Diabetes Home > Metformin Warnings and Precautions
Some metformin warnings and precautions relate to monitoring your liver function while taking metformin, the possibility of the medication decreasing your B12 levels, and the potential for metformin to cause low blood sugar. Prior to taking metformin, you should talk to your healthcare provider about any health conditions you might have, such as kidney or liver problems, congestive heart failure, or low vitamin B12 levels.
Metformin: What Should I Tell My Healthcare Provider?Prior to taking metformin (Glucophage®) or metformin ER (Glucophage XR®), you should talk with your healthcare provider if you have:
- Kidney problems, including kidney failure (renal failure)
- Liver problems, including liver failure or cirrhosis
- Low vitamin B12 levels (pernicious anemia)
- Congestive heart failure (CHF)
- Had a heart attack or stroke
- An upcoming surgery or procedure (including x-rays or other radiology procedures)
- Any allergies, including allergies to foods, dyes, or preservatives.
- Are pregnant or thinking of becoming pregnant
- Are breastfeeding
- Drink alcohol regularly.