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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Blurred Vision After Taking Metformin For Diabetes?

Iam a student at Everest college and Iam looking up meds but I do have one big question about something that happened to me tonite . I hve been diagnosed as a diabetic and Iam taking metformin twice a day 500mg my sugar dropped while I was in class tonite my vision went blurry for about 10-15 min. Im wondering if I should not take the metformin tonite when I took my sugar after eating a hr after the initial onset of symptoms it was129 .
Mon, 8 Jun 2015
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General & Family Physician,  's  Response
Hi,
Blurred vision is most likely due to low glucose levels in blood (hypoglycemia)
Metformin never causes hypoglycemia (unless taken in toxic amounts) as its mechanism of action is different. It enhances the peripheral utilisation of glucose i.e causes muscles and fat cells to use up the available glucose in blood unlike the other drugs that cause insulin like action. Are you taking any other drugs / insulin along with Metformin?
Metformin therefore cannot be the cause of your hypoglycemia unless you were hiked up on the dose at that particular time of hypoglycemia episode. (even this is rare). If that is not the case continue metformin,or else consult your treating physican.
And your last statement is unclear "when I took my sugar after eating a hr after the initial onset of symptoms it was 129".
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What Causes Blurred Vision After Taking Metformin For Diabetes?

Hi, Blurred vision is most likely due to low glucose levels in blood (hypoglycemia) Metformin never causes hypoglycemia (unless taken in toxic amounts) as its mechanism of action is different. It enhances the peripheral utilisation of glucose i.e causes muscles and fat cells to use up the available glucose in blood unlike the other drugs that cause insulin like action. Are you taking any other drugs / insulin along with Metformin? Metformin therefore cannot be the cause of your hypoglycemia unless you were hiked up on the dose at that particular time of hypoglycemia episode. (even this is rare). If that is not the case continue metformin,or else consult your treating physican. And your last statement is unclear when I took my sugar after eating a hr after the initial onset of symptoms it was 129 .