My wife had lactation as a medication side effect and it made her breasts very painful. **Extra TMI warning, but she did get some relief from manually expressing the milk once per day, and also from wearing very tight sports bras because they reduced any jiggling. She discontinued the medication due to many negative side effects including this. Lactation aloneis justification to change meds usually, but if you are otherwise happy with the meds effects, hopefully you can find ways to tolerate it.