Changing medication

My wife is just about to change her medication to levodopa sinemet and she is very worried of the side affects  of this tablet  is there many side affects with this 

hi can have nausea when first start but can have domperidone and that stops it , also headache but if drink plenty thats stops . took a couple days to get use to each increase then fine . 

the benifits outway any side effect ... took a couple of weeks till got to correct dose but then feel so much better and stiffness gone