In some cases, the forehead can be over-treated or treated too low (too close to the brows) and the brows feel heavy. The first step to treat this is to make sure the glabellar area is frozen (more on this below). If the glabella is frozen and the brows are still heavy then unfortunately you will just have to wait this one out. The good news is that this area usually loosens up after a few weeks. If the glabella is still active, or wasn't treated at all (big mistake) then this might be an easy fix.