Depends on musculature of the patient
Each patient has to be assessed and the musculature evaluated. For instance, men need nearly twice as many units as women. However, there are numerous women who need more than the standard number of units.
Some physicians, including myself, distribute the 20-25 units of BOTOX and 50 units of Dysport in five points around the glabella areas, some prefer three areas.
Follow-up is key, since, if there is still a line remaining in the glabella area it can be erased with more units.