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Can taking a 1000mg of metformin daily cause a false

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positive on a alcohol drug...
can taking a 1000mg of metformin daily cause a false positive on a alcohol drug test?
Submitted: 7 years ago.Category: Medical
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Answered in 29 minutes by:
11/7/2010
Doctor: Doc,M.D., Doctor replied 7 years ago
Doc,M.D.
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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

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Doctor: Family Physician, Doctor replied 7 years ago
Family Physician
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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.
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Customer reply replied 7 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?

Doctor: Family Physician, Doctor replied 7 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.
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Customer reply replied 7 years ago

what if you added promethazine to the mix?

Doctor: Family Physician, Doctor replied 7 years ago
Promethazine would not cause a false positive blood alcohol if added to the medication you listed.
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