Forteo and weight gain

A friend's mother who is 90+ was recently started on Forteo. Her mother is extremely petite, probably not weighing even 110. She is active, drives, travels, etc. The friend says her mother has started gaining weight for no apparent reason. She asked me if weight gain was a side effect of Forteo. I recently finished my two year cycle (in February of this year) and have lost about 20 lbs. (even though I was not overweight) and have been thrilled about it. Nothing much has changed in my lifestyle (I am a fanatic exerciser, eat healthily, and have been, for my entire life, trying to lose about "20 lbs." Now it came off after finishing the Forteo.

Has anyone else found this to be their pattern as well, either on or off of Forteo.