Can It Take Longer for Botox to Work in Certain Places in Your Forehead?

Dear teetee9,  Everyone starts with asymmetric eyebrow position and movement.  Even with ideal injections, it's common for one brow to move more that the other.  usually you will see the maximal effect by 2 weeks.  at that point you can return to your doctor to evaluate the movement and symmetry and you might need a tiny dose to relax the remaining moving muscle.   No need to worry.  Best of luck

Botox and other neuromodulators can take up to two weeks to work.  I wouldn’t worry and the unevenness is something that usually does even out within that amount of time.  If after 2 weeks you are still concerned with the result then I would follow up with your treating provider.

Some muscle areas may be affected sooner than others.  With Botox, you will begin to notice an effect in 1-2 days, and see the full effect in approximately 7 days.  If you still notice asymmetry at that time, it's always possible to improve this with a little touch-up.