What are the possible side effects of metformin?

What are the possible side effects of metformin?
Yahoo Health

Get emergency medical help if you have any of these symptoms of lactic acidosis: weakness, increasing sleepiness, slow heart rate, cold feeling, muscle pain, shortness of breath, stomach pain, feeling light-headed, and fainting.

Stop using metformin and get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

* feeling short of breath, even with mild exertion;
* swelling or rapid weight gain; or
* fever, chills, body aches, flu symptoms.

Less serious side effects may include:

* headache or muscle pain;
* weakness; or
* mild nausesa, vomiting, diarrhea, gas, stomach pain.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

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