Best form of management is the avoid brow ptosis happening
Good patient selection, if you feel they may be at high risk due to their anatomy or age for example, explain this and avoid treatment completely, as already explained above these can be categorised into 4 criteria; Hyperdynamic forehead, a bulky, wide or full looking glabella, skin that flows directly and uninterrupted to the eyelashes and finally loose puffy skin over the lids.
It is advised to allow space of 2cms upwards for the orbital rim, for injection points into the frontalis muscle, the lower portion being the highest risk factor for brow ptosis. The lower 3rd of the muscle should therefore be avoided entirely. This will allow the aesthetic of a slightly lifted brow while still eliminating most lines.
Generally speaking, the desired treatment outcome is usually to lift the brow through the use of toxin, hence why the side effect of brow ptosis on women particularly should be avoided at all costs.