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Family Physician
Family Physician, Doctor
Category: Medical
Satisfied Customers: 12816
Experience:  Emergency Medicine and Family Practice for over 26 years
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can taking a 1000mg of metformin daily cause a false positive

Customer Question

can taking a 1000mg of metformin daily cause a false positive on a alcohol drug test?
Submitted: 6 years ago.
Category: Medical
Expert:  Doc,M.D. replied 6 years ago.

It is generally recommended that people not use metformin and alcohol at the same time. Taking metformin and alcohol together can increase your risk of developing a life-threatening condition called lactic acidosis. However, drinking small amounts of alcohol should not be a problem for most people taking the medication. There is no risk of a false positive alcohol test due to metformin however. Hope this helps

Expert:  Family Physician replied 6 years ago.
As the other expert stated, the metformin itself would NOT cause a false positive for alcohol.

HOWEVER, if the alcohol test was done on urine, there are published reports of diabetic patients having false positive urine alcohol tests (or false positive urine EtG tests) because of fermentation of glucose (sugar) in the urine in the setting a bacteria or yeast in the urine.
Family Physician, Doctor
Category: Medical
Satisfied Customers: 12816
Experience: Emergency Medicine and Family Practice for over 26 years
Family Physician and 6 other Medical Specialists are ready to help you
Customer: replied 6 years ago.

can the combination of the following drugs cause a false positive drug test for alcohol:

Lisinopril, Fluoxetine,Simvastatin, Isosorb, Metformin, Atenol, Amlodipine and insulin?

Expert:  Family Physician replied 6 years ago.
None of these medication (alone or in combination) would cause a false positive blood alcohol test.

There are however some reports of production of trace amounts of alcohol in urine when there are elevated levels of glucose (such as in diabetes) and bacteria/yeast infections. If the test was performed on urine, this is theoretically possible.
Customer: replied 6 years ago.

 

what if you added promethazine to the mix?

 

 

 

Expert:  Family Physician replied 6 years ago.
Promethazine would not cause a false positive blood alcohol if added to the medication you listed.