Probably this wouldn't happen to a younger person, but when you're taking an awful lot of metformin/glucophage, it can cause musicle pain, and even a LACTIC ACIDOSIS which can be fatal.

My arm muscles, mostly biceps but it was spreading to other parts of the body, were unbearably painful, even when taking a muscle relaxant, methocarbamol, because he assumed it was just pulled muscles/worn rotator cuff/shoulder/bursitis and like that.

Yup I'm always been hypothyroid, taking levothroid, was on 5 pills a day of the metformin/glucophage, almost 3000 mg I guess, besides some other diabetes meds, glyset and glucatrol10XL. Atkins really helps. I love it.

Also raw green beans help, just a few, if you're way out of control in spite of everything and trying to wait for your next appointment, having to start a new med very slowly in case of a reaction, and lots of water/anti-oxidants to flush out buildups of whatever. Anyone know anything about Actos?

Metformin/glucophage arm pain stops within 5-days to a week, if you've hit on the right cause. I took one more to make sure, and had awful pain again for 5 days just from one pill. Had taken glucophage for years, and it helps you lose weight, but so does Atkins.

Good luck, everyone.