Oral Medications
Biguanides:

Biguanides include the drug Metformin.

How it helps
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In the liver, Metformin prevents the production of sugar. 

In the blood, Metformin allows your cells to take sugar out of your blood more easily.

In the intestines, Metformin prevents the absorption of sugar. 

What to watch for

Metformin may upset your stomach. If this happens, take your medication with food.