Puritan symptoms and conditions

My mother started on Lipator about a year ago, she's been having shakes that last about 30 seconds in her legs and one arm. The shakes come and go and she can go a month without them but they seem to have gotten worst. She also has a hard time walking 4 out of days a week, she feels like her legs aren't under her. She is always tired and has restless leg,sometimes at night. She has respiratory problem that also seems to have gotten worst in the past year.
She is seeing a nuro but a cat scan, eeg and blood have all come back ok. Do you thing these are common problems with Lipator?