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Hello this is Dr. Salama MD,
The general rule is that metformin is typically good for 2 years.
I wouldn't take any tonight especially if you'll be going in tomorrow morning for a new prescription.
Let me know if you have any other questions.
If not, please don't forget to leave a positive rating as that's the only way I get credit for answering your question.
Checking in. Is there anything else I can help you with today?