Call your doctor. Since your doctor prescribed the Metformin he/she will provide you with instructions on how to prepare for your test.
At what time should I take metformin the day before an glucose tolerance exam?
by cookieN, Feb 13, 2011 05:02PM
The thing is that my doctor is measuring my glucose control with medication and medication effectiveness. What I want is to know what my real numbers are without the aid of the medication.
This, because I´ve noticed that the past week I´ve been getting glucose numbers around 70 two hours after meals (with medication). Since they are fine or low, could that mean I do not need the medication?
Metformin has an elimination half-life of approximately 17.6 hours. It is not metabolized, but secreted in the urine.
It takes approximately 5.5 x elimination half life's for a medicine to be cleared from your system, therefore it'll be in your system for that long.
So Metformin will be in your system for 96.8 hours i.e. 4 days (5.5 x 17.6 hours).
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You must first call your doctor and inform him/her of your intentions to halt Metformin to test you glucose "clean". Stopping without doing so is inadvisable.
I will comment on insulin testing in your other post.
This is what I got from what I read.
a. Half life of metformin is 17.6 hours
b. Metformin is cleared from system in 4 days.
What I don´t understand is how many hours before should I take metformin for it not to effect/vary my blood tests results?
Should I stop taking it 17,6 hours before, or stop taking it 4 days before.
The fact that metformin stays in system for 4 days, does that mean that metformin is still effective????
THANK YOU so much for your detailed response. It is very useful.
You're welcome. Glad to be of help.