not have renal disease, metformin is quite safe.
Answered 5/13/2014
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No: Metformin is not known to be toxic to the kidneys. The concern may be when a patient has naturally kidney function and they take metformin. That person may then be at (rare, but still documented) risk of a condition called lactic acidosis - a potentially dangerous, body-wide build-up of lactic acid that interferes with the delivery with oxygen.
Answered 4/8/2018
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