One session lasts three to four months. While the muscles pulling the brow down are weakened, the lifting muscles become relatively stronger and the raised look holds. When the drug wears off the downward pull returns, so it is repeated, and it is often planned together with forehead-line treatment.

If the muscles differ in strength between the two sides, the heights can end up uneven. Almost everyone is slightly asymmetric, so the same dose produces a different response on each side. For that reason the first pass is conservative; the result is reviewed at about two weeks and a small top-up is added on one side if needed.

The brow lifts over one to two weeks. It adjusts the pull of the muscle rather than reducing its volume, so change is felt faster than with jaw or trapezius treatment, where you wait for volume to shrink. If the forehead was treated at the same time, the smoothing of forehead lines lands on a similar schedule.